POJ 2864

 1 #include <iostream>
 2 #define MAXN 600
 3 using namespace std;
 4
 5 int _m[MAXN][MAXN];
 6
 7 int main()
 8 {
 9     //freopen("acm.acm","r",stdin);
10     int c;
11     int r;
12     int i;
13     int j;
14     int sum;
15
16     while(cin>>c>>r,c||r)
17     {
18
19     for(i = 0; i < r; ++ i)
20     {
21         for(j = 0; j < c; ++ j)
22         {
23             cin>>_m[i][j];
24         }
25     }
26
27     for(j = 0; j < c; ++ j)
28     {
29         sum = 0;
30         for(i = 0; i < r; ++ i)
31         {
32             //sum += _m[i][j];
33             if(_m[i][j] == 0)
34             {
35                 break;
36             }
37         }
38         if(i == r)
39         {
40             cout<<"yes"<<endl;
41             break;
42         }
43     }
44     if(j == c)
45     {
46         cout<<"no"<<endl;
47     }
48     }
49
50 }