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为什么wa?#include<iostream>
using namespace std;
int a[105][505],n,d;
int main()
{
int i,j,flag;
while(scanf("%d%d",&n,&d)==2)
{
if(!n&&!d)
break;
if(n==0||d==0)
continue;
for(i=1;i<=d;i++)
for(j=1;j<=n;j++)
scanf("%d",&a[i][j]);
flag=0;
for(j=1;j<=n;j++)
{
int ans=0;
for(i=1;i<=d;i++)
{
if(a[i][j]==0)
break;
ans++;
}
if(ans==d)
{
flag=1;
break;
}
}
//printf("%s\n",(flag>0)?"yes":"no");
if(flag)
printf("yes\n");
else
printf("no\n");
}
return 0;
}
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