CF19B Checkout Assistant

R73187794

Luogu/CF19B/CF19B.cpp

@@ -0,0 +1,39 @@
+#include <cstring>
+#include <iostream>
+
+using std::cin;
+using std::cout;
+const char endl = '\n';
+
+const int N = 2005;
+
+int n, t[N], c[N];
+long long f[N << 1], ans;
+
+int main() {
+    std::ios::sync_with_stdio(false);
+
+    cin >> n;
+    for (int i = 1; i <= n; i++) {
+        cin >> t[i] >> c[i];
+        t[i] = std::min(n, t[i] + 1);
+    }
+
+    ans = 0x3f3f3f3f3f3f3f3f;
+    memset(f, 0x3f, sizeof(f));
+    f[0] = 0;
+
+    for (int i = 1; i <= n; i++) {
+        for (int j = n << 1; j >= t[i]; j--) {
+            f[j] = std::min(f[j], f[j - t[i]] + c[i]);
+        }
+    }
+
+    for (int i = 0; i <= n; i++) {
+        ans = std::min(ans, f[n + i]);
+    }
+
+    cout << ans << endl;
+
+    return 0;
+}