Write a function that reverses a string. The input string is given as an array of characters s
.
Example 1:
Input: s = ["h","e","l","l","o"] Output: ["o","l","l","e","h"]
Example 2:
Input: s = ["H","a","n","n","a","h"] Output: ["h","a","n","n","a","H"]
class Solution:
def reverseString(self, s: List[str]) -> None:
"""
Do not return anything, modify s in-place instead.
"""
f=0
l=len(s)-1
while f<l:
s[f],s[l]=s[l],s[f]
f+=1
l-=1
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