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  1. #include <bits/stdc++.h>
  2. using namespace std;
  3.  
  4. int main() {
  5. long long n=1e18;
  6. cout<<sqrtl(n);
  7. return 0;
  8. }
Success #stdin #stdout 0.01s 5516KB
stdin
Standard input is empty
stdout
1e+09