题目链接:点击这里
#include<iostream>
#include<cstdio>
#include<cstring>
#include<algorithm>
using namespace std;
typedef long long ll;
const int N = 3010;
ll f[N];
int main()
{
int n, m;
scanf("%d%d", &n, &m);
f[0] = 1;
for(int i = 1; i <= n; ++i)
{
int a;
scanf("%d", &a);
for(int j = a; j <= m; ++j)
f[j] += f[j - a];
}
printf("%lld\n", f[m]);
return 0;
}