P1077 [NOIP2012 普及组] 摆花

R72644809

Luogu/P1077/P1077.cpp

@@ -0,0 +1,37 @@
+#include <iostream>
+
+using std::cin;
+using std::cout;
+const char endl = '\n';
+
+const int N = 105,
+          mod = 1e6 + 7;
+
+int n, m, a[N], f[N][N];
+
+int main() {
+    std::ios::sync_with_stdio(false);
+
+    cin >> n >> m;
+    for (int i = 1; i <= n; i++) {
+        cin >> a[i];
+    }
+
+    for (int i = 0; i <= n; i++) {
+        f[i][0] = 1;
+    }
+
+    for (int i = 1; i <= n; i++) {
+        for (int j = 0; j <= a[i]; j++) {
+            for (int k = 0; k <= m - j; k++) {
+                if (j || k) {
+                    f[i][j + k] = (f[i][j + k] + f[i - 1][k]) % mod;
+                }
+            }
+        }
+    }
+
+    cout << f[n][m] % mod << endl;
+
+    return 0;
+}