feat: add python and java solutions to leetcode problem: No.0344

Author: yanglbme

solution/0300-0399/0344.Reverse String/README.md

@@ -35,15 +35,33 @@
 <!-- 这里可写当前语言的特殊实现逻辑 -->
 
 ```python
-
+class Solution:
+    def reverseString(self, s: List[str]) -> None:
+        """
+        Do not return anything, modify s in-place instead.
+        """
+        s[:] = s[::-1]
 ```
 
 ### **Java**
 
 <!-- 这里可写当前语言的特殊实现逻辑 -->
 
 ```java
-
+class Solution {
+    public void reverseString(char[] s) {
+        int n;
+        if (s == null || (n = s.length) < 2) return;
+        int i = 0, j = n - 1;
+        while (i < j) {
+            char t = s[i];
+            s[i] = s[j];
+            s[j] = t;
+            ++i;
+            --j;
+        }
+    }
+}
 ```
 
 ### **...**

solution/0300-0399/0344.Reverse String/README_EN.md

@@ -47,13 +47,31 @@
 ### **Python3**
 
 ```python
-
+class Solution:
+    def reverseString(self, s: List[str]) -> None:
+        """
+        Do not return anything, modify s in-place instead.
+        """
+        s[:] = s[::-1]
 ```
 
 ### **Java**
 
 ```java
-
+class Solution {
+    public void reverseString(char[] s) {
+        int n;
+        if (s == null || (n = s.length) < 2) return;
+        int i = 0, j = n - 1;
+        while (i < j) {
+            char t = s[i];
+            s[i] = s[j];
+            s[j] = t;
+            ++i;
+            --j;
+        }
+    }
+}
 ```
 
 ### **...**

solution/0300-0399/0344.Reverse String/Solution.java

@@ -1,19 +1,14 @@
 class Solution {
-    public String reverseString(String s) {
-        if (s == null || s.length() < 2) {
-            return s;
+    public void reverseString(char[] s) {
+        int n;
+        if (s == null || (n = s.length) < 2) return;
+        int i = 0, j = n - 1;
+        while (i < j) {
+            char t = s[i];
+            s[i] = s[j];
+            s[j] = t;
+            ++i;
+            --j;
         }
-        char[] chars = s.toCharArray();
-        int p = 0;
-        int q = chars.length - 1;
-        while (p < q) {
-            char tmp = chars[p];
-            chars[p] = chars[q];
-            chars[q] = tmp;
-            ++p;
-            --q;
-        }
-        return String.valueOf(chars);
     }
-
 }

solution/0300-0399/0344.Reverse String/Solution.py

@@ -1,15 +1,6 @@
 class Solution:
-    def reverseString(self, s):
+    def reverseString(self, s: List[str]) -> None:
         """
-        :type s: str
-        :rtype: str
+        Do not return anything, modify s in-place instead.
         """
-        length=len(s)
-        if length < 2:
-            return s
-        ns=''
-        p=length-1
-        while p >= 0:
-            ns += s[p]
-            p-=1
-        return ns
+        s[:] = s[::-1]