[leetcode] reverse string [344]

problem : Write a function , Its function is to invert the input string . Input string as character array s Given in the form of

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"]

Python3 Problem solving  

#  solution 1: Double pointer 
def reverseString(s):
    left, right = 0, len(s) - 1
    while left < right:
        s[left], s[right] = s[right], s[left]
        left = left + 1
        right = right - 1
    return s

#  solution 2
def reverseString(s):
    s.reverse()
    return s

# ['o', 'l', 'l', 'e', 'h']
reverseString(["h","e","l","l","o"])
# ['h', 'a', 'n', 'n', 'a', 'H']
reverseString(["H","a","n","n","a","h"])