> #include<iostream>
> #include<stdlib.h>
> #include<string.h>
> 
> using namespace std;
> 
> int b[100];
> 
> int main()
> {
>     int N,D,i,j,re,count;
>     while(cin>>N>>D)
>     {
>         if(N==D&&D==0) break;
>         memset(b,0,N*4);
>         count=N;
>         for(i=0;i<D;i++)
>         {
>             for(j=0;j<N;j++)
>             {
>                 cin>>re;
>                 if(re==1)
>                    b[j]++;
>                 if(b[j]<(i+1)){ 
>                    count--;
>                    b[j]=D;
>                 }    
>             }
>             if(count==0) break;
>         }   
>         if(count==0)
>          cout<<"no"<<endl;
>         else        
>          cout<<"yes"<<endl; 
>     }    
>     system("pause");
>     return 0;
> }