[프로그래머스] 부족한 금액 계산하기

문제 링크:

https://school.programmers.co.kr/learn/courses/30/lessons/82612

회고:

등차수열 합 공식 끝.

python

def solution(price: int, money: int, count: int):
    total_price = int((count * (count + 1) / 2) * price)

    if money >= total_price:
        return 0
    else:
        return total_price - money


if __name__ == "__main__":
    result = solution(3, 20, 4)

    print(result)
    print(result == 10)  # 정답

10
True