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高手帮忙指点一下哈!真不知错哪里了

Posted by VCSun at 2007-07-25 02:50:23 on Problem 2864
#include <stdio.h>
main()
{
	int a[200][100];
	int N;
	int D;
	int i,j;
	int flag;
	while(scanf("%d %d",&N,&D)!=EOF&&N!=0&&D!=0)
	{
		for(i=0;i<50;i++)
		for(j=0;j<10;j++)
		a[i][j]=1;
		for(i=1;i<=D;i++)
			for(j=1;j<=N;j++)
			scanf("%d",&a[i][j]);

		for(i=1;i<=N;i++)
		{
			flag=1;
			for(j=1;j<=D;j++)
		{
			flag=a[j][i]*a[j-1][i];
			if(flag==0)break;
			else if(j==D&&flag==1)goto L;
		}
		}
		L:
		if(flag)printf("yes\n");
		else printf("no\n");
	}
}

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