BOJ 17177 - 내접사각형 만들기 [C++]

문제

링크

풀이

#include <cmath>
#include <iostream>
using namespace std;
 
inline double calc(double a, double b, double c) {
  return (-b + sqrt(b * b - 4 * a * c)) / (2 * a);
}
 
int solve(void) {
  int a, b, c; cin >> a >> b >> c;
 
  double ans = calc(a, 2 * b * c, a * (b * b + c * c - a * a));
  return ans < 0 ? -1 : ans;
}
 
int main(void) {
  ios::sync_with_stdio(false);
  cin.tie(nullptr);
 
  cout << solve();
  return 0;
}