1470. 【2022.7.11】饥饿的小鸟（river）

https://sjzezoj.com/submission/53621

S2OJ/1470/1470.cpp

@@ -0,0 +1,45 @@
+#include <iostream>
+#include <cstring>
+#include <limits>
+#include <queue>
+
+using std::cin;
+using std::cout;
+const char endl = '\n';
+
+const int N = 1e5 + 5;
+
+int n, l, s, a[N], b[N];
+
+int main() {
+    std::ios::sync_with_stdio(false);
+    cin.tie(nullptr);
+
+    cin >> n >> l;
+
+    for (int i = 1; i < n; i++) {
+        cin >> a[i];
+
+        s += a[i];
+    }
+
+    a[n] = b[0] = s;
+    for (int i = 0; i < n; i++) {
+        for (int j = std::min(i + l, n); j > i; j--) {
+            if (b[j] < a[j]) {
+                if (b[j] + b[i] <= a[j]) {
+                    b[j] += b[i];
+                    b[i] = 0;
+                    break;
+                } else {
+                    b[i] -= a[j] - b[j];
+                    b[j] = a[j];
+                }
+            }
+        }
+    }
+
+    cout << b[n] << endl;
+
+    return 0;
+}