BZOJ 1816 扑克牌

#include<iostream>
#include<cstdio>
#include<cstring>
#include<algorithm>
#define maxn 55
using namespace std;
int n,m,c[maxn],l=0,r=0,ans;
bool check(int x)
{
    int ret=min(m,x);
    for (int i=1;i<=n;i++)
    {
        if (c[i]<x) ret-=(x-c[i]);
        if (ret<0) return false;
    }
    if (ret>=0) return true;
    return false;
}
int main()
{
    scanf("%d%d",&n,&m);
    for (int i=1;i<=n;i++)
        scanf("%d",&c[i]);
    l=1;r=1000000000;
    while (l<=r)
    {
        int mid=l+r>>1;
        if (check(mid)) {ans=mid;l=mid+1;}
        else r=mid-1;
    }
    printf("%d\n",ans);
    return 0;
}