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hdu 1337 The Drunk Jailer

http://acm.hdu.edu.cn/showproblem.php?pid=1337

 1 #include <cstdio> 2 #include <cstring> 3 #define maxn 200 4 using namespace std; 5 int main() 6 { 7     int t; 8     int a[maxn]; 9     scanf("%d",&t);10     int n;11     while(t--)12     {13         scanf("%d",&n);14         for(int i=1; i<=maxn; i++) a[i]=1;15         for(int i=1; i<=n; i++)16         {17             for(int j=i; j<=n; j+=i)18             {19                 a[j]^=1;20             }21         }22         int ans=0;23         for(int i=1; i<=n; i++)24         {25             if(!a[i]) ans++;26         }27         printf("%d\n",ans);28     }29     return 0;30 }
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