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history_source/挑战程序设计竞赛/2.3.3.2.cpp

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+#include<cstdio>
+int n,m,M;
+int a[1001],dp[1001][1001];
+void solve()
+{
+	int i,j;
+	for(i=0;i<=n;i++) dp[i][0]=1;
+	for(i=0;i<n;i++)
+		for(j=1;j<=m;j++)
+			if(j-1-a[i]>=0)
+				dp[i+1][j]=(dp[i+1][j-1]+dp[i][j]-dp[i][j-1-a[i]]+M)%M;
+			else
+				dp[i+1][j]=(dp[i+1][j-1]+dp[i][j])%M;
+	printf("%d\n",dp[n][m]);
+}
+void init()
+{
+	scanf("%d%d",&n,&m);
+	for(int i=0;i<n;i++) scanf("%d",a+i);
+	scanf("%d",&M);
+}
+int main()
+{
+	init();
+	solve();
+	return 0;
+}