1712 - 손익분기점

#include <iostream>
using namespace std;

int main()
{
    int A, B, C;
    cin >> A >> B >> C;
    int cost;
    cost = C - B;               // 순수익
    if (cost <= 0) {
        cout << "-1" << endl;
    } else {
        cout << A / cost + 1;   // 순수익으로 고정비용 처리단계
    }

    return 0;
}

문제 :

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

풀이참고 :

https://yongku.tistory.com/entry/%EB%B0%B1%EC%A4%80-%EC%95%8C%EA%B3%A0%EB%A6%AC%EC%A6%98BOJ-%EB%B0%B1%EC%A4%80-1712%EB%B2%88-%EC%86%90%EC%9D%B5%EB%B6%84%EA%B8%B0%EC%A0%90-C