soj2012.King（有向图+蛋疼得一逼）

Description

There are n children in a country marked by integers from 1 to n.

They often fight with each other. For each pair of child A and child B, either A beats B or B beats A. It is not possible that both A beats B and B beats A. Of course, one never fight with himself.

Child A is not afraid of child B if A can beat B.

Child A is not afraid of child B if A can beat C and C can beat B either. Because A can say "I will call C to beat you" to B.

A child is called a king of children if he is not afraid of any other child.

Give you the beating relations.Find a king.

Input

The first line contains a integer n which is between 1 and 1000. The following n lines contains n characters respectively. Character is either '0' or '1'. The Bth character of (A+1)th line will be '1' if and only if A can beat B. Input is terminated by EOF.

Output

A number representing a king of children on a line. If such a king does not exist, output -1. If there are multiple kings, any one is accepted.

Sample Input

 Copy sample input to clipboard

2
01
00

Sample Output

1

给跪了，这个题目，一开始就知道了找出最大度的点。但频频WA，蛋疼。然后用DFS，Warshall都试了。甚至出现TLE，结果排了一个小时错，发现是index没有初始化就一直WA，我真心给跪了。。。。这个我觉得真没什么意义。但处于规范，还是加下吧。。。。。。

代码如下：

#include <iostream>
#include <string>
using namespace std;
int main()
{
	int N;
	string King;
	int i,j;
	int out;
	while(cin >> N)
	{
		int max = 0;
		int index = 0;   //这里没有初始化就一直WA
		for(i = 0;i < N;i++)
		{
			cin >> King;
			out = 0;
			for(j = 0;j < N;j++)
			{
				if(King[j] == '1')
					out++;
			}
			if(max < out)
			{
				max = out;
				index = i;
			}
		}
		cout << index + 1 << endl;
	}
	return 0;
}