二分查找 WA 9个点 求助qwq

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

#define RE register
#define ll long long

ll n,m,imax=-233333333333;
ll f[1000100];

inline void fread(ll &x){
    x=0;
    ll f=1;
    char ch=getchar();
    while(ch<'0'||ch>'9'){
        if(ch=='-')f=-1;
        ch=getchar();
    }
    while(ch>='0'&&ch<='9'){
        x=(x<<1)+(x<<3)+(ch^48);
        ch=getchar();
    }
    x*=f;
}

inline ll work(ll x){
    //cout<<x<<endl;
    ll ans=0;
    for(RE ll i=1;i<=n;i++){
        if(f[i]>x){
            ans+=f[i]-x;
        }
    }
    return ans;
}

int main(){
    fread(n);
    fread(m);
    for(RE ll i=1;i<=n;i++){
        fread(f[i]);
        imax=max(f[i],imax);
    }
    ll l=0,r=imax;
    while(l<=r){
        ll mid=(l+r)/2;
        ll t=work(mid);
        if(t>m){
            l=mid+1;
        }else{
            r=mid-1;
        }
    }
    cout<<l;
    return 0;
}