https://programmers.co.kr/learn/courses/30/lessons/12906
def solution(arr):
answer = []
for i in range(len(arr)):
if i==0:
answer.append(arr[i])
elif arr[i]!=arr[i-1]:
answer.append(arr[i])
return answer
def no_continuous(s):
a = []
for i in s:
if a[-1:] == [i]: continue
a.append(i)
return a