ACM Q10110

#include <iostream>
#include <math.h>
using namespace std;
int main(void){
        unsigned int N;
        while(true){
                cin>>N;
                if(N==0)
                        break;
                if((int)(sqrt(N))*(int)(sqrt(N))==N)
                        cout<<"yes"<<endl;
                else
                        cout<<"no"<<endl;
        }
        return 0;
}

下面是錯誤的code:

#include <iostream>
#include <math.h>
using namespace std;
int main(void){
        long long int N;
        while(true){
                cin>>N;
                if(N==0)
                        break;
                if((int)(sqrt(N))*(int)(sqrt(N))==N)
                        cout<<"yes"<<endl;
                else
                        cout<<"no"<<endl;
        }
        return 0;
}