https://programmers.co.kr/learn/courses/30/lessons/77884\
def solution(left, right):
answer = 0
for i in range(left, right+1):
cnt=0
for j in range(1, i+1):
if i%j==0:
cnt+=1
if cnt%2==0:
answer+=i
else:
answer-=i
return answer
def solution(left, right):
answer = 0
for i in range(left,right+1):
if int(i**0.5)==i**0.5:
answer -= i
else:
answer += i
return answer