Codeforces Mafia

题目链接：http://codeforces.com/problemset/problem/348/A

代码：

#include<cstdio>
#include<cstring>
#include<iostream>
#include<algorithm>
using namespace std;

int main()
{
    //freopen("E:\acm\input.txt","r",stdin);
    int n;
    scanf("%d",&n);

    long long L,R;
    L = R = 0;
    for(int i=1; i<=n; i++)
    {
        long long a;
        scanf("%I64d",&a);
        R += a;
        L = max(L,a);
    }
    long long sum = R;
    while(L < R)
    {
        long long mid = (L + R)/2;
        if( mid*(n-1) < sum)  L = mid + 1;
        else                 R = mid;
    }
    printf("%I64d
",L);
}