feat: add solutions to lc problem: No.0151. Reverse Words in a String

Author: yanglbme

solution/0100-0199/0151.Reverse Words in a String/README.md

@@ -83,15 +83,34 @@
 <!-- 这里可写当前语言的特殊实现逻辑 -->
 
 ```python
-
+class Solution:
+    def reverseWords(self, s: str) -> str:
+        words = s.strip().split()
+        return ' '.join(words[::-1])
 ```
 
 ### **Java**
 
 <!-- 这里可写当前语言的特殊实现逻辑 -->
 
 ```java
+class Solution {
+    public String reverseWords(String s) {
+        List<String> words = Arrays.asList(s.trim().split("\\s+"));
+        Collections.reverse(words);
+        return String.join(" ", words);
+    }
+}
+```
+
+### **C#**
 
+```cs
+public class Solution {
+    public string ReverseWords(string s) {
+         return string.Join(" ", s.Trim().Split(" ").Where(word => !string.IsNullOrEmpty(word) && !string.IsNullOrEmpty(word.Trim())).Reverse());
+    }
+}
 ```
 
 ### **...**

solution/0100-0199/0151.Reverse Words in a String/README_EN.md

@@ -70,13 +70,32 @@
 ### **Python3**
 
 ```python
-
+class Solution:
+    def reverseWords(self, s: str) -> str:
+        words = s.strip().split()
+        return ' '.join(words[::-1])
 ```
 
 ### **Java**
 
 ```java
+class Solution {
+    public String reverseWords(String s) {
+        List<String> words = Arrays.asList(s.trim().split("\\s+"));
+        Collections.reverse(words);
+        return String.join(" ", words);
+    }
+}
+```
+
+### **C#**
 
+```cs
+public class Solution {
+    public string ReverseWords(string s) {
+         return string.Join(" ", s.Trim().Split(" ").Where(word => !string.IsNullOrEmpty(word) && !string.IsNullOrEmpty(word.Trim())).Reverse());
+    }
+}
 ```
 
 ### **...**

solution/0100-0199/0151.Reverse Words in a String/Solution.cs

@@ -1,41 +1,5 @@
-using System.Text;
-using System.Collections.Generic;
-using System.Linq;
-
 public class Solution {
     public string ReverseWords(string s) {
-        var sb = new StringBuilder();
-        var wordList = new List<string>();
-        foreach (var ch in s)
-        {
-            if (char.IsWhiteSpace(ch))
-            {
-                if (sb.Length > 0)
-                {
-                    wordList.Add(sb.ToString());
-                    sb.Clear();
-                }
-            }
-            else
-            {
-                sb.Append(ch);
-            }
-        }
-        if (sb.Length > 0)
-        {
-            wordList.Add(sb.ToString());
-            sb.Clear();
-        }
-        
-        foreach (var word in ((IEnumerable<string>)wordList).Reverse())
-        {
-            if (sb.Length > 0)
-            {
-                sb.Append(' ');
-            }
-            sb.Append(word);
-        }
-
-        return sb.ToString();
+         return string.Join(" ", s.Trim().Split(" ").Where(word => !string.IsNullOrEmpty(word) && !string.IsNullOrEmpty(word.Trim())).Reverse());
     }
 }

solution/0100-0199/0151.Reverse Words in a String/Solution.java

@@ -1,19 +1,7 @@
 class Solution {
     public String reverseWords(String s) {
-        int length = s.length();
-        if(length ==0)return s;
-        char[] res=new char[length];
-        int len=helper(s.toCharArray(), length -1,res,0,0);
-        return new String(res,0,len);
-    }
-    private int helper(char[] ch,int r,char[] res,int l,int len){
-        while(r>=0&&ch[r]==' ') r--;
-        if(r<0)return Math.max(0,len-1);
-        int rigth=r;
-        while(r>=0&&ch[r]!=' ') r--;
-        len+=rigth-r+1;
-        for(int left=r+1;left<=rigth;left++,l++) res[l] = ch[left];
-        if(l<res.length) res[l++] = ' ';
-        return helper(ch,r,res,l,len);
+        List<String> words = Arrays.asList(s.trim().split("\\s+"));
+        Collections.reverse(words);
+        return String.join(" ", words);
     }
 }

solution/0100-0199/0151.Reverse Words in a String/Solution.py

@@ -0,0 +1,4 @@
+class Solution:
+    def reverseWords(self, s: str) -> str:
+        words = s.strip().split()
+        return ' '.join(words[::-1])