344 Reverse string

Original Description: Write a function that takes a string as input and returns the string reversed.

  • 要求: 将一个给定string reverse

  • 返回: reverse后的string

  • 例子:
    • input: ‘hello’
    • output: ‘olleh’


以string的中间位置为pivot,将其左右两边character进行交换。 Note: 中间位置 = \(len(s)//2\)

class Solution(object):
    def reverseString(self, s):
        :type s: str
        :rtype: str
        l = [ss for ss in s]
        for i in range(len(l)//2):
            tmp = l[i]
            l[i] = l[-(i+1)]
            l[-(i+1)] = tmp
        return "".join(l)