From 5d30e847c1bfab84bd609f605c4e2fb649e8f952 Mon Sep 17 00:00:00 2001
From: rogerwang2008 <rogerwang2008@163.com>
Date: Wed, 9 Sep 2026 13:38:11 +0800
Subject: [PATCH] some programs

---
 .idea/editor.xml                              |   1 -
 .idea/workspace.xml                           | 351 ++++++++++++------
 JLOI2009_binary_tree.cpp                      |  87 +++++
 JLOI2009_binary_tree_GIVEUP.cpp               |  64 ++++
 NOIP2016J_bay.cpp                             |  71 ++++
 dp/TJOI2007_walk_segments_dp.cpp              |  64 ++++
 .../NOIP2006S_jinming_budget_dp_knapsack.cpp  |   2 +-
 dsa/linear_list/dsa_0201_dictionary.cpp       |  83 +++++
 .../ECNA2001_sort_letters.cpp                 |   0
 graph/luogu_P3916_graph_iteration.cpp         |  75 ++++
 graph/luogu_P3916_graph_iteration_WRONG.cpp   |  69 ++++
 luogu_P1160_biodir_linked_list.cpp            |  85 +++++
 12 files changed, 828 insertions(+), 124 deletions(-)
 create mode 100644 JLOI2009_binary_tree.cpp
 create mode 100644 JLOI2009_binary_tree_GIVEUP.cpp
 create mode 100644 NOIP2016J_bay.cpp
 create mode 100644 dp/TJOI2007_walk_segments_dp.cpp
 create mode 100644 dsa/linear_list/dsa_0201_dictionary.cpp
 rename noip2012s_kings_game.cpp => graph/ECNA2001_sort_letters.cpp (100%)
 create mode 100644 graph/luogu_P3916_graph_iteration.cpp
 create mode 100644 graph/luogu_P3916_graph_iteration_WRONG.cpp
 create mode 100644 luogu_P1160_biodir_linked_list.cpp

diff --git a/.idea/editor.xml b/.idea/editor.xml
index f86872e..14cdacd 100644
--- a/.idea/editor.xml
+++ b/.idea/editor.xml
@@ -255,7 +255,6 @@
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     <option name="/Default/CodeStyle/CodeFormatting/CppFormatting/EXPORT_DECLARATION_BRACES/@EntryValue" value="END_OF_LINE" type="string" />
-    <option name="/Default/CodeStyle/CodeFormatting/CppFormatting/INDENT_CASE_FROM_SWITCH/@EntryValue" value="true" type="bool" />
     <option name="/Default/CodeStyle/CodeFormatting/CppFormatting/INVOCABLE_DECLARATION_BRACES/@EntryValue" value="END_OF_LINE" type="string" />
     <option name="/Default/CodeStyle/CodeFormatting/CppFormatting/NAMESPACE_DECLARATION_BRACES/@EntryValue" value="END_OF_LINE" type="string" />
     <option name="/Default/CodeStyle/CodeFormatting/CppFormatting/OTHER_BRACES/@EntryValue" value="END_OF_LINE" type="string" />
diff --git a/.idea/workspace.xml b/.idea/workspace.xml
index 1108cee..e596ce6 100644
--- a/.idea/workspace.xml
+++ b/.idea/workspace.xml
@@ -21,15 +21,16 @@
   <component name="CMakeRunConfigurationManager">
     <generated>
       <config projectName="exercises" targetName="pojcs101_M02692_12_coins" />
+      <config projectName="exercises" targetName="graph__ECNA2001_sort_letters" />
       <config projectName="exercises" targetName="pojcs101_T12559_biggest_smallest_combination" />
       <config projectName="exercises" targetName="pojcs101_T12559_biggest_smallest_combination_WRONG" />
       <config projectName="exercises" targetName="pojcs101_E02883" />
       <config projectName="exercises" targetName="pojcs101_M02694_polish_notation_tree" />
-      <config projectName="exercises" targetName="noip2012s_kings_game" />
       <config projectName="exercises" targetName="pojcs101_M01017_6_boxes" />
       <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="_others__qyz__gdbh" />
       <config projectName="exercises" targetName="pojcs101_M03704_brackets" />
       <config projectName="exercises" targetName="luogu_ez_B3628" />
@@ -39,13 +40,16 @@
       <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="graph__luogu_P3916_graph_iteration" />
       <config projectName="exercises" targetName="dp__NOIP1996S_miner_dp_MWASTE" />
       <config projectName="exercises" targetName="pojcs101_T01011_sticks" />
       <config projectName="exercises" targetName="pojcs101_M02431_cows_gas_leak_WRONG" />
       <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="pojcs101_E01003" />
+      <config projectName="exercises" targetName="JLOI2009_binary_tree" />
       <config projectName="exercises" targetName="pojcs101_M03532" />
       <config projectName="exercises" targetName="pojcs101_M01321_chest_grid" />
       <config projectName="exercises" targetName="pojcs101_T04117_split_int" />
@@ -60,10 +64,13 @@
       <config projectName="exercises" targetName="dp__SHOI2002_ski_dp" />
       <config projectName="exercises" targetName="pojcs101_T01011_sticks_WRONG" />
       <config projectName="exercises" targetName="pojcs101_M01852_ants_falling" />
+      <config projectName="exercises" targetName="graph__luogu_P3916_graph_iteration_WRONG" />
       <config projectName="exercises" targetName="SHOI2002_ski_WRONG" />
+      <config projectName="exercises" targetName="dsa__linear_list__dsa_0201_dictionary" />
       <config projectName="exercises" targetName="pojcs101_T27104_chicken_monitors" />
       <config projectName="exercises" targetName="dp__backpack_dp__NOIP2005J_herbs_dp_knapsack_MWASTE_BETTER" />
       <config projectName="exercises" targetName="cmake-build-debug-gcc__CMakeFiles__4.3.1__CompilerIdCXX__CMakeCXXCompilerId" />
+      <config projectName="exercises" targetName="NOIP2016J_bay" />
       <config projectName="exercises" targetName="lc_135_candy" />
       <config projectName="exercises" targetName="pojcs101_T27373_biggest_combination_t2" />
       <config projectName="exercises" targetName="_others__qyz__test" />
@@ -75,30 +82,21 @@
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-      <change afterPath="$PROJECT_DIR$/_others/qyz/gdbh.cpp" afterDir="false" />
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-      <change afterPath="$PROJECT_DIR$/dp/NOIP1996S_miner_dp.cpp" afterDir="false" />
-      <change afterPath="$PROJECT_DIR$/dp/NOIP1996S_miner_dp_MWASTE.cpp" afterDir="false" />
-      <change afterPath="$PROJECT_DIR$/dp/SHOI2002_ski_dp.cpp" afterDir="false" />
+    <list default="true" id="4491295e-723c-4e0b-b7b4-9be1cbde5db8" name="更改" comment="Update CMakeLists.txt">
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+      <change afterPath="$PROJECT_DIR$/NOIP2016J_bay.cpp" afterDir="false" />
       <change afterPath="$PROJECT_DIR$/dp/TJOI2007_walk_segments_dp.cpp" afterDir="false" />
-      <change afterPath="$PROJECT_DIR$/dp/backpack_dp/NOIP2005J_herbs_dp_knapsack.cpp" afterDir="false" />
-      <change afterPath="$PROJECT_DIR$/dp/backpack_dp/NOIP2005J_herbs_dp_knapsack_MWASTE.cpp" afterDir="false" />
-      <change afterPath="$PROJECT_DIR$/dp/backpack_dp/NOIP2005J_herbs_dp_knapsack_MWASTE_BETTER.cpp" afterDir="false" />
-      <change afterPath="$PROJECT_DIR$/dp/backpack_dp/NOIP2005J_herbs_dp_knapsack_PINGPONG.cpp" afterDir="false" />
-      <change afterPath="$PROJECT_DIR$/dp/backpack_dp/NOIP2006S_jinming_budget_dp_knapsack.cpp" afterDir="false" />
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-      <change afterPath="$PROJECT_DIR$/pojcs101_T12559_biggest_smallest_combination_WRONG.cpp" afterDir="false" />
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-      <change afterPath="$PROJECT_DIR$/pojcs101_T27373_biggest_combination_t2_TLE.cpp" afterDir="false" />
+      <change afterPath="$PROJECT_DIR$/dsa/linear_list/dsa_0201_dictionary.cpp" afterDir="false" />
+      <change afterPath="$PROJECT_DIR$/dsa/linear_list/dsa_0202_card_stacking.cpp" afterDir="false" />
+      <change afterPath="$PROJECT_DIR$/graph/ECNA2001_sort_letters.cpp" afterDir="false" />
+      <change afterPath="$PROJECT_DIR$/graph/luogu_P3916_graph_iteration.cpp" afterDir="false" />
+      <change afterPath="$PROJECT_DIR$/graph/luogu_P3916_graph_iteration_WRONG.cpp" afterDir="false" />
+      <change afterPath="$PROJECT_DIR$/luogu_P1160_biodir_linked_list.cpp" afterDir="false" />
+      <change afterPath="$PROJECT_DIR$/practice_of_programming/pp_practise202610a_01.cpp" afterDir="false" />
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-      <change beforePath="$PROJECT_DIR$/pojcs101_M01088_ski.cpp" beforeDir="false" afterPath="$PROJECT_DIR$/SHOI2002_ski.cpp" afterDir="false" />
-      <change beforePath="$PROJECT_DIR$/pojcs101_M01088_ski_WRONG.cpp" beforeDir="false" afterPath="$PROJECT_DIR$/SHOI2002_ski_WRONG.cpp" afterDir="false" />
+      <change beforePath="$PROJECT_DIR$/dp/backpack_dp/NOIP2006S_jinming_budget_dp_knapsack.cpp" beforeDir="false" afterPath="$PROJECT_DIR$/dp/backpack_dp/NOIP2006S_jinming_budget_dp_knapsack.cpp" afterDir="false" />
+      <change beforePath="$PROJECT_DIR$/noip2012s_kings_game.cpp" beforeDir="false" afterPath="$PROJECT_DIR$/JLOI2009_binary_tree.cpp" afterDir="false" />
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@@ -154,93 +152,97 @@
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+    &quot;RunOnceActivity.cidr.known.project.marker&quot;: &quot;true&quot;,
+    &quot;RunOnceActivity.git.unshallow&quot;: &quot;true&quot;,
+    &quot;RunOnceActivity.readMode.enableVisualFormatting&quot;: &quot;true&quot;,
+    &quot;RunOnceActivity.typescript.service.memoryLimit.init&quot;: &quot;true&quot;,
+    &quot;RunOnceActivity.west.config.association.type.startup.service&quot;: &quot;true&quot;,
+    &quot;cf.first.check.clang-format&quot;: &quot;false&quot;,
+    &quot;cidr.known.project.marker&quot;: &quot;true&quot;,
+    &quot;codeWithMe.voiceChat.enabledByDefault&quot;: &quot;false&quot;,
+    &quot;deletionFromPopupRequiresConfirmation&quot;: &quot;false&quot;,
+    &quot;git-widget-placeholder&quot;: &quot;main&quot;,
+    &quot;last_opened_file_path&quot;: &quot;/Users/roger/coding/exercises/graph&quot;,
+    &quot;node.js.detected.package.jshint&quot;: &quot;true&quot;,
+    &quot;node.js.selected.package.jshint&quot;: &quot;&quot;,
+    &quot;nodejs_package_manager_path&quot;: &quot;npm&quot;,
+    &quot;org.rust.first.attach.projects&quot;: &quot;true&quot;,
+    &quot;settings.editor.selected.configurable&quot;: &quot;preferences.sourceCode.C++&quot;
   }
-}]]></component>
+}</component>
   <component name="RecentsManager">
     <key name="CopyFile.RECENT_KEYS">
-      <recent name="$PROJECT_DIR$/dp/backpack_dp" />
+      <recent name="$PROJECT_DIR$/graph" />
       <recent name="$PROJECT_DIR$" />
+      <recent name="$PROJECT_DIR$/dp/backpack_dp" />
     </key>
     <key name="MoveFile.RECENT_KEYS">
+      <recent name="$PROJECT_DIR$/dsa/linear_list" />
       <recent name="$PROJECT_DIR$/dp/backpack_dp" />
       <recent name="$PROJECT_DIR$/_others" />
       <recent name="$PROJECT_DIR$/dp" />
     </key>
   </component>
-  <component name="RunManager" selected="CMake 应用程序.dp__TJOI2007_walk_segments_dp">
-    <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>
+  <component name="RunManager" selected="CMake 应用程序.dsa__linear_list__dsa_0201_dictionary">
     <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">
       <method v="2">
         <option name="BeforeTestRunTask" enabled="true" />
@@ -261,11 +263,26 @@
         <option name="BeforeTestRunTask" enabled="true" />
       </method>
     </configuration>
+    <configuration name="JLOI2009_binary_tree" 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="JLOI2009_binary_tree" CONFIG_NAME="Debug-GCC" RUN_TARGET_PROJECT_NAME="exercises" RUN_TARGET_NAME="JLOI2009_binary_tree">
+      <method v="2">
+        <option name="com.jetbrains.cidr.execution.CidrBuildBeforeRunTaskProvider$BuildBeforeRunTask" enabled="true" />
+      </method>
+    </configuration>
+    <configuration name="JLOI2009_binary_tree_GIVEUP" type="CMakeRunConfiguration" factoryName="Application" REDIRECT_INPUT="false" ELEVATE="false" USE_EXTERNAL_CONSOLE="false" EMULATE_TERMINAL="false" PASS_PARENT_ENVS_2="true" PROJECT_NAME="exercises" TARGET_NAME="JLOI2009_binary_tree_GIVEUP" CONFIG_NAME="Debug-GCC" RUN_TARGET_PROJECT_NAME="exercises" RUN_TARGET_NAME="JLOI2009_binary_tree_GIVEUP">
+      <method v="2">
+        <option name="com.jetbrains.cidr.execution.CidrBuildBeforeRunTaskProvider$BuildBeforeRunTask" enabled="true" />
+      </method>
+    </configuration>
     <configuration name="NOIP2003J_bigint" 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="NOIP2003J_bigint" CONFIG_NAME="Debug-GCC" RUN_TARGET_PROJECT_NAME="exercises" RUN_TARGET_NAME="NOIP2003J_bigint">
       <method v="2">
         <option name="com.jetbrains.cidr.execution.CidrBuildBeforeRunTaskProvider$BuildBeforeRunTask" enabled="true" />
       </method>
     </configuration>
+    <configuration name="NOIP2016J_bay" type="CMakeRunConfiguration" factoryName="Application" REDIRECT_INPUT="false" ELEVATE="false" USE_EXTERNAL_CONSOLE="false" EMULATE_TERMINAL="false" PASS_PARENT_ENVS_2="true" PROJECT_NAME="exercises" TARGET_NAME="NOIP2016J_bay" CONFIG_NAME="Debug-GCC" RUN_TARGET_PROJECT_NAME="exercises" RUN_TARGET_NAME="NOIP2016J_bay">
+      <method v="2">
+        <option name="com.jetbrains.cidr.execution.CidrBuildBeforeRunTaskProvider$BuildBeforeRunTask" enabled="true" />
+      </method>
+    </configuration>
     <configuration name="SHOI2002_ski" 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="SHOI2002_ski" CONFIG_NAME="Debug-GCC" RUN_TARGET_PROJECT_NAME="exercises" RUN_TARGET_NAME="SHOI2002_ski">
       <method v="2">
         <option name="com.jetbrains.cidr.execution.CidrBuildBeforeRunTaskProvider$BuildBeforeRunTask" enabled="true" />
@@ -336,11 +353,36 @@
         <option name="com.jetbrains.cidr.execution.CidrBuildBeforeRunTaskProvider$BuildBeforeRunTask" enabled="true" />
       </method>
     </configuration>
+    <configuration name="dsa__linear_list__dsa_0201_dictionary" 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="dsa__linear_list__dsa_0201_dictionary" CONFIG_NAME="Debug-GCC" RUN_TARGET_PROJECT_NAME="exercises" RUN_TARGET_NAME="dsa__linear_list__dsa_0201_dictionary">
+      <method v="2">
+        <option name="com.jetbrains.cidr.execution.CidrBuildBeforeRunTaskProvider$BuildBeforeRunTask" enabled="true" />
+      </method>
+    </configuration>
+    <configuration name="graph__ECNA2001_sort_letters" type="CMakeRunConfiguration" factoryName="Application" REDIRECT_INPUT="false" ELEVATE="false" USE_EXTERNAL_CONSOLE="false" EMULATE_TERMINAL="false" PASS_PARENT_ENVS_2="true" PROJECT_NAME="exercises" TARGET_NAME="graph__ECNA2001_sort_letters" CONFIG_NAME="Debug-GCC" RUN_TARGET_PROJECT_NAME="exercises" RUN_TARGET_NAME="graph__ECNA2001_sort_letters">
+      <method v="2">
+        <option name="com.jetbrains.cidr.execution.CidrBuildBeforeRunTaskProvider$BuildBeforeRunTask" enabled="true" />
+      </method>
+    </configuration>
+    <configuration name="graph__luogu_P3916_graph_iteration" 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="graph__luogu_P3916_graph_iteration" CONFIG_NAME="Debug-GCC" RUN_TARGET_PROJECT_NAME="exercises" RUN_TARGET_NAME="graph__luogu_P3916_graph_iteration">
+      <method v="2">
+        <option name="com.jetbrains.cidr.execution.CidrBuildBeforeRunTaskProvider$BuildBeforeRunTask" enabled="true" />
+      </method>
+    </configuration>
+    <configuration name="graph__luogu_P3916_graph_iteration_WRONG" type="CMakeRunConfiguration" factoryName="Application" REDIRECT_INPUT="false" ELEVATE="false" USE_EXTERNAL_CONSOLE="false" EMULATE_TERMINAL="false" PASS_PARENT_ENVS_2="true" PROJECT_NAME="exercises" TARGET_NAME="graph__luogu_P3916_graph_iteration_WRONG" CONFIG_NAME="Debug-GCC" RUN_TARGET_PROJECT_NAME="exercises" RUN_TARGET_NAME="graph__luogu_P3916_graph_iteration_WRONG">
+      <method v="2">
+        <option name="com.jetbrains.cidr.execution.CidrBuildBeforeRunTaskProvider$BuildBeforeRunTask" enabled="true" />
+      </method>
+    </configuration>
     <configuration name="lc_135_candy" 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="lc_135_candy" CONFIG_NAME="Debug-GCC" RUN_TARGET_PROJECT_NAME="exercises" RUN_TARGET_NAME="lc_135_candy">
       <method v="2">
         <option name="com.jetbrains.cidr.execution.CidrBuildBeforeRunTaskProvider$BuildBeforeRunTask" enabled="true" />
       </method>
     </configuration>
+    <configuration name="luogu_P1160_biodir_linked_list" type="CMakeRunConfiguration" factoryName="Application" REDIRECT_INPUT="false" ELEVATE="false" USE_EXTERNAL_CONSOLE="false" EMULATE_TERMINAL="false" PASS_PARENT_ENVS_2="true" PROJECT_NAME="exercises" TARGET_NAME="luogu_P1160_biodir_linked_list" CONFIG_NAME="Debug-GCC" RUN_TARGET_PROJECT_NAME="exercises" RUN_TARGET_NAME="luogu_P1160_biodir_linked_list">
+      <method v="2">
+        <option name="com.jetbrains.cidr.execution.CidrBuildBeforeRunTaskProvider$BuildBeforeRunTask" enabled="true" />
+      </method>
+    </configuration>
     <configuration name="luogu_ez_B3628" 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="luogu_ez_B3628" CONFIG_NAME="Debug-GCC" RUN_TARGET_PROJECT_NAME="exercises" RUN_TARGET_NAME="luogu_ez_B3628">
       <method v="2">
         <option name="com.jetbrains.cidr.execution.CidrBuildBeforeRunTaskProvider$BuildBeforeRunTask" enabled="true" />
@@ -351,11 +393,6 @@
         <option name="com.jetbrains.cidr.execution.CidrBuildBeforeRunTaskProvider$BuildBeforeRunTask" enabled="true" />
       </method>
     </configuration>
-    <configuration name="noip2012s_kings_game" 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="noip2012s_kings_game" CONFIG_NAME="Debug-GCC" RUN_TARGET_PROJECT_NAME="exercises" RUN_TARGET_NAME="noip2012s_kings_game">
-      <method v="2">
-        <option name="com.jetbrains.cidr.execution.CidrBuildBeforeRunTaskProvider$BuildBeforeRunTask" enabled="true" />
-      </method>
-    </configuration>
     <configuration name="pojcs101_E01003" type="CMakeRunConfiguration" factoryName="Application" REDIRECT_INPUT="false" ELEVATE="false" USE_EXTERNAL_CONSOLE="false" EMULATE_TERMINAL="false" PASS_PARENT_ENVS_2="true" PROJECT_NAME="exercises" TARGET_NAME="pojcs101_E01003" CONFIG_NAME="Debug-GCC" RUN_TARGET_PROJECT_NAME="exercises" RUN_TARGET_NAME="pojcs101_E01003">
       <method v="2">
         <option name="com.jetbrains.cidr.execution.CidrBuildBeforeRunTaskProvider$BuildBeforeRunTask" enabled="true" />
@@ -564,11 +601,18 @@
       <item itemvalue="CMake 应用程序.dp__NOIP1996S_miner_dp_MWASTE" />
       <item itemvalue="CMake 应用程序.dp__SHOI2002_ski_dp" />
       <item itemvalue="CMake 应用程序.dp__TJOI2007_walk_segments_dp" />
+      <item itemvalue="CMake 应用程序.dsa__linear_list__dsa_0201_dictionary" />
+      <item itemvalue="CMake 应用程序.graph__ECNA2001_sort_letters" />
+      <item itemvalue="CMake 应用程序.graph__luogu_P3916_graph_iteration" />
+      <item itemvalue="CMake 应用程序.graph__luogu_P3916_graph_iteration_WRONG" />
+      <item itemvalue="CMake 应用程序.JLOI2009_binary_tree" />
+      <item itemvalue="CMake 应用程序.JLOI2009_binary_tree_GIVEUP" />
       <item itemvalue="CMake 应用程序.lc_135_candy" />
       <item itemvalue="CMake 应用程序.luogu_ez_B3628" />
+      <item itemvalue="CMake 应用程序.luogu_P1160_biodir_linked_list" />
       <item itemvalue="CMake 应用程序.luogu_template_dsu_P3367" />
       <item itemvalue="CMake 应用程序.NOIP2003J_bigint" />
-      <item itemvalue="CMake 应用程序.noip2012s_kings_game" />
+      <item itemvalue="CMake 应用程序.NOIP2016J_bay" />
       <item itemvalue="CMake 应用程序.pojcs101_E01003" />
       <item itemvalue="CMake 应用程序.pojcs101_E01218" />
       <item itemvalue="CMake 应用程序.pojcs101_E02883" />
@@ -605,37 +649,79 @@
     </list>
     <recent_temporary>
       <list>
-        <item itemvalue="Python.noi2001_food_chain_dsu" />
         <item itemvalue="Python.pojcs101_M03247_palindromic_prime_init1" />
+        <item itemvalue="Python.noi2001_food_chain_dsu" />
       </list>
     </recent_temporary>
   </component>
-  <component name="SelectedDebugProfileService"><![CDATA[{
-  "profileIdByStamp": [
+  <component name="SelectedDebugProfileService">{
+  &quot;profileIdByStamp&quot;: [
     {
-      "first": {
-        "##RUN_CONFIGURATION##": "CMake 应用程序._others__qyzgdbh",
-        "cmake": "CMakeBuildProfile:Debug-GCC"
+      &quot;first&quot;: {
+        &quot;##RUN_CONFIGURATION##&quot;: &quot;CMake 应用程序.JLOI2009_binary_tree&quot;,
+        &quot;cmake&quot;: &quot;CMakeBuildProfile:Debug-GCC&quot;
       },
-      "second": "2c1c9069-eeff-46e4-9092-db62e2b1ded5"
+      &quot;second&quot;: &quot;2c1c9069-eeff-46e4-9092-db62e2b1ded5&quot;
     },
     {
-      "first": {
-        "##RUN_CONFIGURATION##": "CMake 应用程序.NOIP2003J_bigint",
-        "cmake": "CMakeBuildProfile:Debug-GCC"
+      &quot;first&quot;: {
+        &quot;##RUN_CONFIGURATION##&quot;: &quot;CMake 应用程序._others__qyz__gdbh&quot;,
+        &quot;cmake&quot;: &quot;CMakeBuildProfile:Debug-GCC&quot;
       },
-      "second": "2c1c9069-eeff-46e4-9092-db62e2b1ded5"
+      &quot;second&quot;: &quot;2c1c9069-eeff-46e4-9092-db62e2b1ded5&quot;
     },
     {
-      "first": {
-        "##RUN_CONFIGURATION##": "CMake 应用程序.pojcs101_T27373_biggest_combination_t2",
-        "cmake": "CMakeBuildProfile:Debug-GCC"
+      &quot;first&quot;: {
+        &quot;##RUN_CONFIGURATION##&quot;: &quot;CMake 应用程序.dp__TJOI2007_walk_segments_dp&quot;,
+        &quot;cmake&quot;: &quot;CMakeBuildProfile:Debug-GCC&quot;
       },
-      "second": "2c1c9069-eeff-46e4-9092-db62e2b1ded5"
+      &quot;second&quot;: &quot;2c1c9069-eeff-46e4-9092-db62e2b1ded5&quot;
+    },
+    {
+      &quot;first&quot;: {
+        &quot;##RUN_CONFIGURATION##&quot;: &quot;CMake 应用程序.luogu_P1160_biodir_linked_list&quot;,
+        &quot;cmake&quot;: &quot;CMakeBuildProfile:Debug-GCC&quot;
+      },
+      &quot;second&quot;: &quot;2c1c9069-eeff-46e4-9092-db62e2b1ded5&quot;
+    },
+    {
+      &quot;first&quot;: {
+        &quot;##RUN_CONFIGURATION##&quot;: &quot;CMake 应用程序.NOIP2016J_bay&quot;,
+        &quot;cmake&quot;: &quot;CMakeBuildProfile:Debug-GCC&quot;
+      },
+      &quot;second&quot;: &quot;2c1c9069-eeff-46e4-9092-db62e2b1ded5&quot;
+    },
+    {
+      &quot;first&quot;: {
+        &quot;##RUN_CONFIGURATION##&quot;: &quot;CMake 应用程序.graph__luogu_P3916_graph_iteration&quot;,
+        &quot;cmake&quot;: &quot;CMakeBuildProfile:Debug-GCC&quot;
+      },
+      &quot;second&quot;: &quot;2c1c9069-eeff-46e4-9092-db62e2b1ded5&quot;
+    },
+    {
+      &quot;first&quot;: {
+        &quot;##RUN_CONFIGURATION##&quot;: &quot;CMake 应用程序.dsa__linear_list__dsa_0201_dictionary&quot;,
+        &quot;cmake&quot;: &quot;CMakeBuildProfile:Debug-GCC&quot;
+      },
+      &quot;second&quot;: &quot;2c1c9069-eeff-46e4-9092-db62e2b1ded5&quot;
+    },
+    {
+      &quot;first&quot;: {
+        &quot;##RUN_CONFIGURATION##&quot;: &quot;CMake 应用程序.NOIP2003J_bigint&quot;,
+        &quot;cmake&quot;: &quot;CMakeBuildProfile:Debug-GCC&quot;
+      },
+      &quot;second&quot;: &quot;2c1c9069-eeff-46e4-9092-db62e2b1ded5&quot;
+    },
+    {
+      &quot;first&quot;: {
+        &quot;##RUN_CONFIGURATION##&quot;: &quot;CMake 应用程序.pojcs101_T27373_biggest_combination_t2&quot;,
+        &quot;cmake&quot;: &quot;CMakeBuildProfile:Debug-GCC&quot;
+      },
+      &quot;second&quot;: &quot;2c1c9069-eeff-46e4-9092-db62e2b1ded5&quot;
     }
   ],
-  "modificationCount": 49
-}]]></component>
+  &quot;modificationCount&quot;: 69
+}</component>
   <component name="SharedIndexes">
     <attachedChunks>
       <set>
@@ -670,7 +756,8 @@
   <component name="VcsManagerConfiguration">
     <MESSAGE value="CMakeLists.txt" />
     <MESSAGE value="1" />
-    <option name="LAST_COMMIT_MESSAGE" value="1" />
+    <MESSAGE value="Update CMakeLists.txt" />
+    <option name="LAST_COMMIT_MESSAGE" value="Update CMakeLists.txt" />
   </component>
   <component name="XDebuggerManager">
     <breakpoint-manager>
@@ -685,8 +772,28 @@
           <line>32</line>
           <option name="timeStamp" value="15" />
         </line-breakpoint>
+        <line-breakpoint enabled="true" type="com.jetbrains.cidr.execution.debugger.OCBreakpointType">
+          <url>file://$PROJECT_DIR$/dp/TJOI2007_walk_segments_dp.cpp</url>
+          <line>35</line>
+          <option name="timeStamp" value="24" />
+        </line-breakpoint>
+        <line-breakpoint enabled="true" type="com.jetbrains.cidr.execution.debugger.OCBreakpointType">
+          <url>file://$PROJECT_DIR$/dp/TJOI2007_walk_segments_dp.cpp</url>
+          <line>45</line>
+          <option name="timeStamp" value="25" />
+        </line-breakpoint>
+        <line-breakpoint enabled="true" type="com.jetbrains.cidr.execution.debugger.OCBreakpointType">
+          <url>file://$PROJECT_DIR$/graph/luogu_P3916_graph_iteration.cpp</url>
+          <line>66</line>
+          <option name="timeStamp" value="36" />
+        </line-breakpoint>
       </breakpoints>
     </breakpoint-manager>
+    <watches-manager>
+      <configuration name="CMakeRunConfiguration">
+        <watch expression="ans_cache" language="C++" />
+      </configuration>
+    </watches-manager>
   </component>
   <component name="XSLT-Support.FileAssociations.UIState">
     <expand />
diff --git a/JLOI2009_binary_tree.cpp b/JLOI2009_binary_tree.cpp
new file mode 100644
index 0000000..becdd98
--- /dev/null
+++ b/JLOI2009_binary_tree.cpp
@@ -0,0 +1,87 @@
+#include <iostream>
+#include <vector>
+#include <cassert>
+
+using namespace std;
+
+class Graph {
+public:
+    struct Node {
+        vector<int> neighbors;
+        int father = -1;
+        int depth = -1;
+    };
+
+    vector<Node> nodes;
+    int depth = -1, breadth = -1;
+
+    void connect(int x, int y) {
+        assert(x < nodes.size() && y < nodes.size());
+        nodes[x].neighbors.push_back(y);
+        nodes[y].neighbors.push_back(x);
+    }
+
+    void init_tree() {
+        vector<int> depths_map;
+        init_tree(0, 0, depths_map);
+        depth = depths_map.size();
+        breadth = -1;
+        for (const auto& d : depths_map) {
+            breadth = max(breadth, d);
+        }
+    }
+
+    void init_tree(int node_idx, int current_depth, vector<int>& depths_map) {
+        if (depths_map.size() <= current_depth) { depths_map.push_back(0); }
+        depths_map[current_depth]++;
+        for (const auto& neighbor : nodes[node_idx].neighbors) {
+            if (neighbor == nodes[node_idx].father) { continue; }
+            nodes[neighbor].father = node_idx;
+            nodes[neighbor].depth = current_depth + 1;
+            init_tree(neighbor, current_depth + 1, depths_map);
+        }
+    }
+
+    int get_cost(int start, int end) {
+        int cost = 0;
+        while (nodes[start].depth > nodes[end].depth) {
+            cost += 2;
+            start = nodes[start].father;
+        }
+        while (nodes[start].depth < nodes[end].depth) {
+            cost += 1;
+            end = nodes[end].father;
+        }
+        while (start != end) {
+            cost += 3;
+            start = nodes[start].father;
+            end = nodes[end].father;
+        }
+        return cost;
+    }
+};
+
+
+Graph tree;
+int n;
+
+int main() {
+    ios::sync_with_stdio(false);
+    cin.tie(nullptr);
+
+    int x, y;
+
+    cin >> n;
+    tree.nodes.resize(n);
+    for (int _ = 1; _ < n; _++) {
+        cin >> x >> y;
+        tree.connect(x - 1, y - 1);
+    }
+    tree.init_tree();
+    cout << tree.depth << endl << tree.breadth << endl;
+
+    cin >> x >> y;
+    cout << tree.get_cost(x - 1, y - 1) << endl;
+
+    return 0;
+}
diff --git a/JLOI2009_binary_tree_GIVEUP.cpp b/JLOI2009_binary_tree_GIVEUP.cpp
new file mode 100644
index 0000000..cb320ea
--- /dev/null
+++ b/JLOI2009_binary_tree_GIVEUP.cpp
@@ -0,0 +1,64 @@
+#include <iostream>
+#include <vector>
+#include <cassert>
+
+using namespace std;
+
+class BinaryTree {
+public:
+    struct Node {
+        int left = -1, right = -1, father = -1;
+    };
+
+    vector<Node> nodes;
+
+    int depth = -1, breadth = -1;
+
+    void connect(int father, int son) {
+        assert(father < nodes.size() && son < nodes.size());
+        if (nodes[son].father != -1 && nodes[father].father == -1) { swap(father, son); }
+        nodes[son].father = father;
+        if (nodes[father].left == -1) {
+            nodes[father].left = son;
+        } else {
+            nodes[father].right = son;
+        }
+    }
+
+    void dfs() {
+        depth = -1, breadth = -1;
+        vector<int> depths_map;
+        dfs(0, 0, depths_map);
+        for (const int d : depths_map) {
+            breadth = max(breadth, d);
+        }
+    }
+
+    void dfs(int node_idx, int _depth, vector<int>& depths_map) {
+        depth = max(depth, _depth);
+        if (_depth >= depths_map.size()) {
+            depths_map.push_back(0);
+        }
+        depths_map[_depth]++;
+        if (nodes[node_idx].left != -1) {
+            dfs(nodes[node_idx].left, _depth + 1, depths_map);
+        }
+        if (nodes[node_idx].right != -1) {
+            dfs(nodes[node_idx].right, _depth + 1, depths_map);
+        }
+    }
+};
+
+BinaryTree tree;
+int n;
+
+int main() {
+    ios::sync_with_stdio(false);
+    cin.tie(nullptr);
+
+    cin >> n;
+    tree.nodes.resize(n);
+
+
+    return 0;
+}
diff --git a/NOIP2016J_bay.cpp b/NOIP2016J_bay.cpp
new file mode 100644
index 0000000..7a2ba9c
--- /dev/null
+++ b/NOIP2016J_bay.cpp
@@ -0,0 +1,71 @@
+/*
+ * 在线处理？
+ */
+
+#include <iostream>
+#include <unordered_map>
+#include <vector>
+
+using namespace std;
+
+using Boat = pair<int, vector<int>>;
+
+constexpr int MAX_N = 1e5 + 5, DAY_TIME = 86400;
+
+vector<Boat> boats;
+unordered_map<int, int> nations_statistics;
+int start_time = -DAY_TIME, current_time = 0, pointer = 0, nations_count;
+
+void modify_nations_statistics(vector<int> people, int multiplier = 1) {
+    for (int nation : people) {
+        if (nations_statistics[nation] == 0) { nations_count++; }
+        nations_statistics[nation] += multiplier;
+        if (nations_statistics[nation] == 0) { nations_count--; }
+    }
+}
+
+int count_nations() {
+    // int ans = 0;
+    // for (auto& [nation, count] : nations_statistics) {
+    //     if (count > 0) { ans++; }
+    // }
+    // return ans;
+    return nations_count;
+}
+
+int main() {
+    ios::sync_with_stdio(false);
+    cin.tie(nullptr);
+
+    int n;
+    cin >> n;
+    for (int i = 0; i < n; i++) {
+        int arrival_time, people_amount;
+        cin >> arrival_time >> people_amount;
+        boats.emplace_back(arrival_time, vector<int>(people_amount));
+        for (int j = 0; j < people_amount; j++) {
+            cin >> boats.back().second[j];
+        }
+        // ONLINE
+        modify_nations_statistics(boats.back().second);
+        start_time = arrival_time - DAY_TIME;
+        while (pointer < boats.size() && boats[pointer].first <= start_time) {
+            modify_nations_statistics(boats[pointer].second, -1);
+            pointer++;
+        }
+        cout << count_nations() << endl;
+    }
+
+    // for (int i = 0, j = 0; i < boats.size(); i++) {
+    //     current_time = boats[i].first + DAY_TIME;
+    //     // modify_nations_statistics(boats[i].second);
+    //     while (j < boats.size() && boats[j].first <= current_time) {
+    //         modify_nations_statistics(boats[j].second);
+    //         j++;
+    //     }
+    //     cout << count_nations() << endl;
+    //     modify_nations_statistics(boats[i].second, -1);
+    // }
+
+    return 0;
+}
diff --git a/dp/TJOI2007_walk_segments_dp.cpp b/dp/TJOI2007_walk_segments_dp.cpp
new file mode 100644
index 0000000..f1148a0
--- /dev/null
+++ b/dp/TJOI2007_walk_segments_dp.cpp
@@ -0,0 +1,64 @@
+#include <iostream>
+
+using namespace std;
+
+using Segment = pair<int, int>;
+
+constexpr int MAX_N = 20005;
+int n;
+Segment segments[MAX_N];
+
+pair<int, int> dp[MAX_N]; // 从这一层的线段左/右边出去
+
+void log_dp() {
+    for (int i = 0; i < n; i++) {
+        clog << dp[i].first << "\t" << dp[i].second << endl;
+    }
+}
+
+pair<int, int> get_min_steps(const Segment& segment, const int start_pos) {
+    const int len = segment.second - segment.first;
+    if (start_pos <= segment.first) {
+        return {segment.second - start_pos + len, segment.second - start_pos};
+    }
+    if (start_pos >= segment.second) {
+        return {start_pos - segment.first, start_pos - segment.first + len};
+    }
+    return {
+        len + (segment.second - start_pos),
+        len + (start_pos - segment.first)
+    };
+}
+
+// pair<int, int> get_min_steps(const Segment& segment, const Segment& previous_segment) {
+//     auto [first1, second1] = get_min_steps(segment, previous_segment.second);
+//     auto [first2, second2] = get_min_steps(segment, previous_segment.first);
+//     return {min(first1, first2), min(second1, second2)};
+// }
+
+int solve_dp() {
+    dp[0] = get_min_steps(segments[0], 1);
+    for (int i = 1; i < n; i++) {
+        auto [first1, second1] = get_min_steps(segments[i], segments[i - 1].first);
+        auto [first2, second2] = get_min_steps(segments[i], segments[i - 1].second);
+        first1 += dp[i - 1].first, second1 += dp[i - 1].first;
+        first2 += dp[i - 1].second, second2 += dp[i - 1].second;
+        dp[i] = {min(first1, first2), min(second1, second2)};
+    }
+    return min(dp[n - 1].first, dp[n - 1].second);
+}
+
+int main() {
+    ios::sync_with_stdio(false);
+    cin.tie(nullptr);
+
+    cin >> n;
+    for (int i = 0; i < n; i++) {
+        cin >> segments[i].first >> segments[i].second;
+    }
+    segments[n] = {n, n}, n++;
+    cout << solve_dp() + n - 2 << endl;
+    log_dp();
+
+    return 0;
+}
diff --git a/dp/backpack_dp/NOIP2006S_jinming_budget_dp_knapsack.cpp b/dp/backpack_dp/NOIP2006S_jinming_budget_dp_knapsack.cpp
index 596118b..e195ae8 100644
--- a/dp/backpack_dp/NOIP2006S_jinming_budget_dp_knapsack.cpp
+++ b/dp/backpack_dp/NOIP2006S_jinming_budget_dp_knapsack.cpp
@@ -50,7 +50,7 @@ vector<FlatItem> generate_flat_items(OriginalItem item) {
 void solve_dp() {
     for (int i = 0; i < n; i++) {
         if (items[i].item.value == -1) { continue; }
-        for (int w=capacity; w>=1; w--) {
+        for (int w = capacity; w >= 1; w--) {
             // dp[w] = dp[w] // 不买
             for (const auto& [weight, value] : generate_flat_items(items[i])) {
                 if (w >= weight) {
diff --git a/dsa/linear_list/dsa_0201_dictionary.cpp b/dsa/linear_list/dsa_0201_dictionary.cpp
new file mode 100644
index 0000000..b2c8219
--- /dev/null
+++ b/dsa/linear_list/dsa_0201_dictionary.cpp
@@ -0,0 +1,83 @@
+#include <cassert>
+#include <iostream>
+#include <vector>
+
+using namespace std;
+
+vector<string> words;
+
+string deleted_char(const string& word, const int idx) {
+    assert(0 <= idx && idx < word.size());
+    return word.substr(0, idx) + word.substr(idx + 1);
+}
+
+vector<string> query(const string& s) {
+    vector<string> results;
+    for (string word : words) {
+        switch (static_cast<int>(word.size()) - static_cast<int>(s.size())) {
+        case 1: { // 需要删
+            for (int i = 0; i < word.size(); i++) {
+                if (word[i] != s[i]) {
+                    if (deleted_char(word, i) == s) {
+                        results.push_back(word);
+                        break;
+                    }
+                }
+            }
+            break;
+        }
+        case -1: {
+            for (int i = 0; i < s.size(); i++) {
+                if (word[i] != s[i]) {
+                    if (deleted_char(s, i) == word) {
+                        results.push_back(word);
+                        break;
+                    }
+                }
+            }
+            break;
+        }
+        case 0: {
+            if (word == s) { return vector{word}; }
+            int diff_count = 0;
+            for (int i = 0; i < s.size(); i++) {
+                if (word[i] != s[i]) {
+                    diff_count++;
+                }
+                if (diff_count > 1) { break; }
+            }
+            if (diff_count == 1) {
+                results.push_back(word);
+                break;
+            }
+            break;
+        }
+        default: break;
+        }
+    }
+    return results;
+}
+
+int main() {
+    ios::sync_with_stdio(false);
+    cin.tie(nullptr);
+
+    string s;
+    while (cin >> s && s[0] != '#') {
+        words.push_back(s);
+    }
+    while (cin >> s && s[0] != '#') {
+        vector<string> results = query(s);
+        if (!results.empty() && results[0] == s) {
+            cout << s << " is correct" << endl;
+            continue;
+        }
+        cout << s << ": ";
+        for (const string& result : results) {
+            cout << result << " ";
+        }
+        cout << endl;
+    }
+
+    return 0;
+}
diff --git a/noip2012s_kings_game.cpp b/graph/ECNA2001_sort_letters.cpp
similarity index 100%
rename from noip2012s_kings_game.cpp
rename to graph/ECNA2001_sort_letters.cpp
diff --git a/graph/luogu_P3916_graph_iteration.cpp b/graph/luogu_P3916_graph_iteration.cpp
new file mode 100644
index 0000000..6a32c6f
--- /dev/null
+++ b/graph/luogu_P3916_graph_iteration.cpp
@@ -0,0 +1,75 @@
+#include <cstring>
+#include <iostream>
+#include <vector>
+
+using namespace std;
+
+class Graph {
+public:
+    using VertexId = int;
+    using EdgeId = int;
+
+    struct Edge {
+        VertexId target_vertex = -1;
+        EdgeId next_edge = -1;
+    };
+
+    vector<Edge> edges;
+    vector<EdgeId> first_edges;
+
+    explicit Graph(int vertices_amount, int edges_amount = 0) : first_edges(vertices_amount, -1) {
+        edges.reserve(edges_amount);
+    }
+
+    void add_edge(VertexId source_vertex, VertexId target_vertex) {
+        const EdgeId edge_id = edges.size();
+        edges.push_back({.target_vertex = target_vertex, .next_edge = first_edges[source_vertex]}); // 所以遍历顺序相反！
+        first_edges[source_vertex] = edge_id;
+    }
+};
+
+constexpr int MAX_V = 1e5 + 5;
+
+int v, e;
+int ans_cache[MAX_V];
+
+int dfs(const Graph& graph, int vertex, int start_vertex) {
+    if (ans_cache[vertex] != -1) { return ans_cache[vertex]; }
+    ans_cache[vertex] = start_vertex;
+    for (int edge_id = graph.first_edges[vertex]; edge_id != -1; edge_id = graph.edges[edge_id].next_edge) {
+        dfs(graph, graph.edges[edge_id].target_vertex, start_vertex);
+    }
+    return ans_cache[vertex];
+}
+
+int dfs(const Graph& graph, int vertex) {
+    // 反向建图，从大到小 dfs
+    return dfs(graph, vertex, vertex);
+}
+
+int main() {
+    ios::sync_with_stdio(false);
+    cin.tie(nullptr);
+
+    cin >> v >> e;
+
+    Graph graph(v, e);
+
+    for (int _ = 0; _ < e; _++) {
+        int x, y;
+        cin >> x >> y;
+        graph.add_edge(y - 1, x - 1); // Reversed graph
+    }
+
+    memset(ans_cache, -1, sizeof(ans_cache));
+
+    for (int vertex = v - 1; vertex >= 0; vertex--) {
+        dfs(graph, vertex);
+    }
+    for (int vertex = 0; vertex < v; vertex++) {
+        cout << ans_cache[vertex] + 1 << " ";
+    }
+    cout << endl;
+
+    return 0;
+}
diff --git a/graph/luogu_P3916_graph_iteration_WRONG.cpp b/graph/luogu_P3916_graph_iteration_WRONG.cpp
new file mode 100644
index 0000000..9185417
--- /dev/null
+++ b/graph/luogu_P3916_graph_iteration_WRONG.cpp
@@ -0,0 +1,69 @@
+#include <cstring>
+#include <iostream>
+#include <vector>
+
+using namespace std;
+
+class Graph {
+public:
+    using VertexId = int;
+    using EdgeId = int;
+
+    struct Edge {
+        VertexId target_vertex = -1;
+        EdgeId next_edge = -1;
+    };
+
+    vector<Edge> edges;
+    vector<EdgeId> first_edges;
+
+    explicit Graph(int vertices_amount, int edges_amount = 0) : first_edges(vertices_amount, -1) {
+        edges.reserve(edges_amount);
+    }
+
+    void add_edge(VertexId source_vertex, VertexId target_vertex) {
+        const EdgeId edge_id = edges.size();
+        edges.push_back({.target_vertex = target_vertex, .next_edge = first_edges[source_vertex]}); // 所以遍历顺序相反！
+        first_edges[source_vertex] = edge_id;
+    }
+};
+
+constexpr int MAX_V = 1e5 + 5;
+
+int v, e;
+int ans_cache[MAX_V];
+
+int dfs(const Graph& graph, int vertex) {
+    // 如果从小到大 dfs，是不需要在此处取 max 的
+    if (ans_cache[vertex] != -1) { return ans_cache[vertex]; }
+    ans_cache[vertex] = vertex;
+    if (graph.first_edges[vertex] == -1) { return ans_cache[vertex]; }
+    for (int edge_id = graph.first_edges[vertex]; edge_id != -1; edge_id = graph.edges[edge_id].next_edge) {
+        ans_cache[vertex] = max(ans_cache[vertex], dfs(graph, graph.edges[edge_id].target_vertex));
+    }
+    return ans_cache[vertex];
+}
+
+int main() {
+    ios::sync_with_stdio(false);
+    cin.tie(nullptr);
+
+    cin >> v >> e;
+
+    Graph graph(v, e);
+
+    for (int _ = 0; _ < e; _++) {
+        int x, y;
+        cin >> x >> y;
+        graph.add_edge(x - 1, y - 1);
+    }
+
+    memset(ans_cache, -1, sizeof(ans_cache));
+
+    for (int vertex = 0; vertex < v; vertex++) {
+        cout << dfs(graph, vertex) + 1 << " ";
+    }
+    cout << endl;
+
+    return 0;
+}
diff --git a/luogu_P1160_biodir_linked_list.cpp b/luogu_P1160_biodir_linked_list.cpp
new file mode 100644
index 0000000..01a8877
--- /dev/null
+++ b/luogu_P1160_biodir_linked_list.cpp
@@ -0,0 +1,85 @@
+#include <cassert>
+#include <iostream>
+#include <vector>
+
+using namespace std;
+
+class LinkedList {
+public:
+    struct Node {
+        int previous = -1, next = -1;
+    };
+
+    vector<Node> nodes;
+
+    int get_adjacent(int idx, bool next) const {
+        if (next) { return nodes[idx].next; }
+        return nodes[idx].previous;
+    }
+
+    void add(int l, int r) {
+        if (l > -1) { nodes[l].next = nodes.size(); }
+        if (r > -1) { nodes[r].previous = nodes.size(); }
+        nodes.push_back({.previous = l, .next = r});
+    }
+
+    void remove(int idx) {
+        if (nodes[idx].previous > -1) {
+            nodes[nodes[idx].previous].next = nodes[idx].next;
+        }
+        if (nodes[idx].next > -1) {
+            nodes[nodes[idx].next].previous = nodes[idx].previous;
+        }
+        nodes[idx] = {-2, -2};
+    }
+
+    void print() {
+        int start_idx = -1;
+        for (int i = 0; i < nodes.size(); i++) {
+            if (nodes[i].previous == -1) {
+                start_idx = i;
+                break;
+            }
+        }
+        for (int i = start_idx; i != -1; i = nodes[i].next) {
+            cout << i + 1 << " ";
+        }
+        cout << endl;
+    }
+};
+
+LinkedList l;
+
+int main() {
+    ios::sync_with_stdio(false);
+    cin.tie(nullptr);
+
+
+    int n;
+    int to_be_operated;
+    bool is_next;
+
+    cin >> n;
+
+    l.add(-1, -1);
+
+    for (int _ = 0; _ < n - 1; _++) {
+        cin >> to_be_operated >> is_next;
+        to_be_operated--;
+        int adj = l.get_adjacent(to_be_operated, is_next);
+        if (is_next) {
+            l.add(to_be_operated, adj);
+        } else {
+            l.add(adj, to_be_operated);
+        }
+    }
+    cin >> n;
+    for (int _ = 0; _ < n; _++) {
+        cin >> to_be_operated;
+        l.remove(to_be_operated - 1);
+    }
+
+    l.print();
+
+    return 0;
+}