记录编号	379179	评测结果	AAAAAAAAAA
题目名称	砍树	最终得分	100
用户昵称	TARDIS	是否通过	通过
代码语言	C++	运行时间	0.664 s
提交时间	2017-03-05 20:27:15	内存使用	7.94 MiB

#include<iostream>
#include<cstdio>
#include<cmath>
#include<algorithm>
#include<cstdlib>
using namespace std;
long long n,m,h,ans,mid;long long l,r=-1;
long long tall[1000001];
inline void readln(){
	freopen("eko.in","r",stdin);
	freopen("eko.out","w",stdout);
	cin>>n>>m;
	for (long long i=1;i<=n;i++){
		cin>>tall[i];
		r=max(r,tall[i]);
	}
}
inline bool check(int x){
	long long ans=0;
	for (long long i=1;i<=n;i++){
		if (tall[i]>x) ans+=tall[i]-x;
	}
	if (ans>=m) return 0;
	else return 1;
}
inline void work(){
	l=1;
	while (l<=r){
		mid=(l+r)>>1;
		long long ans=0;
	    for (long long i=1;i<=n;i++){
		if (tall[i]>mid) ans+=tall[i]-mid;
	}
	if (ans>=m)
		l=mid+1;
		else r=mid-1;
	}
	cout<<r;
}
int main(){
	ios::sync_with_stdio(false);
	readln();
	work();
	return 0;
}