題目
編寫一個函數,其作用是将輸入的字元串反轉過來。輸入字元串以字元數組 char[] 的形式給出。
不要給另外的數組配置設定額外的空間,你必須原地修改輸入數組、使用 O(1) 的額外空間解決這一問題。
你可以假設數組中的所有字元都是 ASCII 碼表中的可列印字元。
示例 1:
輸入:["h","e","l","l","o"]
輸出:["o","l","l","e","h"]
示例 2:
輸入:["H","a","n","n","a","h"]
輸出:["h","a","n","n","a","H"]
解題思路
class Solution:
def reverseString(self, s: [str]) -> None:
"""
Do not return anything, modify s in-place instead.
"""
#交叉替換
# midNum = len(s)//2
# for i in range(midNum):
# s[i], s[len(s)-1-i] = s[len(s)-1-i], s[i]
#python内置函數
s.reverse()