[Programmers] Lv1: 부족한 금액 계산하기(82612)

문제

- 링크: https://school.programmers.co.kr/learn/courses/30/lessons/82612?language=java

 

풀이

class Solution {
    public long solution(int price, int money, int count) {
        long answer = -1;
        long change = money;
        
        for (int i = 0; i < count; ++i) {
            change -= (long)price * (i + 1);            
        }
        
        if (change >= 0) {
            answer = 0;
        } else {
            answer = -change;
        }

        return answer;
    }
}