This file contains ambiguous Unicode characters that may be confused with others in your current locale. If your use case is intentional and legitimate, you can safely ignore this warning. Use the Escape button to highlight these characters.
#include <bits/stdc++.h>
using namespace std;
const int N = 110;
int a[N];
int n, m;
//纯递归思路，最后一个测试点TLE
//x:第几个位置
//m:钱数上限
int dfs(int x, int m) {
int ans = 0;
if (m == 0) return 1;//钱花光，增加一种办法
if (x == n) return 0;//选择完n种，钱还没有花光，无效方法
//看下一个菜，如果钱还够
if (a[x + 1] <= m)
ans += dfs(x + 1, m - a[x + 1]); //选择当前位置的菜
ans += dfs(x + 1, m); //不选择当前位置的菜
return ans;
}
int main() {
cin >> n >> m;
for (int i = 1; i <= n; i++)cin >> a[i];
cout << dfs(0, m) << endl;
return 0;
