Update 344._reverse_string.md

Author: 0xkookoo

docs/Leetcode_Solutions/Python/344._reverse_string.md

@@ -1,18 +1,36 @@
-### 344. Reverse String
+# 344. Reverse String
 
+**<font color=red>难度: Easy</font>**
 
+## 刷题内容
 
-题目:
-<https://leetcode.com/problems/reverse-string/>
+> 原题连接
 
+* https://leetcode.com/problems/reverse-string/
 
-难度:
-Easy
+> 内容描述
 
-思路：
+```
+Write a function that takes a string as input and returns the string reversed.
 
-不要脸的python AC code:
+Example 1:
 
+Input: "hello"
+Output: "olleh"
+Example 2:
+
+Input: "A man, a plan, a canal: Panama"
+Output: "amanaP :lanac a ,nalp a ,nam A"
+```
+
+## 解题方案
+
+> 思路 1
+******- 时间复杂度: O(N)******- 空间复杂度: O(N)******
+
+因为python不支持item assignment
+
+所以如果非要用two pointer来做的话，那么会是这样
 
 ```python
 class Solution(object):
@@ -21,12 +39,23 @@ class Solution(object):
         :type s: str
         :rtype: str
         """
-        return s[::-1]
+        lst = list(s)
+        start, end = 0, len(lst) - 1
+
+        while start < end:
+            lst[end], lst[start] = lst[start], lst[end]
+            start += 1
+            end -= 1
+        return ''.join(lst)
 ```
 
-因为python不支持item assignment
 
-所以如果非要用two pointer来做的话，那么会是这样
+
+> 思路 2
+******- 时间复杂度: O(N)******- 空间复杂度: O(1)******
+
+不要脸的python AC code:
+
 
 ```python
 class Solution(object):
@@ -35,13 +64,5 @@ class Solution(object):
         :type s: str
         :rtype: str
         """
-        lst = list(s)
-        n = len(lst)
-        start, end = 0, n - 1
-
-        while start < end:
-        	lst[end], lst[start]  = lst[start],lst[end]
-        	start += 1
-        	end -= 1
-        return ''.join(lst)
+        return s[::-1]
 ```