Update CMakeLists.txt

dp/backpack_dp/NOIP2005J_herbs_dp_knapsack_PINGPONG.cpp

@@ -0,0 +1,54 @@
+#include <iostream>
+
+using namespace std;
+
+struct Item {
+    int weight, value;
+};
+
+constexpr int MAX_N = 105, MAX_CAPACITY = 1005;
+int capacity, n;
+Item items[MAX_N];
+int dp[2][MAX_CAPACITY];
+bool ping_pong;
+
+void log_dp() {
+    // for (int i = 0; i <= 1; i++) {
+        for (int j = 0; j <= capacity; j++) {
+            clog << dp[ping_pong][j] << "\t";
+        }
+        clog << endl;
+    // }
+}
+
+void solve_dp() {
+    // for (int i = 0; i <= capacity; i++) { dp[0][i] = 0; }
+    // for (int i = 0; i <= n; i++) { dp[i][0] = 0; }
+    for (int stop_item = 1; stop_item <= n; stop_item++, ping_pong = !ping_pong) {
+        for (int w = 1; w <= capacity; w++) {
+            dp[ping_pong][w] = dp[!ping_pong][w];
+            if (w >= items[stop_item - 1].weight) { // 负数
+                dp[ping_pong][w] =
+                    max(dp[ping_pong][w],
+                        dp[!ping_pong][w - items[stop_item - 1].weight] + items[stop_item - 1].value);
+            }
+        }
+        // log_dp();
+    }
+}
+
+int main() {
+    ios::sync_with_stdio(false);
+    cin.tie(nullptr);
+
+    cin >> capacity >> n;
+    for (int i = 0; i < n; i++) {
+        cin >> items[i].weight >> items[i].value;
+    }
+
+    solve_dp();
+    cout << dp[!ping_pong][capacity] << endl;
+
+
+    return 0;
+}