💡 Python 3
약수의 개수와 덧셈 [Link]
def solution(left, right):
result = 0
for num in range(left, right+1):
count = 1
for i in range(1, num):
if num % i == 0: count += 1
if count % 2 == 0: result += num
else: result -= num
return result