爲什麽？

#include <bits/stdc++.h>
using namespace std;
int main() {
    int n,s,a[10010];
    cin >> n >> s;
    for(int i = 0;i < n;i++){
        cin >> a[i];
    }
    sort(a,a + n);
    int num = 0;
    int i = 0;
    while(num + a[i] <= s){
        cout << a[i] << " ";
        num += a[i];
        i++;
    }
    return 0;
}