https://school.programmers.co.kr/learn/courses/30/lessons/82612
위클리 챌린지
def solution(price, money, count):
total_price = 0
for i in range(count):
total_price += price*(i+1)
if total_price > money:
return total_price - money
else:
return 0
def solution(price, money, count):
return max(0,price*(count+1)*count//2-money)
등차수열의 합이라나 뭐라나..