C++ 알고리즘 - 백준 1712 손익분기점

https://www.acmicpc.net/problem/1712

 

#include <iostream>

#define endl "\n"

using namespace std;

int main(void) {
	// C++ Init
	ios::sync_with_stdio(false);
	cin.tie(NULL);

	int in1, in2, in3;
	int cnt = 1;
	cin >> in1 >> in2 >> in3;

	int i = 1;
	while (true) {
		if (in3 < in2 || in3 == in2) {
			cout << "-1"; exit(0);
		}

		else {
			int answer = in1 / (in3 - in2);
			cout << ++answer;
			return 0;
		}
	}
}