From ca6daa582cdfefebdaf7d2dba0f63e658d505bf4 Mon Sep 17 00:00:00 2001
From: rogerwang2008 <rogerwang2008@163.com>
Date: Fri, 9 Oct 2026 10:21:51 +0800
Subject: [PATCH] some programs!!!

---
 .idea/workspace.xml                           | 749 ++++++++++--------
 CMakeLists.txt                                |   2 +
 _others/others_test.c                         |  21 +
 _others/others_test.c.cpp                     |  50 --
 _others/others_test_cpp.cpp                   |  29 +
 cs101/{ => stage_1}/dh_01_01.cpp              |   0
 cs101/{ => stage_1}/dh_01_02_subway.cpp       |   0
 cs101/{ => stage_1}/dh_01_03.cpp              |   0
 cs101/{ => stage_1}/dh_01_04.cpp              |   0
 cs101/{ => stage_1}/dh_01_05_vote.cpp         |   0
 cs101/{ => stage_1}/dh_03_01_bike_or_walk.cpp |   0
 .../dh_03_02_draw_rectangles.cpp              |   0
 cs101/{ => stage_1}/dh_03_03.cpp              |   0
 cs101/{ => stage_1}/dh_03_04_lamps.cpp        |   0
 .../{ => stage_1}/dh_03_05_perfect_cubes.cpp  |   0
 cs101/{ => stage_1}/dh_04_01_fibonacci.cpp    |   0
 .../dh_04_04_balloons.cpp}                    |   0
 .../{ => stage_1}/dh_04_04_balloons_init1.py  |   0
 cs101/stage_1/dh_05_01_newton_sqrt.cpp        |  29 +
 cs101/stage_1/dh_05_02_three_nums.cpp         |  42 +
 cs101/stage_1/dh_05_03_different_num.cpp      |  18 +
 cs101/stage_1/dh_05_04_fried_chicken.cpp      |  18 +
 cs101/stage_1/dh_05_05_pair_of_shit_nums.cpp  |  28 +
 .../dh_05_05_pair_of_shit_nums_ANALYSIS.cpp   | 137 ++++
 .../dh_05_05_pair_of_shit_nums_SIEVE.cpp      |  68 ++
 cs101/stage_1/dh_06_02_convex_polygon.cpp     |  67 ++
 cs101/stage_1/dh_06_04_split.cpp              |  46 ++
 cs101/stage_2/dh_11_01_change.cpp             |  48 ++
 cs101/stage_2/dh_11_02_shit_num.cpp           |  37 +
 cs101/stage_2/dh_11_03_jump_rope.cpp          |  32 +
 .../dh_00_05_sum_fractions.cpp                |   0
 .../dh_00_10_smaller_numbers.cpp              |   0
 .../dh_00_11_count_digits_init.py             |   0
 .../dh_00_12_bottle_exchange.cpp              |   0
 cs101/{ => stage_pre}/dh_00_13_flip.cpp       |   0
 cs101/{ => stage_pre}/dh_00_14_encryption.cpp |   0
 cs101/{ => stage_pre}/dh_00_15_jusephus.cpp   |   0
 cs101/{ => stage_pre}/dh_00_16_swap_bits.cpp  |   0
 dp/eagle_egg.cpp                              |  52 ++
 dsa/ch2_linear_list/P2629_good_news.cpp       |  60 ++
 dsa/ch2_linear_list/SDOI2007_queue.cpp        | 117 +++
 dsa/ch3_stack_queue/USACO12MARs_flowerpot.cpp |  96 +++
 .../USACO12MARs_flowerpot_WRONG.cpp           |  87 ++
 43 files changed, 1452 insertions(+), 381 deletions(-)
 create mode 100644 _others/others_test.c
 delete mode 100644 _others/others_test.c.cpp
 create mode 100644 _others/others_test_cpp.cpp
 rename cs101/{ => stage_1}/dh_01_01.cpp (100%)
 rename cs101/{ => stage_1}/dh_01_02_subway.cpp (100%)
 rename cs101/{ => stage_1}/dh_01_03.cpp (100%)
 rename cs101/{ => stage_1}/dh_01_04.cpp (100%)
 rename cs101/{ => stage_1}/dh_01_05_vote.cpp (100%)
 rename cs101/{ => stage_1}/dh_03_01_bike_or_walk.cpp (100%)
 rename cs101/{ => stage_1}/dh_03_02_draw_rectangles.cpp (100%)
 rename cs101/{ => stage_1}/dh_03_03.cpp (100%)
 rename cs101/{ => stage_1}/dh_03_04_lamps.cpp (100%)
 rename cs101/{ => stage_1}/dh_03_05_perfect_cubes.cpp (100%)
 rename cs101/{ => stage_1}/dh_04_01_fibonacci.cpp (100%)
 rename cs101/{sh_04_04_balloons.cpp => stage_1/dh_04_04_balloons.cpp} (100%)
 rename cs101/{ => stage_1}/dh_04_04_balloons_init1.py (100%)
 create mode 100644 cs101/stage_1/dh_05_01_newton_sqrt.cpp
 create mode 100644 cs101/stage_1/dh_05_02_three_nums.cpp
 create mode 100644 cs101/stage_1/dh_05_03_different_num.cpp
 create mode 100644 cs101/stage_1/dh_05_04_fried_chicken.cpp
 create mode 100644 cs101/stage_1/dh_05_05_pair_of_shit_nums.cpp
 create mode 100644 cs101/stage_1/dh_05_05_pair_of_shit_nums_ANALYSIS.cpp
 create mode 100644 cs101/stage_1/dh_05_05_pair_of_shit_nums_SIEVE.cpp
 create mode 100644 cs101/stage_1/dh_06_02_convex_polygon.cpp
 create mode 100644 cs101/stage_1/dh_06_04_split.cpp
 create mode 100644 cs101/stage_2/dh_11_01_change.cpp
 create mode 100644 cs101/stage_2/dh_11_02_shit_num.cpp
 create mode 100644 cs101/stage_2/dh_11_03_jump_rope.cpp
 rename cs101/{ => stage_pre}/dh_00_05_sum_fractions.cpp (100%)
 rename cs101/{ => stage_pre}/dh_00_10_smaller_numbers.cpp (100%)
 rename cs101/{ => stage_pre}/dh_00_11_count_digits_init.py (100%)
 rename cs101/{ => stage_pre}/dh_00_12_bottle_exchange.cpp (100%)
 rename cs101/{ => stage_pre}/dh_00_13_flip.cpp (100%)
 rename cs101/{ => stage_pre}/dh_00_14_encryption.cpp (100%)
 rename cs101/{ => stage_pre}/dh_00_15_jusephus.cpp (100%)
 rename cs101/{ => stage_pre}/dh_00_16_swap_bits.cpp (100%)
 create mode 100644 dp/eagle_egg.cpp
 create mode 100644 dsa/ch2_linear_list/P2629_good_news.cpp
 create mode 100644 dsa/ch2_linear_list/SDOI2007_queue.cpp
 create mode 100644 dsa/ch3_stack_queue/USACO12MARs_flowerpot.cpp
 create mode 100644 dsa/ch3_stack_queue/USACO12MARs_flowerpot_WRONG.cpp

diff --git a/.idea/workspace.xml b/.idea/workspace.xml
index 68352ba..1034548 100644
--- a/.idea/workspace.xml
+++ b/.idea/workspace.xml
@@ -4,7 +4,8 @@
     <option name="autoReloadType" value="SELECTIVE" />
   </component>
   <component name="BackendCodeEditorMiscSettings">
-    <option name="/Default/Environment/Hierarchy/GeneratedFilesCacheKey/Timestamp/@EntryValue" value="3" type="long" />
+    <option name="/Default/Environment/Hierarchy/GeneratedFilesCacheKey/Timestamp/@EntryValue" value="4" type="long" />
+    <option name="/Default/Environment/UserInterface/HierarchyView/ViewStyle/@EntryValue" value="SuperTypes" type="string" />
     <option name="/Default/Housekeeping/FeatureSuggestion/FeatureSuggestionManager/DisabledSuggesters/=SwitchToGoToActionSuggester/@EntryIndexedValue" value="true" type="bool" />
     <option name="/Default/Housekeeping/LiveTemplatesHousekeeping/HotspotSessionHintIsShown/@EntryValue" value="true" type="bool" />
     <option name="/Default/Housekeeping/OptionsDialog/SelectedPageId/@EntryValue" value="RiderCppLiveTemplatesSettings" type="string" />
@@ -20,141 +21,164 @@
   </component>
   <component name="CMakeRunConfigurationManager">
     <generated>
-      <config projectName="exercises" targetName="cs101__dh_20260923_01_bike_or_walk" />
-      <config projectName="exercises" targetName="pojcs101_M02692_12_coins" />
-      <config projectName="exercises" targetName="graph__ECNA2001_sort_letters" />
       <config projectName="exercises" targetName="dsa__ch2_linear_list__dsa_0205_polynomial_addition" />
-      <config projectName="exercises" targetName="pojcs101_T12559_biggest_smallest_combination" />
+      <config projectName="exercises" targetName="cs101__stage_2__dh_11_03_jump_rope" />
       <config projectName="exercises" targetName="pojcs101_T12559_biggest_smallest_combination_WRONG" />
-      <config projectName="exercises" targetName="pojcs101_E02883" />
-      <config projectName="exercises" targetName="dsa__ch2_linear_list__dsa_0217_magic_square" />
+      <config projectName="exercises" targetName="cs101__stage_1__dh_05_02_three_nums" />
       <config projectName="exercises" targetName="pojcs101_M02694_polish_notation_tree" />
       <config projectName="exercises" targetName="pojcs101_M01017_6_boxes" />
-      <config projectName="exercises" targetName="cs101__dh_20260917_03" />
-      <config projectName="exercises" targetName="dp__backpack_dp__NOIP2005J_herbs_dp_knapsack_MWASTE" />
-      <config projectName="exercises" targetName="dp__backpack_dp__NOIP2006S_jinming_budget_dp_knapsack" />
-      <config projectName="exercises" targetName="cs101__dh_20260923_03" />
-      <config projectName="exercises" targetName="dp__backpack_dp__NOIP2005J_herbs_dp_knapsack_PINGPONG" />
-      <config projectName="exercises" targetName="cs101__dh_20260923_04_lamps" />
-      <config projectName="exercises" targetName="JLOI2009_binary_tree_GIVEUP" />
-      <config projectName="exercises" targetName="dsa__ch3_stack_queue__dsa_0306_stack_operation" />
-      <config projectName="exercises" targetName="cs101__dh_20260909_16_swap_bits" />
-      <config projectName="exercises" targetName="pojcs101_M03704_brackets" />
+      <config projectName="exercises" targetName="cs101__stage_1__dh_05_05_pair_of_shit_nums_SIEVE" />
       <config projectName="exercises" targetName="dsa__ch3_stack_queue__dsa_0301_sliding_window_SLOW" />
       <config projectName="exercises" targetName="luogu_ez_B3628" />
       <config projectName="exercises" targetName="dp__TJOI2007_walk_segments_dp" />
-      <config projectName="exercises" targetName="pojcs101_M03441_sum_zero" />
-      <config projectName="exercises" targetName="pojcs101_M01328_radar_greedy" />
       <config projectName="exercises" targetName="pojcs101_M02692_12_coins_WRONG" />
-      <config projectName="exercises" targetName="pojcs101_M02746_josephus_problem_simulation" />
       <config projectName="exercises" targetName="pojcs101_M02039_snakey_encryption" />
       <config projectName="exercises" targetName="cmake-build-debug-gcc__CMakeFiles__4.3.1__CompilerIdC__CMakeCCompilerId" />
+      <config projectName="exercises" targetName="cs101__stage_pre__dh_00_13_flip" />
       <config projectName="exercises" targetName="graph__luogu_P3916_graph_iteration" />
+      <config projectName="exercises" targetName="cs101__stage_1__dh_03_02_draw_rectangles" />
       <config projectName="exercises" targetName="_others__jzh__jzh_c1_h" />
       <config projectName="exercises" targetName="dp__NOIP1996S_miner_dp_MWASTE" />
-      <config projectName="exercises" targetName="dsa__ch2_linear_list__dsa_0204_prefix_cycle" />
       <config projectName="exercises" targetName="pojcs101_T01011_sticks" />
-      <config projectName="exercises" targetName="cs101__dh_20260909_15_jusephus" />
       <config projectName="exercises" targetName="pojcs101_M02431_cows_gas_leak_WRONG" />
+      <config projectName="exercises" targetName="cs101__stage_1__dh_05_03_different_num" />
+      <config projectName="exercises" targetName="luogu_P1160_biodir_linked_list" />
+      <config projectName="exercises" targetName="pojcs101_E01003" />
+      <config projectName="exercises" targetName="JLOI2009_binary_tree" />
+      <config projectName="exercises" targetName="dsa__ch2_linear_list__dsa_0206_binary_query" />
+      <config projectName="exercises" targetName="dsa__ch2_linear_list__dsa_0203_string_insertion" />
+      <config projectName="exercises" targetName="cs101__stage_pre__dh_00_16_swap_bits" />
+      <config projectName="exercises" targetName="pojcs101_T27373_biggest_combination_t2_TLE" />
+      <config projectName="exercises" targetName="pojcs101_M02524_ubiquitous_religions_dsu" />
+      <config projectName="exercises" targetName="cs101__stage_pre__dh_00_15_jusephus" />
+      <config projectName="exercises" targetName="exercises" />
+      <config projectName="exercises" targetName="dp__SHOI2002_ski_dp" />
+      <config projectName="exercises" targetName="pojcs101_M01852_ants_falling" />
+      <config projectName="exercises" targetName="cs101__stage_1__dh_01_04" />
+      <config projectName="exercises" targetName="cs101__stage_1__dh_06_04_split" />
+      <config projectName="exercises" targetName="dsa__ch2_linear_list__P2629_good_news" />
+      <config projectName="exercises" targetName="cs101__stage_1__dh_03_04_lamps" />
+      <config projectName="exercises" targetName="cs101__stage_1__dh_03_03" />
+      <config projectName="exercises" targetName="dsa__ch3_stack_queue__dsa_0302_calculator_WRONG" />
+      <config projectName="exercises" targetName="pojcs101_T27104_chicken_monitors" />
+      <config projectName="exercises" targetName="NOIP2016J_bay" />
+      <config projectName="exercises" targetName="cs101__stage_1__dh_06_02_convex_polygon" />
+      <config projectName="exercises" targetName="pojcs101_T27373_biggest_combination_t2" />
+      <config projectName="exercises" targetName="cs101__stage_1__dh_05_01_newton_sqrt" />
+      <config projectName="exercises" targetName="_others__others_test_cpp" />
+      <config projectName="exercises" targetName="cs101__dh_20260909_11_count_digits" />
+      <config projectName="exercises" targetName="cs101__stage_1__dh_01_05_vote" />
+      <config projectName="exercises" targetName="cs101__stage_pre__dh_00_14_encryption" />
+      <config projectName="exercises" targetName="cs101__stage_1__dh_05_05_pair_of_shit_nums" />
+      <config projectName="exercises" targetName="cs101__stage_2__dh_11_01_change" />
+      <config projectName="exercises" targetName="pojcs101_M01328_radar_greedy_WRONG" />
+      <config projectName="exercises" targetName="dp__backpack_dp__NOIP2005J_herbs_dp_knapsack" />
+      <config projectName="exercises" targetName="dsa__ch2_linear_list__dsa_0202_card_stacking" />
+      <config projectName="exercises" targetName="cs101__stage_1__dh_03_05_perfect_cubes" />
+      <config projectName="exercises" targetName="pojcs101_M02692_12_coins" />
+      <config projectName="exercises" targetName="graph__ECNA2001_sort_letters" />
+      <config projectName="exercises" targetName="cs101__stage_1__dh_04_04_balloons" />
+      <config projectName="exercises" targetName="pojcs101_T12559_biggest_smallest_combination" />
+      <config projectName="exercises" targetName="cs101__stage_1__dh_01_03" />
+      <config projectName="exercises" targetName="pojcs101_E02883" />
+      <config projectName="exercises" targetName="dsa__ch2_linear_list__dsa_0217_magic_square" />
+      <config projectName="exercises" targetName="cs101__stage_2__dh_11_02_shit_num" />
+      <config projectName="exercises" targetName="dp__backpack_dp__NOIP2005J_herbs_dp_knapsack_MWASTE" />
+      <config projectName="exercises" targetName="dp__backpack_dp__NOIP2006S_jinming_budget_dp_knapsack" />
+      <config projectName="exercises" targetName="dp__backpack_dp__NOIP2005J_herbs_dp_knapsack_PINGPONG" />
+      <config projectName="exercises" targetName="JLOI2009_binary_tree_GIVEUP" />
+      <config projectName="exercises" targetName="dsa__ch3_stack_queue__dsa_0306_stack_operation" />
+      <config projectName="exercises" targetName="pojcs101_M03704_brackets" />
+      <config projectName="exercises" targetName="pojcs101_M03441_sum_zero" />
+      <config projectName="exercises" targetName="pojcs101_M01328_radar_greedy" />
+      <config projectName="exercises" targetName="pojcs101_M02746_josephus_problem_simulation" />
+      <config projectName="exercises" targetName="dsa__ch3_stack_queue__USACO12MARs_flowerpot_WRONG" />
+      <config projectName="exercises" targetName="dsa__ch2_linear_list__dsa_0204_prefix_cycle" />
       <config projectName="exercises" targetName="NOIP2003J_bigint" />
       <config projectName="exercises" targetName="pojcs101_M01922_ride_follower" />
       <config projectName="exercises" targetName="luogu_template_dsu_P3367" />
-      <config projectName="exercises" targetName="luogu_P1160_biodir_linked_list" />
-      <config projectName="exercises" targetName="cs101__dh_20260909_12_bottle_exchange" />
-      <config projectName="exercises" targetName="cs101__dh_20260909_05_sum_fractions" />
-      <config projectName="exercises" targetName="pojcs101_E01003" />
-      <config projectName="exercises" targetName="cs101__dh_20260909_14_encryption" />
       <config projectName="exercises" targetName="dsa__ch3_stack_queue__dsa_0302_calculator" />
-      <config projectName="exercises" targetName="JLOI2009_binary_tree" />
       <config projectName="exercises" targetName="pojcs101_M03532" />
-      <config projectName="exercises" targetName="dsa__ch2_linear_list__dsa_0206_binary_query" />
+      <config projectName="exercises" targetName="cs101__stage_pre__dh_00_12_bottle_exchange" />
       <config projectName="exercises" targetName="pojcs101_M01321_chest_grid" />
-      <config projectName="exercises" targetName="cs101__dh_20260917_01" />
-      <config projectName="exercises" targetName="dsa__ch2_linear_list__dsa_0203_string_insertion" />
-      <config projectName="exercises" targetName="cs101__dh_20260923_05_perfect_cubes" />
+      <config projectName="exercises" targetName="cs101__stage_pre__dh_00_10_smaller_numbers" />
+      <config projectName="exercises" targetName="cs101__stage_1__dh_01_01" />
+      <config projectName="exercises" targetName="cs101__stage_1__dh_03_01_bike_or_walk" />
       <config projectName="exercises" targetName="pojcs101_T04117_split_int" />
-      <config projectName="exercises" targetName="pojcs101_T27373_biggest_combination_t2_TLE" />
-      <config projectName="exercises" targetName="cs101__dh_20260909_13_flip" />
-      <config projectName="exercises" targetName="cs101__dh_20260923_02_draw_rectangles" />
       <config projectName="exercises" targetName="pojcs101_M01002_memorable_number" />
-      <config projectName="exercises" targetName="pojcs101_M02524_ubiquitous_religions_dsu" />
+      <config projectName="exercises" targetName="cs101__stage_1__dh_01_02_subway" />
       <config projectName="exercises" targetName="pojcs101_M03247_palindromic_prime" />
       <config projectName="exercises" targetName="SHOI2002_ski" />
       <config projectName="exercises" targetName="pojcs101_E01218" />
       <config projectName="exercises" targetName="dp__NOIP1996S_miner_dp" />
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-      <config projectName="exercises" targetName="dp__SHOI2002_ski_dp" />
-      <config projectName="exercises" targetName="cs101__dh_20260917_05_vote" />
+      <config projectName="exercises" targetName="cs101__stage_pre__dh_00_05_sum_fractions" />
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       <config projectName="exercises" targetName="dsa__ch2_linear_list__dsa_0201_dictionary" />
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       <config projectName="exercises" targetName="dsa__ch3_stack_queue__dsa_0301_sliding_window" />
+      <config projectName="exercises" targetName="dsa__ch3_stack_queue__USACO12MARs_flowerpot" />
       <config projectName="exercises" targetName="pojcs101_T01011_sticks_WRONG" />
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-      <config projectName="exercises" targetName="cs101__dh_20260923_11_fibonacci" />
-      <config projectName="exercises" targetName="cs101__sh_20260923_14_balloons" />
+      <config projectName="exercises" targetName="dsa__ch2_linear_list__SDOI2007_queue" />
+      <config projectName="exercises" targetName="cs101__stage_1__dh_05_05_pair_of_shit_nums_ANALYSIS" />
       <config projectName="exercises" targetName="graph__luogu_P3916_graph_iteration_WRONG" />
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-      <config projectName="exercises" targetName="dsa__ch3_stack_queue__dsa_0302_calculator_WRONG" />
-      <config projectName="exercises" targetName="pojcs101_T27104_chicken_monitors" />
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-      <config projectName="exercises" targetName="cs101__dh_20260917_04" />
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       <config projectName="exercises" targetName="cmake-build-debug-gcc__CMakeFiles__4.3.1__CompilerIdCXX__CMakeCXXCompilerId" />
-      <config projectName="exercises" targetName="NOIP2016J_bay" />
+      <config projectName="exercises" targetName="dp__eagle_egg" />
       <config projectName="exercises" targetName="lc_135_candy" />
-      <config projectName="exercises" targetName="pojcs101_T27373_biggest_combination_t2" />
-      <config projectName="exercises" targetName="cs101__dh_20260909_11_count_digits" />
-      <config projectName="exercises" targetName="pojcs101_M01328_radar_greedy_WRONG" />
-      <config projectName="exercises" targetName="dp__backpack_dp__NOIP2005J_herbs_dp_knapsack" />
+      <config projectName="exercises" targetName="cs101__stage_1__dh_05_04_fried_chicken" />
+      <config projectName="exercises" targetName="cs101__stage_1__dh_04_01_fibonacci" />
       <config projectName="exercises" targetName="graph__USACO06DECs_cow_picnic" />
-      <config projectName="exercises" targetName="cs101__dh_20260917_02_subway" />
-      <config projectName="exercises" targetName="dsa__ch2_linear_list__dsa_0202_card_stacking" />
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-    <list default="true" id="4491295e-723c-4e0b-b7b4-9be1cbde5db8" name="更改" comment="some programs!">
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-      <change afterPath="$PROJECT_DIR$/cs101/dh_03_05_perfect_cubes.cpp" afterDir="false" />
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-      <change afterPath="$PROJECT_DIR$/cs101/sh_04_04_balloons.cpp" afterDir="false" />
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+      <change afterPath="$PROJECT_DIR$/dsa/ch3_stack_queue/USACO12MARs_flowerpot_WRONG.cpp" afterDir="false" />
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+      <change beforePath="$PROJECT_DIR$/cs101/dh_01_02_subway.cpp" beforeDir="false" afterPath="$PROJECT_DIR$/cs101/stage_1/dh_01_02_subway.cpp" afterDir="false" />
+      <change beforePath="$PROJECT_DIR$/cs101/dh_01_03.cpp" beforeDir="false" afterPath="$PROJECT_DIR$/cs101/stage_1/dh_01_03.cpp" afterDir="false" />
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+      <change beforePath="$PROJECT_DIR$/cs101/dh_01_05_vote.cpp" beforeDir="false" afterPath="$PROJECT_DIR$/cs101/stage_1/dh_01_05_vote.cpp" afterDir="false" />
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+      <change beforePath="$PROJECT_DIR$/cs101/dh_03_02_draw_rectangles.cpp" beforeDir="false" afterPath="$PROJECT_DIR$/cs101/stage_1/dh_03_02_draw_rectangles.cpp" afterDir="false" />
+      <change beforePath="$PROJECT_DIR$/cs101/dh_03_03.cpp" beforeDir="false" afterPath="$PROJECT_DIR$/cs101/stage_1/dh_03_03.cpp" afterDir="false" />
+      <change beforePath="$PROJECT_DIR$/cs101/dh_03_04_lamps.cpp" beforeDir="false" afterPath="$PROJECT_DIR$/cs101/stage_1/dh_03_04_lamps.cpp" afterDir="false" />
+      <change beforePath="$PROJECT_DIR$/cs101/dh_03_05_perfect_cubes.cpp" beforeDir="false" afterPath="$PROJECT_DIR$/cs101/stage_1/dh_03_05_perfect_cubes.cpp" afterDir="false" />
+      <change beforePath="$PROJECT_DIR$/cs101/dh_04_01_fibonacci.cpp" beforeDir="false" afterPath="$PROJECT_DIR$/cs101/stage_1/dh_04_01_fibonacci.cpp" afterDir="false" />
+      <change beforePath="$PROJECT_DIR$/cs101/dh_04_04_balloons_init1.py" beforeDir="false" afterPath="$PROJECT_DIR$/cs101/stage_1/dh_04_04_balloons_init1.py" afterDir="false" />
+      <change beforePath="$PROJECT_DIR$/cs101/sh_04_04_balloons.cpp" beforeDir="false" afterPath="$PROJECT_DIR$/cs101/stage_1/dh_04_04_balloons.cpp" afterDir="false" />
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@@ -173,8 +197,8 @@
       <list>
         <option value="C++ Single file program" />
         <option value="CMakeLists.txt" />
-        <option value="C++ Single file for OJ" />
         <option value="Python Script" />
+        <option value="C++ Single file for OJ" />
       </list>
     </option>
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@@ -187,9 +211,12 @@
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   </component>
   <component name="HighlightingSettingsPerFile">
-    <setting file="file://$PROJECT_DIR$/cs101/dh_20260917_01.cpp" root0="FORCE_HIGHLIGHTING" />
+    <setting file="file://$PROJECT_DIR$/_others/others_test.c" root0="FORCE_HIGHLIGHTING" />
+    <setting file="file://$PROJECT_DIR$/cs101/dh_05_05_pair_of_shit_nums_ANALYSIS.cpp" root0="FORCE_HIGHLIGHTING" />
+    <setting file="file://$PROJECT_DIR$/cs101/dh_05_05_pair_of_shit_nums_SIEVE.cpp" root0="FORCE_HIGHLIGHTING" />
+    <setting file="file://$PROJECT_DIR$/cs101/stage_1/dh_05_05_pair_of_shit_nums_SIEVE.cpp" root0="FORCE_HIGHLIGHTING" />
+    <setting file="file://$PROJECT_DIR$/dsa/ch3_stack_queue/USACO12MARs_flowerpot_WRONG.cpp" root0="FORCE_HIGHLIGHTING" />
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@@ -218,6 +245,7 @@
   "keyToString": {
     "ASKED_SHARE_PROJECT_CONFIGURATION_FILES": "true",
     "C/C++ 文件.D_pojcs101_M02692.cpp.executor": "Run",
+    "C/C++ 文件.dh_05_05_pair_of_shit_nums_ANALYSIS.cpp.executor": "Run",
     "C/C++ 文件.dh_20260909_10_smaller_numbers.cpp.executor": "Run",
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@@ -249,6 +277,17 @@
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     "CMake 应用程序.SHOI2002_ski_dp.executor": "Run",
     "CMake 应用程序._others__jzh__jzh_c1_h.executor": "Run",
+    "CMake 应用程序._others__others_test.executor": "Run",
+    "CMake 应用程序._others__others_test_cpp.executor": "Run",
+    "CMake 应用程序.cs101__dh_05_01_newton_sqrt.executor": "Run",
+    "CMake 应用程序.cs101__dh_05_02_three_nums.executor": "Run",
+    "CMake 应用程序.cs101__dh_05_04_fried_chicken.executor": "Run",
+    "CMake 应用程序.cs101__dh_05_05_pair_of_shit_nums.executor": "Run",
+    "CMake 应用程序.cs101__dh_05_05_pair_of_shit_nums_SIEVE.executor": "Run",
+    "CMake 应用程序.cs101__dh_06_02_convex_polygon.executor": "Run",
+    "CMake 应用程序.cs101__dh_06_04_split.executor": "Run",
+    "CMake 应用程序.cs101__dh_11_01_change.executor": "Run",
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@@ -268,7 +307,12 @@
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     "CMake 应用程序.cs101__sh_20260923_14_balloons.executor": "Run",
+    "CMake 应用程序.cs101__stage_2__dh_11_03_jump_rope.executor": "Run",
     "CMake 应用程序.dp__TJOI2007_walk_segments_dp.executor": "Run",
+    "CMake 应用程序.dp__luogu_U434718_eagle_egg.executor": "Run",
+    "CMake 应用程序.dsa__ch2_linear_list__P2629_good_news.executor": "Run",
+    "CMake 应用程序.dsa__ch2_linear_list__SDOI2007_queue.executor": "Run",
+    "CMake 应用程序.dsa__ch3_stack_queue__USACO12MARs_flowerpot.executor": "Run",
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@@ -340,14 +384,19 @@
       <recent name="$PROJECT_DIR$" />
     </key>
     <key name="MoveFile.RECENT_KEYS">
+      <recent name="$PROJECT_DIR$/cs101/stage_2" />
+      <recent name="$PROJECT_DIR$/cs101/stage_0" />
+      <recent name="$PROJECT_DIR$/cs101/stage_1" />
       <recent name="$PROJECT_DIR$" />
       <recent name="$PROJECT_DIR$/graph" />
-      <recent name="$PROJECT_DIR$/dsa/linear_list" />
-      <recent name="$PROJECT_DIR$/dp/backpack_dp" />
-      <recent name="$PROJECT_DIR$/_others" />
     </key>
   </component>
-  <component name="RunManager" selected="Python.dh_04_04_balloons_init1">
+  <component name="RunManager" selected="CMake 应用程序.cs101__stage_2__dh_11_03_jump_rope">
+    <configuration default="true" type="CLionExternalRunConfiguration" factoryName="Application" REDIRECT_INPUT="false" ELEVATE="false" USE_EXTERNAL_CONSOLE="false" EMULATE_TERMINAL="false" PASS_PARENT_ENVS_2="true">
+      <method v="2">
+        <option name="CLION.EXTERNAL.BUILD" enabled="true" />
+      </method>
+    </configuration>
     <configuration default="true" type="CMakeBoostTestRunConfigurationType" factoryName="Boost Test" REDIRECT_INPUT="false" ELEVATE="false" USE_EXTERNAL_CONSOLE="false" EMULATE_TERMINAL="false" PASS_PARENT_ENVS_2="true" TEST_MODE="SUITE_TEST">
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@@ -398,11 +447,6 @@
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@@ -418,6 +462,11 @@
         <option name="com.jetbrains.cidr.execution.CidrBuildBeforeRunTaskProvider$BuildBeforeRunTask" enabled="true" />
       </method>
     </configuration>
+    <configuration name="_others__others_test_cpp" type="CMakeRunConfiguration" factoryName="Application" REDIRECT_INPUT="false" ELEVATE="false" USE_EXTERNAL_CONSOLE="false" EMULATE_TERMINAL="false" PASS_PARENT_ENVS_2="true" PROJECT_NAME="exercises" TARGET_NAME="_others__others_test_cpp" CONFIG_NAME="Debug-GCC" RUN_TARGET_PROJECT_NAME="exercises" RUN_TARGET_NAME="_others__others_test_cpp">
+      <method v="2">
+        <option name="com.jetbrains.cidr.execution.CidrBuildBeforeRunTaskProvider$BuildBeforeRunTask" enabled="true" />
+      </method>
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     <configuration name="cmake-build-debug-gcc__CMakeFiles__4.3.1__CompilerIdCXX__CMakeCXXCompilerId" type="CMakeRunConfiguration" factoryName="Application" REDIRECT_INPUT="false" ELEVATE="false" USE_EXTERNAL_CONSOLE="false" EMULATE_TERMINAL="false" PASS_PARENT_ENVS_2="true" PROJECT_NAME="exercises" TARGET_NAME="cmake-build-debug-gcc__CMakeFiles__4.3.1__CompilerIdCXX__CMakeCXXCompilerId" CONFIG_NAME="Debug-GCC" RUN_TARGET_PROJECT_NAME="exercises" RUN_TARGET_NAME="cmake-build-debug-gcc__CMakeFiles__4.3.1__CompilerIdCXX__CMakeCXXCompilerId">
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@@ -428,102 +477,162 @@
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       <item itemvalue="CMake 应用程序.graph__luogu_P3916_graph_iteration_WRONG" />
@@ -1014,16 +1149,15 @@
       <item itemvalue="CMake 应用程序.pojcs101_M02746_josephus_problem_simulation" />
       <item itemvalue="Python.dh_04_04_balloons_init1" />
       <item itemvalue="Python.NOI2001_food_chain_dsu" />
-      <item itemvalue="Python.dh_00_11_count_digits_init" />
       <item itemvalue="Python.pojcs101_M03247_palindromic_prime_init1" />
     </list>
     <recent_temporary>
       <list>
+        <item itemvalue="C/C++ 文件.dh_05_05_pair_of_shit_nums_ANALYSIS.cpp" />
         <item itemvalue="Python.dh_04_04_balloons_init1" />
         <item itemvalue="CMake 应用程序.pojcs101_M02746_josephus_problem_simulation" />
         <item itemvalue="Python.pojcs101_M03247_palindromic_prime_init1" />
         <item itemvalue="Python.NOI2001_food_chain_dsu" />
-        <item itemvalue="Python.dh_00_11_count_digits_init" />
       </list>
     </recent_temporary>
   </component>
@@ -1031,7 +1165,8 @@
   "profileIdByStamp": [
     {
       "first": {
-        "##RUN_CONFIGURATION##": "Python.dh_20260909_11_count_digits_init"
+        "##RUN_CONFIGURATION##": "CMake 应用程序._others__others_test",
+        "cmake": "CMakeBuildProfile:Debug-GCC"
       },
       "second": "2c1c9069-eeff-46e4-9092-db62e2b1ded5"
     },
@@ -1056,27 +1191,6 @@
       },
       "second": "2c1c9069-eeff-46e4-9092-db62e2b1ded5"
     },
-    {
-      "first": {
-        "##RUN_CONFIGURATION##": "CMake 应用程序.cs101__dh_20260917_02_subway",
-        "cmake": "CMakeBuildProfile:Debug-GCC"
-      },
-      "second": "2c1c9069-eeff-46e4-9092-db62e2b1ded5"
-    },
-    {
-      "first": {
-        "##RUN_CONFIGURATION##": "CMake 应用程序.cs101__dh_20260909_14_encryption",
-        "cmake": "CMakeBuildProfile:Debug-GCC"
-      },
-      "second": "2c1c9069-eeff-46e4-9092-db62e2b1ded5"
-    },
-    {
-      "first": {
-        "##RUN_CONFIGURATION##": "CMake 应用程序.cs101__dh_20260923_05_perfect_cubes",
-        "cmake": "CMakeBuildProfile:Debug-GCC"
-      },
-      "second": "2c1c9069-eeff-46e4-9092-db62e2b1ded5"
-    },
     {
       "first": {
         "##RUN_CONFIGURATION##": "CMake 应用程序.luogu_P1160_biodir_linked_list",
@@ -1084,13 +1198,6 @@
       },
       "second": "2c1c9069-eeff-46e4-9092-db62e2b1ded5"
     },
-    {
-      "first": {
-        "##RUN_CONFIGURATION##": "CMake 应用程序.cs101__dh_20260917_04",
-        "cmake": "CMakeBuildProfile:Debug-GCC"
-      },
-      "second": "2c1c9069-eeff-46e4-9092-db62e2b1ded5"
-    },
     {
       "first": {
         "##RUN_CONFIGURATION##": "CMake 应用程序.NOIP2016J_bay",
@@ -1114,21 +1221,14 @@
     },
     {
       "first": {
-        "##RUN_CONFIGURATION##": "CMake 应用程序.cs101__dh_20260917_01",
+        "##RUN_CONFIGURATION##": "CMake 应用程序.pojcs101_T27104_chicken_monitors",
         "cmake": "CMakeBuildProfile:Debug-GCC"
       },
       "second": "2c1c9069-eeff-46e4-9092-db62e2b1ded5"
     },
     {
       "first": {
-        "##RUN_CONFIGURATION##": "CMake 应用程序.cs101__dh_20260923_03",
-        "cmake": "CMakeBuildProfile:Debug-GCC"
-      },
-      "second": "2c1c9069-eeff-46e4-9092-db62e2b1ded5"
-    },
-    {
-      "first": {
-        "##RUN_CONFIGURATION##": "CMake 应用程序.cs101__dh_20260909_16_swap_bits",
+        "##RUN_CONFIGURATION##": "CMake 应用程序.dsa__ch3_stack_queue__USACO12MARs_flowerpot",
         "cmake": "CMakeBuildProfile:Debug-GCC"
       },
       "second": "2c1c9069-eeff-46e4-9092-db62e2b1ded5"
@@ -1149,42 +1249,19 @@
     },
     {
       "first": {
-        "##RUN_CONFIGURATION##": "CMake 应用程序.cs101__dh_20260923_02_draw_rectangles",
-        "cmake": "CMakeBuildProfile:Debug-GCC"
+        "##RUN_CONFIGURATION##": "C/C++ 文件.dh_05_05_pair_of_shit_nums_ANALYSIS.cpp"
       },
       "second": "2c1c9069-eeff-46e4-9092-db62e2b1ded5"
     },
     {
       "first": {
-        "##RUN_CONFIGURATION##": "CMake 应用程序.cs101__sh_20260923_14_balloons",
-        "cmake": "CMakeBuildProfile:Debug-GCC"
+        "##RUN_CONFIGURATION##": "Python.dh_04_04_balloons_init1"
       },
       "second": "2c1c9069-eeff-46e4-9092-db62e2b1ded5"
     },
     {
       "first": {
-        "##RUN_CONFIGURATION##": "CMake 应用程序.cs101__dh_20260909_12_bottle_exchange",
-        "cmake": "CMakeBuildProfile:Debug-GCC"
-      },
-      "second": "2c1c9069-eeff-46e4-9092-db62e2b1ded5"
-    },
-    {
-      "first": {
-        "##RUN_CONFIGURATION##": "CMake 应用程序.cs101__dh_20260917_03",
-        "cmake": "CMakeBuildProfile:Debug-GCC"
-      },
-      "second": "2c1c9069-eeff-46e4-9092-db62e2b1ded5"
-    },
-    {
-      "first": {
-        "##RUN_CONFIGURATION##": "CMake 应用程序.cs101__dh_20260923_04_lamps",
-        "cmake": "CMakeBuildProfile:Debug-GCC"
-      },
-      "second": "2c1c9069-eeff-46e4-9092-db62e2b1ded5"
-    },
-    {
-      "first": {
-        "##RUN_CONFIGURATION##": "CMake 应用程序.cs101__dh_20260909_10_smaller_numbers",
+        "##RUN_CONFIGURATION##": "CMake 应用程序.dsa__ch2_linear_list__SDOI2007_queue",
         "cmake": "CMakeBuildProfile:Debug-GCC"
       },
       "second": "2c1c9069-eeff-46e4-9092-db62e2b1ded5"
@@ -1196,13 +1273,6 @@
       },
       "second": "2c1c9069-eeff-46e4-9092-db62e2b1ded5"
     },
-    {
-      "first": {
-        "##RUN_CONFIGURATION##": "CMake 应用程序.cs101__dh_20260909_13_flip",
-        "cmake": "CMakeBuildProfile:Debug-GCC"
-      },
-      "second": "2c1c9069-eeff-46e4-9092-db62e2b1ded5"
-    },
     {
       "first": {
         "##RUN_CONFIGURATION##": "CMake 应用程序.dsa__ch3_stack_queue__dsa_0306_stack_operation",
@@ -1212,7 +1282,7 @@
     },
     {
       "first": {
-        "##RUN_CONFIGURATION##": "CMake 应用程序.cs101__dh_20260909_15_jusephus",
+        "##RUN_CONFIGURATION##": "CMake 应用程序.cs101__stage_2__dh_11_03_jump_rope",
         "cmake": "CMakeBuildProfile:Debug-GCC"
       },
       "second": "2c1c9069-eeff-46e4-9092-db62e2b1ded5"
@@ -1240,26 +1310,27 @@
     },
     {
       "first": {
-        "##RUN_CONFIGURATION##": "CMake 应用程序.cs101__dh_20260923_11_fibonacci",
+        "##RUN_CONFIGURATION##": "CMake 应用程序.dp__eagle_egg",
         "cmake": "CMakeBuildProfile:Debug-GCC"
       },
       "second": "2c1c9069-eeff-46e4-9092-db62e2b1ded5"
     },
     {
       "first": {
-        "##RUN_CONFIGURATION##": "Python.dh_20260923_14_balloons_init1"
+        "##RUN_CONFIGURATION##": "CMake 应用程序._others__others_test_cpp",
+        "cmake": "CMakeBuildProfile:Debug-GCC"
       },
       "second": "2c1c9069-eeff-46e4-9092-db62e2b1ded5"
     },
     {
       "first": {
-        "##RUN_CONFIGURATION##": "CMake 应用程序.cs101__dh_20260923_01_bike_or_walk",
+        "##RUN_CONFIGURATION##": "CMake 应用程序.dsa__ch2_linear_list__P2629_good_news",
         "cmake": "CMakeBuildProfile:Debug-GCC"
       },
       "second": "2c1c9069-eeff-46e4-9092-db62e2b1ded5"
     }
   ],
-  "modificationCount": 154
+  "modificationCount": 192
 }]]></component>
   <component name="SharedIndexes">
     <attachedChunks>
@@ -1298,7 +1369,8 @@
     <MESSAGE value="Update CMakeLists.txt" />
     <MESSAGE value="some programs" />
     <MESSAGE value="some programs!" />
-    <option name="LAST_COMMIT_MESSAGE" value="some programs!" />
+    <MESSAGE value="some programs!!" />
+    <option name="LAST_COMMIT_MESSAGE" value="some programs!!" />
   </component>
   <component name="XDebuggerManager">
     <breakpoint-manager>
@@ -1309,7 +1381,7 @@
           <option name="timeStamp" value="6" />
         </line-breakpoint>
         <line-breakpoint enabled="true" suspend="THREAD" type="python-line">
-          <url>file://$PROJECT_DIR$/cs101/dh_04_04_balloons_init1.py</url>
+          <url>file://$PROJECT_DIR$/cs101/stage_1/dh_04_04_balloons_init1.py</url>
           <line>9</line>
           <option name="timeStamp" value="59" />
         </line-breakpoint>
@@ -1339,12 +1411,7 @@
           <option name="timeStamp" value="43" />
         </line-breakpoint>
         <line-breakpoint enabled="true" type="com.jetbrains.cidr.execution.debugger.OCBreakpointType">
-          <url>file://$PROJECT_DIR$/cs101/dh_01_01.cpp</url>
-          <line>5</line>
-          <option name="timeStamp" value="44" />
-        </line-breakpoint>
-        <line-breakpoint enabled="true" type="com.jetbrains.cidr.execution.debugger.OCBreakpointType">
-          <url>file://$PROJECT_DIR$/cs101/dh_03_05_perfect_cubes.cpp</url>
+          <url>file://$PROJECT_DIR$/cs101/stage_1/dh_03_05_perfect_cubes.cpp</url>
           <line>43</line>
           <option name="timeStamp" value="48" />
         </line-breakpoint>
@@ -1353,11 +1420,6 @@
           <line>69</line>
           <option name="timeStamp" value="49" />
         </line-breakpoint>
-        <line-breakpoint enabled="true" type="com.jetbrains.cidr.execution.debugger.OCBreakpointType">
-          <url>file://$PROJECT_DIR$/dsa/ch3_stack_queue/dsa_0306_stack_operation.cpp</url>
-          <line>24</line>
-          <option name="timeStamp" value="50" />
-        </line-breakpoint>
         <line-breakpoint enabled="true" type="com.jetbrains.cidr.execution.debugger.OCBreakpointType">
           <url>file://$PROJECT_DIR$/dsa/ch3_stack_queue/dsa_0302_calculator_WRONG.cpp</url>
           <line>99</line>
@@ -1369,9 +1431,34 @@
           <option name="timeStamp" value="57" />
         </line-breakpoint>
         <line-breakpoint enabled="true" type="com.jetbrains.cidr.execution.debugger.OCBreakpointType">
-          <url>file://$PROJECT_DIR$/cs101/sh_04_04_balloons.cpp</url>
-          <line>10</line>
-          <option name="timeStamp" value="61" />
+          <url>file://$PROJECT_DIR$/dsa/ch2_linear_list/SDOI2007_queue.cpp</url>
+          <line>77</line>
+          <option name="timeStamp" value="66" />
+        </line-breakpoint>
+        <line-breakpoint enabled="true" type="com.jetbrains.cidr.execution.debugger.OCBreakpointType">
+          <url>file://$PROJECT_DIR$/dsa/ch2_linear_list/SDOI2007_queue.cpp</url>
+          <line>64</line>
+          <option name="timeStamp" value="67" />
+        </line-breakpoint>
+        <line-breakpoint enabled="true" type="com.jetbrains.cidr.execution.debugger.OCBreakpointType">
+          <url>file://$PROJECT_DIR$/dsa/ch2_linear_list/P2629_good_news.cpp</url>
+          <line>36</line>
+          <option name="timeStamp" value="70" />
+        </line-breakpoint>
+        <line-breakpoint enabled="true" type="com.jetbrains.cidr.execution.debugger.OCBreakpointType">
+          <url>file://$PROJECT_DIR$/cs101/stage_1/dh_05_01_newton_sqrt.cpp</url>
+          <line>13</line>
+          <option name="timeStamp" value="79" />
+        </line-breakpoint>
+        <line-breakpoint enabled="true" type="com.jetbrains.cidr.execution.debugger.OCBreakpointType">
+          <url>file://$PROJECT_DIR$/cs101/stage_1/dh_06_02_convex_polygon.cpp</url>
+          <line>37</line>
+          <option name="timeStamp" value="80" />
+        </line-breakpoint>
+        <line-breakpoint enabled="true" type="com.jetbrains.cidr.execution.debugger.OCBreakpointType">
+          <url>file://$PROJECT_DIR$/cs101/stage_2/dh_11_01_change.cpp</url>
+          <line>46</line>
+          <option name="timeStamp" value="81" />
         </line-breakpoint>
       </breakpoints>
     </breakpoint-manager>
diff --git a/CMakeLists.txt b/CMakeLists.txt
index af81406..4c6609c 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -7,6 +7,8 @@ set(CMAKE_C_STANDARD_REQUIRED ON)
 set(CMAKE_CXX_STANDARD 17)
 set(CMAKE_CXX_STANDARD_REQUIRED ON)
 
+#set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -O2")
+
 file(GLOB_RECURSE SOURCES "*.cpp" "*.c")
 
 foreach (source ${SOURCES})
diff --git a/_others/others_test.c b/_others/others_test.c
new file mode 100644
index 0000000..c13bdee
--- /dev/null
+++ b/_others/others_test.c
@@ -0,0 +1,21 @@
+#include <stdio.h>
+
+#define _NOT_USED \
+'''
+
+int main() {
+    int a, b;
+    scanf("%d%d", &a, &b);
+    printf("%d", a + b);
+    return 0;
+}
+
+#define _NOT_USED \
+'''
+
+#define _NOT_USED /*
+
+a, b = map(int, input().split())
+print(a + b)
+
+#*/
diff --git a/_others/others_test.c.cpp b/_others/others_test.c.cpp
deleted file mode 100644
index 972cab0..0000000
--- a/_others/others_test.c.cpp
+++ /dev/null
@@ -1,50 +0,0 @@
-#include <stdio.h>
-
-int main() {
-    long long T; //注意变量都要初始化 ,T为数组个数
-    scanf("%lld", &T); //数组个数，决定过程要执行多少次
-    for (int i = 0; i < T; i++) {
-        long long n, m, bianhao, yushu, max = -1, index; //注意变量都要初始化，n为包裹个数，m为箱子个数，result是余数，max是装的最多
-        //以上变量必须定义在循环里，因为一组过后所有数据要重新开始！要不然max，index值未清除！
-        scanf("%lld%lld", &n, &m); //键入包裹的个数和箱子的个数
-        long long Amount[m], number[n]; //Amount是定义对应的箱子里装几个 ，number是用数组记录包裹的“编号”
-        //禁止写错数组个数！
-        for (int j = 0; j < m; j++) //初始化箱子数组 ,注意数组是m个
-        {
-            Amount[j] = 0;
-        }
-        for (int k = 0; k < n; k++) //把包裹赋值，记录到number里 注意数组是n个
-        {
-            scanf("%lld", &bianhao);
-            number[k] = bianhao;
-        }
-        for (int s = 0; s < n; s++) //进行mol m运算，余数计入number里
-        {
-            yushu = number[s] % m;
-            Amount[yushu] = Amount[yushu] + 1;
-        }
-        for (int t = 0; t < m; t++) //此循环计算哪个箱子装的最多
-        {
-            //max=-1;错误  在循环里定义会导致max每走一个t都会被重置！
-            if (max < Amount[t]) {
-                max = Amount[t];
-            }
-        }
-        for (int u = 0; u < m; u++) //此循环寻找下标
-        {
-            if (Amount[u] == max) {
-                index = u;
-                break;
-            }
-        }
-        for (int v = 0; v < m; v++) //此循环输出amount数组里各个元素的大小
-        {
-            printf("%lld ", Amount[v]);
-        }
-        printf("\n");
-        printf("%lld %lld", index, max);
-        printf("\n");
-    }
-    return 0;
-}
-
diff --git a/_others/others_test_cpp.cpp b/_others/others_test_cpp.cpp
new file mode 100644
index 0000000..076c93f
--- /dev/null
+++ b/_others/others_test_cpp.cpp
@@ -0,0 +1,29 @@
+#include <bits/stdc++.h>
+
+using namespace std;
+
+constexpr float ALLOWED_DIFF = 1e-6;
+
+std::tuple<int, double> sqrt_custom(double x) {
+    double est_prev = -1, est_curr = x;
+    int rounds = 0;
+    while (abs(est_curr - est_prev) > ALLOWED_DIFF) {
+        est_prev = est_curr;
+        // est_curr = 0.5 * (est_prev + x / est_prev);
+        est_curr = x / (2 * est_curr) + 0.5 * est_curr;
+        rounds++;
+    }
+    return std::make_tuple(rounds, est_curr);
+}
+
+int main() {
+    std::ios::sync_with_stdio(false);
+    std::cin.tie(nullptr);
+    int x;
+    while (std::cin >> x) {
+        auto [rounds, ans] = sqrt_custom(x);
+        std::cout << rounds << " " << std::fixed << std::setprecision(2) << ans << std::endl;
+    }
+
+    return 0;
+}
diff --git a/cs101/dh_01_01.cpp b/cs101/stage_1/dh_01_01.cpp
similarity index 100%
rename from cs101/dh_01_01.cpp
rename to cs101/stage_1/dh_01_01.cpp
diff --git a/cs101/dh_01_02_subway.cpp b/cs101/stage_1/dh_01_02_subway.cpp
similarity index 100%
rename from cs101/dh_01_02_subway.cpp
rename to cs101/stage_1/dh_01_02_subway.cpp
diff --git a/cs101/dh_01_03.cpp b/cs101/stage_1/dh_01_03.cpp
similarity index 100%
rename from cs101/dh_01_03.cpp
rename to cs101/stage_1/dh_01_03.cpp
diff --git a/cs101/dh_01_04.cpp b/cs101/stage_1/dh_01_04.cpp
similarity index 100%
rename from cs101/dh_01_04.cpp
rename to cs101/stage_1/dh_01_04.cpp
diff --git a/cs101/dh_01_05_vote.cpp b/cs101/stage_1/dh_01_05_vote.cpp
similarity index 100%
rename from cs101/dh_01_05_vote.cpp
rename to cs101/stage_1/dh_01_05_vote.cpp
diff --git a/cs101/dh_03_01_bike_or_walk.cpp b/cs101/stage_1/dh_03_01_bike_or_walk.cpp
similarity index 100%
rename from cs101/dh_03_01_bike_or_walk.cpp
rename to cs101/stage_1/dh_03_01_bike_or_walk.cpp
diff --git a/cs101/dh_03_02_draw_rectangles.cpp b/cs101/stage_1/dh_03_02_draw_rectangles.cpp
similarity index 100%
rename from cs101/dh_03_02_draw_rectangles.cpp
rename to cs101/stage_1/dh_03_02_draw_rectangles.cpp
diff --git a/cs101/dh_03_03.cpp b/cs101/stage_1/dh_03_03.cpp
similarity index 100%
rename from cs101/dh_03_03.cpp
rename to cs101/stage_1/dh_03_03.cpp
diff --git a/cs101/dh_03_04_lamps.cpp b/cs101/stage_1/dh_03_04_lamps.cpp
similarity index 100%
rename from cs101/dh_03_04_lamps.cpp
rename to cs101/stage_1/dh_03_04_lamps.cpp
diff --git a/cs101/dh_03_05_perfect_cubes.cpp b/cs101/stage_1/dh_03_05_perfect_cubes.cpp
similarity index 100%
rename from cs101/dh_03_05_perfect_cubes.cpp
rename to cs101/stage_1/dh_03_05_perfect_cubes.cpp
diff --git a/cs101/dh_04_01_fibonacci.cpp b/cs101/stage_1/dh_04_01_fibonacci.cpp
similarity index 100%
rename from cs101/dh_04_01_fibonacci.cpp
rename to cs101/stage_1/dh_04_01_fibonacci.cpp
diff --git a/cs101/sh_04_04_balloons.cpp b/cs101/stage_1/dh_04_04_balloons.cpp
similarity index 100%
rename from cs101/sh_04_04_balloons.cpp
rename to cs101/stage_1/dh_04_04_balloons.cpp
diff --git a/cs101/dh_04_04_balloons_init1.py b/cs101/stage_1/dh_04_04_balloons_init1.py
similarity index 100%
rename from cs101/dh_04_04_balloons_init1.py
rename to cs101/stage_1/dh_04_04_balloons_init1.py
diff --git a/cs101/stage_1/dh_05_01_newton_sqrt.cpp b/cs101/stage_1/dh_05_01_newton_sqrt.cpp
new file mode 100644
index 0000000..63c39d8
--- /dev/null
+++ b/cs101/stage_1/dh_05_01_newton_sqrt.cpp
@@ -0,0 +1,29 @@
+#include <cmath>
+#include <iomanip>
+#include <iostream>
+
+constexpr float ALLOWED_DIFF = 1e-6;
+
+std::tuple<int, double> sqrt_custom(double x) {
+    double est_prev = -1, est_curr = x;
+    int rounds = 0;
+    while (std::abs(est_curr - est_prev) > ALLOWED_DIFF) {
+        est_prev = est_curr;
+        est_curr = 0.5 * (est_prev + x / est_prev);
+        // est_curr = x / (2 * est_prev) + 0.5 * est_prev;
+        rounds++;
+    }
+    return std::make_tuple(rounds, est_curr);
+}
+
+int main() {
+    std::ios::sync_with_stdio(false);
+    std::cin.tie(nullptr);
+    int x;
+    while (std::cin >> x) {
+        auto [rounds, ans] = sqrt_custom(x);
+        std::cout << rounds << " " << std::fixed << std::setprecision(2) << ans << std::endl;
+    }
+
+    return 0;
+}
diff --git a/cs101/stage_1/dh_05_02_three_nums.cpp b/cs101/stage_1/dh_05_02_three_nums.cpp
new file mode 100644
index 0000000..df36c6c
--- /dev/null
+++ b/cs101/stage_1/dh_05_02_three_nums.cpp
@@ -0,0 +1,42 @@
+#include <iostream>
+#include <cmath>
+#include <cstring>
+#include <vector>
+
+short get_digit(int num, int digit) {
+    return num / static_cast<int>(pow(10, digit)) % 10;
+}
+
+std::vector<std::tuple<int, int, int>> answers;
+bool digits_bucket[10];
+int nums[3];
+
+int main() {
+    std::ios::sync_with_stdio(false);
+    std::cin.tie(nullptr);
+
+    for (nums[0] = 123; nums[0] <= 333; nums[0]++) {
+        memset(digits_bucket, false, sizeof(digits_bucket));
+        nums[1] = 2 * nums[0], nums[2] = 3 * nums[0];
+        bool success_flag = true;
+        for (int num : nums) {
+            for (int digit = 0; digit < 3; digit++) {
+                int x = get_digit(num, digit);
+                if (digits_bucket[x] || x == 0) {
+                    success_flag = false;
+                    break;
+                }
+                digits_bucket[x] = true;
+            }
+            if (!success_flag) { break; }
+        }
+        if (success_flag) {
+            answers.emplace_back(nums[0], nums[1], nums[2]);
+        }
+    }
+    for (const auto [a,b,c] : answers) {
+        std::cout << a << " " << b << " " << c << std::endl;
+    }
+
+    return 0;
+}
diff --git a/cs101/stage_1/dh_05_03_different_num.cpp b/cs101/stage_1/dh_05_03_different_num.cpp
new file mode 100644
index 0000000..366dc03
--- /dev/null
+++ b/cs101/stage_1/dh_05_03_different_num.cpp
@@ -0,0 +1,18 @@
+#include <iostream>
+
+int ans;
+
+int main() {
+    std::ios::sync_with_stdio(false);
+    std::cin.tie(nullptr);
+    int n;
+    std::cin >> n;
+    for (int _ = 0; _ < n; _++) {
+        int x;
+        std::cin >> x;
+        ans ^= x;
+    }
+    std::cout << ans << std::endl;
+
+    return 0;
+}
diff --git a/cs101/stage_1/dh_05_04_fried_chicken.cpp b/cs101/stage_1/dh_05_04_fried_chicken.cpp
new file mode 100644
index 0000000..dac0c9d
--- /dev/null
+++ b/cs101/stage_1/dh_05_04_fried_chicken.cpp
@@ -0,0 +1,18 @@
+#include <iostream>
+#include <cmath>
+
+int chicken_count, coroutines;
+
+int main() {
+    std::ios::sync_with_stdio(false);
+    std::cin.tie(nullptr);
+
+    std::cin >> chicken_count >> coroutines;
+    if (chicken_count == 1) {
+        std::cout << 2 << std::endl;
+        return 0;
+    }
+    std::cout << static_cast<int>(ceil(1.0l * chicken_count * 2 / coroutines)) << std::endl;
+
+    return 0;
+}
diff --git a/cs101/stage_1/dh_05_05_pair_of_shit_nums.cpp b/cs101/stage_1/dh_05_05_pair_of_shit_nums.cpp
new file mode 100644
index 0000000..7448fb7
--- /dev/null
+++ b/cs101/stage_1/dh_05_05_pair_of_shit_nums.cpp
@@ -0,0 +1,28 @@
+#include <iostream>
+
+constexpr int MAX_N = 1e5 + 1;
+
+int calc_factors_sum(int x) {
+    int sum = 0, i = 1;
+    for (i = 1; i * i < x; i++) {
+        if (x % i == 0) { sum += i + x / i; }
+    }
+    if (i * i == x) { sum += i; }
+    return sum - x;
+}
+
+int main() {
+    std::ios::sync_with_stdio(false);
+    std::cin.tie(nullptr);
+
+    int n;
+    std::cin >> n;
+    for (int a = 220; a <= n; a++) {
+        int b = calc_factors_sum(a);
+        if (b > a && b <= n && calc_factors_sum(b) == a) {
+            std::cout << a << " " << b << std::endl;
+        }
+    }
+
+    return 0;
+}
diff --git a/cs101/stage_1/dh_05_05_pair_of_shit_nums_ANALYSIS.cpp b/cs101/stage_1/dh_05_05_pair_of_shit_nums_ANALYSIS.cpp
new file mode 100644
index 0000000..b088443
--- /dev/null
+++ b/cs101/stage_1/dh_05_05_pair_of_shit_nums_ANALYSIS.cpp
@@ -0,0 +1,137 @@
+#include <array>
+#include <iostream>
+#include <vector>
+#include <cmath>
+#include <chrono>
+#include <map>
+#include <set>
+
+constexpr int MAX_N = 1e5 + 1;
+
+std::vector<int> primes;
+std::array<bool, MAX_N> not_prime;
+
+std::multiset<std::pair<long long, int>, std::greater<>> calc_times, calc_times_old;
+
+void init_primes() {
+    primes.reserve(MAX_N / 10);
+    primes.push_back(2);
+
+    for (int i = 3; i < MAX_N; i++) {
+        if (!not_prime[i]) {
+            primes.push_back(i);
+            for (int x = i + i; x < MAX_N; x += i) {
+                not_prime[x] = true;
+            }
+        }
+    }
+    // int shit = 0;
+    // for (int i = 0; i < 10000000; i++) {
+    //     shit++;
+    // }
+}
+
+long long calc_factors_sum(int x) {
+    // std::vector<int> prime_exponents(primes.size());
+    std::array<int, MAX_N / 10> prime_exponents{};
+    int prime_idx = 0, old_x = x;
+    while (x > 1) {
+        if (x % primes[prime_idx] == 0) {
+            x /= primes[prime_idx], prime_exponents[prime_idx]++;
+        } else {
+            prime_idx++;
+        }
+    }
+    long long sum = 1;
+    for (int i = 0; i <= prime_idx; i++) {
+        if (!prime_exponents[i]) { continue; }
+        if (prime_exponents[i] == 1) {
+            sum *= primes[i] + 1;
+        } else {
+            sum *= (static_cast<long long>(std::pow(primes[i], prime_exponents[i] + 1)) - 1)
+                / (primes[i] - 1);
+        }
+    }
+    // std::clog << sum << std::endl;
+    return sum - old_x;
+}
+
+
+long long calc_factors_sum_old(int x) {
+    long long sum = 0;
+    int i = 1;
+    for (i = 1; i * i < x; i++) {
+        if (x % i == 0) { sum += i + x / i; }
+    }
+    if (i * i == x) { sum += i; }
+    return sum - x;
+}
+
+
+template <typename Func, typename... Args>
+auto time_function(const std::string& name, Func&& func, Args&&... args) {
+    auto start = std::chrono::high_resolution_clock::now();
+
+    // 完美转发参数并调用函数
+    for (int i = 0; i < 100; i++) {
+        auto result = std::forward<Func>(func)(std::forward<Args>(args)...);
+    }
+
+    auto end = std::chrono::high_resolution_clock::now();
+    auto duration = std::chrono::duration_cast<std::chrono::microseconds>(end - start);
+
+    // std::clog << "[" << name << "] 耗时: "
+    //     << duration.count() << " μs " << std::endl;
+
+    // return result; // 返回函数的返回值（如果有）
+    return duration.count() / 100;
+}
+
+
+int main() {
+    std::ios::sync_with_stdio(false);
+    std::cin.tie(nullptr);
+
+    // auto s1 = std::chrono::high_resolution_clock::now();
+    // init_primes();
+    // auto e1 = std::chrono::high_resolution_clock::now();
+    // auto duration = std::chrono::duration_cast<std::chrono::milliseconds>(e1 - s1);
+    //
+    // std::clog << duration.count() << std::endl;
+
+    init_primes();
+
+    std::cout << "OLD" << std::endl;
+    for (int x = 2; x < MAX_N; x++) {
+        calc_times_old.insert({time_function("", calc_factors_sum_old, x), x});
+    }
+
+    int count = 0;
+    for (auto it = calc_times_old.begin(); it != calc_times_old.end() && count < 10; ++it, ++count) {
+        std::cout << "OLD " << it->second << "->" << it->first << std::endl;
+    }
+
+
+    std::cout << "NEW" << std::endl;
+    for (int x = 2; x < MAX_N; x++) {
+        calc_times.insert({time_function("", calc_factors_sum, x), x});
+    }
+
+    count = 0;
+    for (auto it = calc_times.begin(); it != calc_times.end() && count < 10; ++it, ++count) {
+        std::cout << it->second << "->" << it->first << std::endl;
+    }
+
+
+    // int n;
+    // std::cin >> n;
+    // for (int a = 220; a <= n; a++) {
+    //     long long b = calc_factors_sum(a);
+    //     if (b > MAX_N) { continue; }
+    //     if (b > a && b <= n && calc_factors_sum(static_cast<int>(b)) == a) {
+    //         std::cout << a << " " << b << std::endl;
+    //     }
+    // }
+
+    return 0;
+}
diff --git a/cs101/stage_1/dh_05_05_pair_of_shit_nums_SIEVE.cpp b/cs101/stage_1/dh_05_05_pair_of_shit_nums_SIEVE.cpp
new file mode 100644
index 0000000..584673d
--- /dev/null
+++ b/cs101/stage_1/dh_05_05_pair_of_shit_nums_SIEVE.cpp
@@ -0,0 +1,68 @@
+#include <array>
+#include <iostream>
+#include <vector>
+#include <cmath>
+
+#include <chrono>
+
+constexpr int MAX_N = 1e5 + 1;
+
+std::vector<int> primes;
+std::array<bool, MAX_N> not_prime;
+
+void init_primes() {
+    primes.reserve(MAX_N / 10);
+    primes.push_back(2);
+
+    for (int i = 3; i < MAX_N; i++) {
+        if (!not_prime[i]) {
+            primes.push_back(i);
+            for (int x = i + i; x < MAX_N; x += i) {
+                not_prime[x] = true;
+            }
+        }
+    }
+}
+
+long long calc_factors_sum(int x) {
+    std::vector<int> prime_exponents(primes.size());
+    int prime_idx = 0, old_x = x;
+    while (x > 1) {
+        if (x % primes[prime_idx] == 0) {
+            x /= primes[prime_idx], prime_exponents[prime_idx]++;
+        } else {
+            prime_idx++;
+        }
+    }
+    long long sum = 1;
+    for (int i = 0; i <= prime_idx; i++) {
+        if (!prime_exponents[i]) { continue; }
+        if (prime_exponents[i] == 1) {
+            sum *= primes[i] + 1;
+        } else {
+            sum *= (static_cast<long long>(std::pow(primes[i], prime_exponents[i] + 1)) - 1)
+                / (primes[i] - 1);
+        }
+    }
+    // std::clog << sum << std::endl;
+    return sum - old_x;
+}
+
+int main() {
+    std::ios::sync_with_stdio(false);
+    std::cin.tie(nullptr);
+
+    init_primes();
+
+    int n;
+    std::cin >> n;
+    for (int a = 220; a <= n; a++) {
+        long long b = calc_factors_sum(a);
+        if (b > MAX_N) { continue; }
+        if (b > a && b <= n && calc_factors_sum(static_cast<int>(b)) == a) {
+            std::cout << a << " " << b << std::endl;
+        }
+    }
+
+    return 0;
+}
diff --git a/cs101/stage_1/dh_06_02_convex_polygon.cpp b/cs101/stage_1/dh_06_02_convex_polygon.cpp
new file mode 100644
index 0000000..362f17c
--- /dev/null
+++ b/cs101/stage_1/dh_06_02_convex_polygon.cpp
@@ -0,0 +1,67 @@
+#include <array>
+#include <iostream>
+#include <vector>
+
+class Vector2 {
+public:
+    int x, y;
+
+    constexpr int& operator[](const std::size_t idx) {
+        switch (idx) {
+        case 0: return x;
+        case 1: return y;
+        default: throw std::invalid_argument("Index should be 0 or 1");
+        }
+    }
+
+    constexpr Vector2 operator+(const Vector2 other) const {
+        return Vector2{x + other.x, y + other.y};
+    }
+
+    constexpr Vector2 operator-() const {
+        return Vector2{-x, -y};
+    }
+
+    constexpr Vector2 operator-(const Vector2 other) const {
+        return *this + -other;
+    }
+
+    constexpr static int cross(const Vector2 a, const Vector2 b) {
+        return a.x * b.y - a.y * b.x;
+    }
+};
+
+bool is_convex(std::vector<Vector2> polygon) {
+    for (int i = 0; i < polygon.size() - 1; i++) {
+        // if (Vector2::cross(polygon[i], polygon[i + 1]) * sign <= 0) { return false; }
+        // Vector2 side1 = polygon[i + 1] - polygon[i];
+        int sign = 0;
+        for (int j = 0; j < polygon.size(); j++) {
+            if (i == j || i + 1 == j) { continue; }
+            if (sign == 0) {
+                sign = Vector2::cross(polygon[i] - polygon[i + 1], polygon[j] - polygon[i + 1]);
+                if (sign == 0) { return false; }
+                sign = sign > 0 ? 1 : -1;
+                continue;
+            }
+            if (Vector2::cross(polygon[i] - polygon[i + 1], polygon[j] - polygon[i + 1]) * sign <= 0) {
+                return false;
+            }
+        }
+    }
+    return true;
+}
+
+int main() {
+    std::ios::sync_with_stdio(false);
+    std::cin.tie(nullptr);
+
+    std::vector<Vector2> coords(4);
+
+    while (std::cin >> coords[0].x >> coords[0].y) {
+        for (int i = 1; i <= 3; ++i) { std::cin >> coords[i].x >> coords[i].y; }
+        std::cout << (is_convex(coords) ? "yes" : "no") << std::endl;
+    }
+
+    return 0;
+}
diff --git a/cs101/stage_1/dh_06_04_split.cpp b/cs101/stage_1/dh_06_04_split.cpp
new file mode 100644
index 0000000..9c6253f
--- /dev/null
+++ b/cs101/stage_1/dh_06_04_split.cpp
@@ -0,0 +1,46 @@
+#include <iostream>
+#include <vector>
+
+constexpr int MAX_N = 10001, MAX_D = 50;
+
+int get_digits_sum(int x) {
+    int sum = 0;
+    while (x) {
+        sum += x % 10;
+        x /= 10;
+    }
+    return sum;
+}
+
+int m, n, k;
+std::vector<int> bucket[MAX_D];
+
+int main() {
+    std::ios::sync_with_stdio(false);
+    std::cin.tie(nullptr);
+
+    char temp_buffer;
+    std::cin >> m >> temp_buffer >> n >> temp_buffer >> k;
+
+    for (int x = m + 1; x < n; x++) {
+        int digits_sum = get_digits_sum(x);
+        if (digits_sum % k != 0) { continue; }
+        bucket[digits_sum].push_back(x);
+    }
+
+    for (const auto& nums : bucket) {
+        if (nums.empty()) { continue; }
+        bool first = true;
+        for (int num : nums) {
+            if (first) {
+                first = false;
+                std::cout << num;
+            } else {
+                std::cout << ',' << num;
+            }
+        }
+        std::cout << std::endl;
+    }
+
+    return 0;
+}
diff --git a/cs101/stage_2/dh_11_01_change.cpp b/cs101/stage_2/dh_11_01_change.cpp
new file mode 100644
index 0000000..fe53c60
--- /dev/null
+++ b/cs101/stage_2/dh_11_01_change.cpp
@@ -0,0 +1,48 @@
+#include <iostream>
+
+constexpr std::size_t MAX_N = 501;
+constexpr int INF = 0x3f3f3f3f;
+
+using ChangedCoins = std::tuple<int, int, int, int>;
+
+constexpr int calc_coin_amount(const ChangedCoins& coins) {
+    return std::get<0>(coins) + std::get<1>(coins) + std::get<2>(coins) + std::get<3>(coins);
+}
+
+ChangedCoins dp[MAX_N];
+
+
+void init_dp() {
+    for (int i = 1; i < MAX_N; i++) {
+        dp[i] = dp[i - 1], std::get<3>(dp[i])++;
+        if (i - 25 >= 0 && calc_coin_amount(dp[i]) > calc_coin_amount(dp[i - 25])) {
+            dp[i] = dp[i - 25], std::get<0>(dp[i])++;
+        }
+        if (i - 10 >= 0 && calc_coin_amount(dp[i]) > calc_coin_amount(dp[i - 10])) {
+            dp[i] = dp[i - 10], std::get<1>(dp[i])++;
+        }
+        if (i - 5 >= 0 && calc_coin_amount(dp[i]) > calc_coin_amount(dp[i - 5])) {
+            dp[i] = dp[i - 5], std::get<2>(dp[i])++;
+        }
+    }
+}
+
+int main() {
+    std::ios::sync_with_stdio(false);
+    std::cin.tie(nullptr);
+
+    init_dp();
+
+    int cents;
+    std::cin >> cents;
+    for (int i = 1; std::cin >> cents; i++) {
+        std::cout
+            << i << ' '
+            << std::get<0>(dp[cents]) << " QUARTER(S),"
+            << std::get<1>(dp[cents]) << " DIME(S),"
+            << std::get<2>(dp[cents]) << " NICKEL(S),"
+            << std::get<3>(dp[cents]) << " PENNY(S)" << std::endl;
+    }
+
+    return 0;
+}
diff --git a/cs101/stage_2/dh_11_02_shit_num.cpp b/cs101/stage_2/dh_11_02_shit_num.cpp
new file mode 100644
index 0000000..d31fcea
--- /dev/null
+++ b/cs101/stage_2/dh_11_02_shit_num.cpp
@@ -0,0 +1,37 @@
+#include <algorithm>
+#include <iostream>
+
+using IntWithBase = std::string;
+
+IntWithBase dec_to_base(int x, unsigned short base) {
+    IntWithBase result;
+    while (x) {
+        result += static_cast<char>(x % base + '0');
+        x /= base;
+    }
+    std::reverse(result.begin(), result.end());
+    return result;
+}
+
+int main() {
+    std::ios::sync_with_stdio(false);
+    std::cin.tie(nullptr);
+
+    int op;
+    std::cin >> op;
+
+    for (int x = 0; ; x++) {
+        IntWithBase x7 = dec_to_base(x, 7), x9 = dec_to_base(x, 9);
+        if (x7.length() != 3 || x9.length() != 3) { continue; }
+        if (x7[0] == x9[2] && x7[1] == x9[1] && x7[2] == x9[0]) {
+            if (op == 1) {
+                std::cout << x << std::endl;
+            } else {
+                std::cout << (op == 2 ? x7 : x9) << std::endl;
+            }
+            break;
+        }
+    }
+
+    return 0;
+}
diff --git a/cs101/stage_2/dh_11_03_jump_rope.cpp b/cs101/stage_2/dh_11_03_jump_rope.cpp
new file mode 100644
index 0000000..0ae6e76
--- /dev/null
+++ b/cs101/stage_2/dh_11_03_jump_rope.cpp
@@ -0,0 +1,32 @@
+#include <iostream>
+#include <vector>
+
+constexpr int DEFAULT_JUMPS = 60, STOP_PUNISHMENT = 3;
+
+int get_actual_jumps(std::vector<int> counted_jumps) {
+    counted_jumps.push_back(DEFAULT_JUMPS);
+    for (int i = 0; i < counted_jumps.size(); i++) {
+        if (counted_jumps[i] + 3 * i >= DEFAULT_JUMPS - STOP_PUNISHMENT) {
+            return std::min(counted_jumps[i] + STOP_PUNISHMENT * i, DEFAULT_JUMPS)
+                - STOP_PUNISHMENT * i;
+        }
+    }
+    throw std::logic_error("Wrong algorithm");
+}
+
+int main() {
+    std::ios::sync_with_stdio(false);
+    std::cin.tie(nullptr);
+    int n, m;
+    std::cin >> n;
+    for (int _ = 0; _ < n; _++) {
+        std::cin >> m;
+        std::vector<int> counted_jumps(m);
+        for (int i = 0; i < m; i++) {
+            std::cin >> counted_jumps[i];
+        }
+        std::cout << get_actual_jumps(counted_jumps) << std::endl;
+    }
+
+    return 0;
+}
diff --git a/cs101/dh_00_05_sum_fractions.cpp b/cs101/stage_pre/dh_00_05_sum_fractions.cpp
similarity index 100%
rename from cs101/dh_00_05_sum_fractions.cpp
rename to cs101/stage_pre/dh_00_05_sum_fractions.cpp
diff --git a/cs101/dh_00_10_smaller_numbers.cpp b/cs101/stage_pre/dh_00_10_smaller_numbers.cpp
similarity index 100%
rename from cs101/dh_00_10_smaller_numbers.cpp
rename to cs101/stage_pre/dh_00_10_smaller_numbers.cpp
diff --git a/cs101/dh_00_11_count_digits_init.py b/cs101/stage_pre/dh_00_11_count_digits_init.py
similarity index 100%
rename from cs101/dh_00_11_count_digits_init.py
rename to cs101/stage_pre/dh_00_11_count_digits_init.py
diff --git a/cs101/dh_00_12_bottle_exchange.cpp b/cs101/stage_pre/dh_00_12_bottle_exchange.cpp
similarity index 100%
rename from cs101/dh_00_12_bottle_exchange.cpp
rename to cs101/stage_pre/dh_00_12_bottle_exchange.cpp
diff --git a/cs101/dh_00_13_flip.cpp b/cs101/stage_pre/dh_00_13_flip.cpp
similarity index 100%
rename from cs101/dh_00_13_flip.cpp
rename to cs101/stage_pre/dh_00_13_flip.cpp
diff --git a/cs101/dh_00_14_encryption.cpp b/cs101/stage_pre/dh_00_14_encryption.cpp
similarity index 100%
rename from cs101/dh_00_14_encryption.cpp
rename to cs101/stage_pre/dh_00_14_encryption.cpp
diff --git a/cs101/dh_00_15_jusephus.cpp b/cs101/stage_pre/dh_00_15_jusephus.cpp
similarity index 100%
rename from cs101/dh_00_15_jusephus.cpp
rename to cs101/stage_pre/dh_00_15_jusephus.cpp
diff --git a/cs101/dh_00_16_swap_bits.cpp b/cs101/stage_pre/dh_00_16_swap_bits.cpp
similarity index 100%
rename from cs101/dh_00_16_swap_bits.cpp
rename to cs101/stage_pre/dh_00_16_swap_bits.cpp
diff --git a/dp/eagle_egg.cpp b/dp/eagle_egg.cpp
new file mode 100644
index 0000000..bb007e6
--- /dev/null
+++ b/dp/eagle_egg.cpp
@@ -0,0 +1,52 @@
+#include <iostream>
+
+constexpr size_t MAX_HEIGHT = 4e4 + 1, MAX_EGGS = 30, INF = 0x3f3f3f3f;
+int eggs_amount, height;
+
+int dp[MAX_HEIGHT][MAX_EGGS];
+bool ping_pong;
+
+void print_dp(std::ostream& os = std::clog, int h = MAX_HEIGHT - 1) {
+    for (int i = 0; i <= h; i++) {
+        for (int j = 0; j < MAX_EGGS; j++) {
+            os << dp[i][j] << " ";
+        }
+        os << std::endl;
+    }
+}
+
+void init_dp() {
+    for (int i = 0; i < MAX_HEIGHT; i++) {
+        dp[i][1] = i;
+    }
+    for (int h = 1; h < MAX_HEIGHT; h++) {
+        for (int eggs = 2; eggs < MAX_EGGS; eggs++) {
+            int min_value = +INF;
+            for (int i = 1; i <= h; i++) {
+                min_value = std::min(
+                    min_value, std::max(dp[i - 1][eggs - 1], dp[h - i][eggs]));
+            }
+            dp[h][eggs] = min_value + 1;
+            if (eggs >= dp[h][eggs]) {
+                for (int i = eggs; i < MAX_EGGS; i++) { dp[h][i] = dp[h][eggs]; }
+                break;
+            }
+        }
+    }
+    print_dp(std::clog, 100);
+}
+
+int main() {
+    std::ios::sync_with_stdio(false);
+    std::cin.tie(nullptr);
+
+    init_dp();
+    while (std::cin >> height >> eggs_amount && height) {
+        // if (height >= MAX_HEIGHT || eggs_amount >= MAX_EGGS) {
+        //     throw std::overflow_error("Oh no!");
+        // }
+        // if (eggs_amount >= MAX_EGGS) { eggs_amount = MAX_EGGS - 1; }
+        std::cout << dp[height][eggs_amount] << std::endl;
+    }
+    return 0;
+}
diff --git a/dsa/ch2_linear_list/P2629_good_news.cpp b/dsa/ch2_linear_list/P2629_good_news.cpp
new file mode 100644
index 0000000..57f2cad
--- /dev/null
+++ b/dsa/ch2_linear_list/P2629_good_news.cpp
@@ -0,0 +1,60 @@
+#include <iostream>
+
+constexpr int MAX_N = 1e6 + 1;
+int n, ans = 0;
+int values[MAX_N], sums[MAX_N], min_sums[2][MAX_N];
+
+void init_sums() {
+    sums[0] = values[0];
+    for (int i = 1; i < n; i++) {
+        sums[i] = sums[i - 1] + values[i];
+    }
+}
+
+void init_min_sums() {
+    min_sums[0][0] = sums[0];
+    for (int i = 1; i < n; i++) {
+        min_sums[0][i] = std::min(min_sums[0][i - 1], sums[i]);
+    }
+    min_sums[1][n - 1] = sums[n - 1];
+    for (int i = n - 2; i >= 0; i--) {
+        min_sums[1][i] = std::min(min_sums[1][i + 1], sums[i]);
+    }
+}
+
+int main() {
+    std::ios::sync_with_stdio(false);
+    std::cin.tie(nullptr);
+
+    std::cin >> n;
+    for (int i = 0; i < n; i++) {
+        std::cin >> values[i];
+    }
+    init_sums();
+    init_min_sums();
+
+    for (int i = 0; i < n - 1; i++) {
+        int delta1 = sums[i];
+        int delta2 = sums[n - 1] - sums[i];
+        if (min_sums[0][i] + delta2 >= 0 && min_sums[1][i + 1] - delta1 >= 0) {
+            std::clog << i << std::endl;
+            ans++;
+        }
+    }
+
+    bool flag = false;
+    for (int i = 0; i < n; i++) {
+        if (sums[i] < 0) {
+            flag = true;
+            break;
+        }
+    }
+    if (!flag) {
+        std::clog << n - 1 << std::endl;
+        ans++;
+    }
+
+    std::cout << ans << std::endl;
+
+    return 0;
+}
diff --git a/dsa/ch2_linear_list/SDOI2007_queue.cpp b/dsa/ch2_linear_list/SDOI2007_queue.cpp
new file mode 100644
index 0000000..d0785d3
--- /dev/null
+++ b/dsa/ch2_linear_list/SDOI2007_queue.cpp
@@ -0,0 +1,117 @@
+#include <iostream>
+#include <vector>
+
+constexpr int MAX_G = 301;
+
+template <typename NodeT>
+class LinkedList {
+public:
+    NodeT* head = new NodeT();
+    NodeT* tail = head;
+
+    NodeT* push_front(int val) {
+        auto* node = new NodeT{.val = val};
+        push_front(node);
+        return node;
+    }
+
+    void push_front(NodeT* node) {
+        tail->next = node;
+        tail = node;
+    }
+
+    void push_back(NodeT* node) {
+        node->next = head->next;
+        head->next = node;
+    }
+
+    int pop_back() {
+        NodeT* prev_node = head->next;
+        head->next = prev_node->next;
+        if (tail == prev_node) { tail = head; }
+        int val = prev_node->val;
+        delete prev_node;
+        return val;
+    }
+
+    NodeT* back() {
+        return head->next;
+    }
+
+    bool empty() {
+        return head == tail;
+    }
+};
+
+struct Node {
+    int val = -1;
+    Node* next = nullptr;
+    // Node* prev = nullptr;
+};
+
+struct AdvancedNode : Node {
+    using Node::Node;
+    int group{};
+    AdvancedNode* next = nullptr;
+    LinkedList<Node> children;
+};
+
+class AdvancedLinkedList : public LinkedList<AdvancedNode> {
+public:
+    // Node* head = new Node();
+    AdvancedNode* father_nodes[MAX_G] = {};
+
+    AdvancedNode* push_front(int val, int grp) {
+        auto* node = new AdvancedNode();
+        node->val = val, node->group = grp;
+        if (father_nodes[grp] == nullptr) {
+            father_nodes[grp] = node;
+            LinkedList::push_front(node);
+        } else {
+            father_nodes[grp]->children.push_front(node);
+        }
+        return node;
+    }
+
+
+    int pop_back() {
+        if (back()->children.empty()) {
+            father_nodes[back()->group] = nullptr;
+            return LinkedList::pop_back();
+        }
+        int current_val = back()->val;
+        back()->val = back()->children.pop_back();
+        return current_val;
+    }
+};
+
+
+int main() {
+    std::ios::sync_with_stdio(false);
+    std::cin.tie(nullptr);
+
+    int n, groups_amount;
+    std::vector<int> element_groups;
+    AdvancedLinkedList list;
+
+    std::cin >> n >> groups_amount;
+    element_groups.resize(n);
+    for (int i = 0; i < n; i++) {
+        std::cin >> element_groups[i];
+    }
+
+    std::cin >> n;
+    std::string op;
+    int elem_id;
+    for (int _ = 0; _ < n; _++) {
+        std::cin >> op;
+        if (op == "push") {
+            std::cin >> elem_id;
+            list.push_front(elem_id, element_groups[elem_id]);
+        } else {
+            std::cout << list.pop_back() << std::endl;
+        }
+    }
+
+    return 0;
+}
diff --git a/dsa/ch3_stack_queue/USACO12MARs_flowerpot.cpp b/dsa/ch3_stack_queue/USACO12MARs_flowerpot.cpp
new file mode 100644
index 0000000..8a4fc98
--- /dev/null
+++ b/dsa/ch3_stack_queue/USACO12MARs_flowerpot.cpp
@@ -0,0 +1,96 @@
+#include <algorithm>
+#include <iostream>
+#include <map>
+#include <queue>
+
+constexpr int INF = 0x3f3f3f3f;
+
+template <typename T>
+class QueueWithMinMax : public std::queue<T> {
+protected:
+    std::deque<T> min_queue;
+    std::deque<T> max_queue;
+
+public:
+    using std::queue<T>::queue;
+
+    void push(T x) {
+        while (!min_queue.empty() && min_queue.back() > x) {
+            min_queue.pop_back();
+        }
+        min_queue.push_back(x);
+        while (!max_queue.empty() && max_queue.back() < x) {
+            max_queue.pop_back();
+        }
+        max_queue.push_back(x);
+        std::queue<T>::push(x);
+    }
+
+    void pop() {
+        if (!min_queue.empty() && min_queue.front() == std::queue<T>::front()) {
+            min_queue.pop_front();
+        }
+        if (!max_queue.empty() && max_queue.front() == std::queue<T>::front()) {
+            max_queue.pop_front();
+        }
+        std::queue<T>::pop();
+    }
+
+    T get_max() {
+        return max_queue.front();
+    }
+
+    T get_min() {
+        return min_queue.front();
+    }
+
+    auto get_difference() -> decltype(get_max() - get_min()) {
+        if (std::queue<T>::empty()) { return -1; }
+        return get_max() - get_min();
+    }
+};
+
+using Range = std::pair<int, int>;
+using Coord = std::pair<int, int>;
+
+int main() {
+    std::ios::sync_with_stdio(false);
+    std::cin.tie(nullptr);
+
+    int n, target_diff;
+    std::vector<Coord> coords;
+    std::vector<int> positions;
+    std::map<int, Range> moments;
+    // std::vector<Range> moments;
+
+    std::cin >> n >> target_diff;
+    coords.resize(n);
+
+    for (int i = 0; i < n; i++) {
+        // std::cin >> positions[i] >> temp;
+        std::cin >> coords[i].first >> coords[i].second;
+    }
+    std::sort(coords.begin(), coords.end());
+
+    int ans = +INF, p1 = 0, p2 = 0;
+    QueueWithMinMax<int> queue;
+    queue.push(coords[0].second);
+    while (p2 < n) {
+        if (queue.get_difference() < target_diff) {
+            p2++;
+            if (p2 < n) { queue.push(coords[p2].second); }
+        } else {
+            if (coords[p1].first == coords[p2].first) {
+                ans = 0;
+                break;
+            }
+            ans = std::min(ans, coords[p2].first - coords[p1].first);
+            p1++;
+            queue.pop();
+        }
+    }
+    if (ans == +INF) { ans = -1; }
+    std::cout << ans << std::endl;
+
+    return 0;
+}
diff --git a/dsa/ch3_stack_queue/USACO12MARs_flowerpot_WRONG.cpp b/dsa/ch3_stack_queue/USACO12MARs_flowerpot_WRONG.cpp
new file mode 100644
index 0000000..e2a03ae
--- /dev/null
+++ b/dsa/ch3_stack_queue/USACO12MARs_flowerpot_WRONG.cpp
@@ -0,0 +1,87 @@
+#include <algorithm>
+#include <iostream>
+#include <queue>
+
+constexpr int INF = 0x3f3f3f3f;
+
+template <typename T>
+class QueueWithMinMax : public std::queue<T> {
+protected:
+    std::deque<T> min_queue;
+    std::deque<T> max_queue;
+
+public:
+    using std::queue<T>::queue;
+
+    void push(T x) {
+        while (!min_queue.empty() && min_queue.back() > x) {
+            min_queue.pop_back();
+        }
+        min_queue.push_back(x);
+        while (!max_queue.empty() && max_queue.back() < x) {
+            max_queue.pop_back();
+        }
+        max_queue.push_back(x);
+        std::queue<T>::push(x);
+    }
+
+    void pop() {
+        if (!min_queue.empty() && min_queue.front() == std::queue<T>::front()) {
+            min_queue.pop_front();
+        }
+        if (!max_queue.empty() && max_queue.front() == std::queue<T>::front()) {
+            max_queue.pop_front();
+        }
+        std::queue<T>::pop();
+    }
+
+    T get_max() {
+        return max_queue.front();
+    }
+
+    T get_min() {
+        return min_queue.front();
+    }
+
+    auto get_difference() -> decltype(get_max() - get_min()) {
+        if (std::queue<T>::empty()) { return -1; }
+        return get_max() - get_min();
+    }
+};
+
+using Range = std::pair<int, int>;
+
+int main() {
+    std::ios::sync_with_stdio(false);
+    std::cin.tie(nullptr);
+
+    int n, target_diff;
+    std::vector<int> positions;
+    std::vector<Range> moments;
+
+    std::cin >> n >> target_diff;
+    positions.resize(n), moments.assign(n, Range(INF, -INF));
+
+    for (int i = 0; i < n; i++) {
+        int temp;
+        std::cin >> positions[i] >> temp;
+        // moments[i].first = std::min(moments[i].first, temp);
+    }
+
+    int ans = +INF, p1 = 0, p2 = 0;
+    QueueWithMinMax<int> queue;
+    queue.push(moments[0]);
+    while (p2 < n) {
+        if (queue.get_difference() < target_diff) {
+            p2++;
+            if (p2 < n) { queue.push(moments[p2]); }
+        } else {
+            ans = std::min(ans, p2 - p1 + 1);
+            p1++;
+            queue.pop();
+        }
+    }
+    std::cout << ans << std::endl;
+
+    return 0;
+}