请求大佬纠错，谢谢谢谢

#include<iostream>
#include<algorithm>
#define int long long
const int N = 2e10+10,M = 1e6+10;
using namespace std;
int n,m;
int a[M];

int check(int mid)
{
    int sum = 0;
    for(int i = 1;i<=n;i++)
        if(a[i]>=mid) sum += (a[i]-mid);
    return sum;
}

signed main()
{
    cin>>n>>m;
    int len = 0;
    for(int i = 1;i<=n;i++) {cin>>a[i]; len = max(len,a[i]);}

    int l = 1, r = len;
    while (l<=r)
    {
        int mid = (l+r) >> 1;
        int ans = check(mid);
        if(ans==m){cout<<mid<<endl;
            break;}
        else if(ans>m) l = mid-1;
        else r = mid + 1;
    }
    return 0;
}