#include<bits/stdc++.h> using namespace std; int main() { int d, num; for(int i = 1; i <= 9; ++i) for(int j = 0; j <= 9; ++j) { num = i*1000+i*100+j*10+j; d = sqrt(num);//sqrt() if(num == d*d) cout << num << endl; } return 0; }