Doubles

http://poj.org/problem?id=1552

 1 #include<stdio.h>
 2 const int N=102;
 3 int main()
 4 {
 5     int n,f[N],g[N];
 6     int cnt;
 7     while(1)
 8     {
 9         cnt = 0;
10         scanf("%d",&n);
11         if (n==-1)
12             break;
13         f[0] = n;
14         g[0] = 2*n;
15         int i ;
16         for ( i = 1;; i ++)
17         {
18             scanf("%d",&f[i]);
19             if (f[i]==0)
20                 break;
21             g[i] = 2*f[i];
22         }
23         for (int j = 0; j < i; j ++)
24         {
25             for (int k = 0; k < i; k ++)
26             {
27                 if (f[j]==g[k])
28                     cnt++;
29             }
30         }
31         printf("%d\n",cnt);
32     }
33     return 0;
34 }
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posted @ 2013-08-02 11:13  N_ll  阅读(148)  评论(0)  编辑  收藏  举报