[Level 1] / [Python] 약수의 개수와 덧셈

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

프로그래머스

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def common_division(num):
    cd_list = []
    for i in range(1, num//2 + 1):
        if num % i == 0:
            cd_list.append(i)
            cd_list.append(int(num/i))
    return len(sorted(set(cd_list)))

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