프로그래머스 / 약수의 개수와 덧셈 / 파이썬

https://programmers.co.kr/learn/courses/30/lessons/77884

def cal(n):
    count = 0
    for i in range(1, n+1):
        if n % i == 0:
            count+=1
    return count

def solution(left, right):
    answer = 0
    for n in range(left, right+1):
        if cal(n) % 2 == 0:
            answer += n
        else:
            answer -= n
    return answer