쉬운 문제로 자신감 올리기..
class Solution:
def reverseString(self, s: List[str]) -> None:
"""
Do not return anything, modify s in-place instead.
"""
length = (int)(len(s) / 2)
for i in range(length):
k = len(s) - 1 - i
temp = s[i]
s[i] = s[k]
s[k] = temp