Light, More Light

ACCEPTED !! Simpler than i thought....
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Question: Light, More Light

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#include "iostream.h"
#include "math.h"

int main() {
       while(true) {
               unsigned int n;
               cin >> n;
               if(n == 0) break;
               int root = sqrt(n);
               if((root * root) == n) cout << "yes\n";
               else cout << "no\n";
       }
       return 0;
}

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