[UVa] 10110 Light, more light.cpp

#include <cstdio>
#include <cmath>
using namespace std;
typedef unsigned int uint;
int main()
{
    uint n;
    while (scanf("%u",&n)){
        if (!n) break;
        uint a = sqrt(n);
        if (a * a == n) printf("yes\n");
        else printf("no\n");
    }
    return 0;
}