洛谷P1164

P1164 小A点菜

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#include<bits/stdc++.h>
using namespace std;

const int M = 10010, N = 1010;
int dp[M];

int main() {
    int m, n; cin >> n >> m;
    vector<int>a(n + 1);
    for(int i = 1; i <= n; i++) {
        cin >> a[i];
    }
    dp[0] = 1;
    for(int i = 1; i <= n; i++) {
        for(int j = m; j >= a[i]; j--) {
            dp[j] += dp[j - a[i]];
        }
    }
    cout << dp[m] << '\n';
    return 0;
}