BOJ 15888 - 정답은 이수근이야!! [C++]

문제

링크

풀이

#include <iostream>
using namespace std;
 
void solve(void) {
  int a, b, c;
  cin >> a >> b >> c;
 
  if (b % a != 0 || c % a != 0 || b*b - 4*a*c <= 0) {
    cout << "둘다틀렸근";
    return;
  }
 
  for (int x1=2; x1<=256; x1*=2) {
    for (int x2=2; x2<=256; x2*=2) {
      if (x1 == x2) continue;
      if (a*x1*x1+b*x1+c == 0 && a*x2*x2+b*x2+c == 0) {
        cout << "이수근";
        return;
      }
    }
  }
 
  for (int x1=-200; x1<=200; x1++) {
    for (int x2=-200; x2<=200; x2++) {
      if (x1 == x2) continue;
      if (a*x1*x1+b*x1+c == 0 && a*x2*x2+b*x2+c == 0) {
        cout << "정수근";
        return;
      }
    }
  }
 
  cout << "둘다틀렸근";
}
 
int main(void) {
  ios::sync_with_stdio(false);
  cin.tie(nullptr);
 
  solve();
  return 0;
}