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  1. #include <bits/stdc++.h>
  2. using namespace std;
  3.  
  4. int main() {
  5. int n, k;
  6. cin>>n;
  7. k=sqrt(n);
  8. if (k*k==n)
  9. cout<<"YES";
  10. else
  11. cout<<"NO";
  12. return 0;
  13. }
Success #stdin #stdout 0.01s 5316KB
stdin
9
stdout
YES