BOJ 15610 - Abbey Courtyard [C++]

문제

링크

풀이

#include <iostream>
#include <iomanip>
#include <cmath>
using namespace std;
 
void solve(void) {
  long long a; cin >> a;
 
  cout << fixed << setprecision(8) << sqrt(a) * 4;
}
 
int main(void) {
  ios::sync_with_stdio(false);
  cin.tie(nullptr);
 
  solve();
  return 0;
}