[Programmers] 부족한 금액 계산하기 (Java)

• Reference

Solution

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