60 求救！！必关

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

const int N = 100050;

int  n, m;
int a[N];

bool check(int l) 
{
    int cnt = 0;
    for (int i = 1; i <= n; i++) 
    {
        if (a[i] > l)
        {
            cnt += a[i] - l;
        }
    }
    return cnt >= m;
}

signed main() 
{
    ios::sync_with_stdio(false);
    cin.tie(0);
    cout.tie(0);
    
    cin >> n >> m;
    int L = 0;
    for (int i = 1; i <= n; i++) 
    {
        cin >> a[i];
        L = max(L, a[i]);


    }
    sort(a + 1, a + n + 1);
    int l = 1, r = L;
    
    while (l <= r) 
    {
        int mid = (l + r) / 2;
        if (check(mid)) 
        {
            l = mid + 1;
        } 
        else 
        {
            r = mid - 1;
        }
    }
    
    cout << r ;
    return 0;
}