joj 2651

水题，我竟然把Yes和No写成了YES和NO。。。。。

#include<iostream>
#include<stdio.h>
using namespace std;
int frid[105][105];
int cloth[105];
int n;
int r_right;
void dfs(int m,int c)
{
     //cout<<m<<endl;
    if(r_right==0)
       return;
    int j;
    for(j=0;j<n;j++)
    {
        if(frid[m][j])
        {
            if(cloth[j]==-1)
            {
                cloth[j]=1-cloth[m];
                dfs(j,cloth[j]);
            }
            else
            {
                if(cloth[j]!=1-cloth[m])
                {
                  r_right=0;
                  return;
                }
            }
        }
    }
}
int main()
{
    while(scanf("%d",&n),n)
    {
        int i,j;
        r_right=1;
        memset(cloth,-1,sizeof(cloth));
        for(i=0;i<n;i++)
           for(j=0;j<n;j++)
              scanf("%d",&frid[i][j]);
        for(i=0;i<n&&r_right;i++)
        {
            if(cloth[i]==-1)
            {
                 cloth[i]=0;
                 dfs(i,0);
            }
        }
        if(r_right)
             printf("Yes\n");
        else
             printf("No\n");
    }
}