feat: add solutions to lc problem: No.2255 (#4291)

No.2255.Count Prefixes of a Given String

Author: yanglbme

solution/2200-2299/2255.Count Prefixes of a Given String/README.md

@@ -62,11 +62,11 @@ words 中是 s = "abc" 前缀的字符串为：
 
 ### 方法一：遍历计数
 
-我们直接遍历数组 $words$，对于每个字符串 $w$，判断 $s$ 是否以 $w$ 为前缀，如果是则答案加一。
+我们直接遍历数组 $\textit{words}$，对于每个字符串 $w$，判断 $s$ 是否以 $w$ 为前缀，如果是则答案加一。
 
 遍历结束后，返回答案即可。
 
-时间复杂度 $O(m \times n)$，其中 $m$ 和 $n$ 分别是数组 $words$ 的长度和字符串 $s$ 的长度。空间复杂度 $O(1)$。
+时间复杂度 $O(m \times n)$，其中 $m$ 和 $n$ 分别是数组 $\textit{words}$ 的长度和字符串 $s$ 的长度。空间复杂度 $O(1)$。
 
 <!-- tabs:start -->
 
@@ -130,6 +130,26 @@ function countPrefixes(words: string[], s: string): number {
 }
 ```
 
+#### Rust
+
+```rust
+impl Solution {
+    pub fn count_prefixes(words: Vec<String>, s: String) -> i32 {
+        words.iter().filter(|w| s.starts_with(w.as_str())).count() as i32
+    }
+}
+```
+
+#### C#
+
+```cs
+public class Solution {
+    public int CountPrefixes(string[] words, string s) {
+        return words.Count(w => s.StartsWith(w));
+    }
+}
+```
+
 <!-- tabs:end -->
 
 <!-- solution:end -->

solution/2200-2299/2255.Count Prefixes of a Given String/README_EN.md

@@ -42,7 +42,7 @@ Thus the number of strings in words which are a prefix of s is 3.</pre>
 <strong>Input:</strong> words = [&quot;a&quot;,&quot;a&quot;], s = &quot;aa&quot;
 <strong>Output:</strong> 2
 <strong>Explanation:
-</strong>Both of the strings are a prefix of s. 
+</strong>Both of the strings are a prefix of s.
 Note that the same string can occur multiple times in words, and it should be counted each time.</pre>
 
 <p>&nbsp;</p>
@@ -130,6 +130,26 @@ function countPrefixes(words: string[], s: string): number {
 }
 ```
 
+#### Rust
+
+```rust
+impl Solution {
+    pub fn count_prefixes(words: Vec<String>, s: String) -> i32 {
+        words.iter().filter(|w| s.starts_with(w.as_str())).count() as i32
+    }
+}
+```
+
+#### C#
+
+```cs
+public class Solution {
+    public int CountPrefixes(string[] words, string s) {
+        return words.Count(w => s.StartsWith(w));
+    }
+}
+```
+
 <!-- tabs:end -->
 
 <!-- solution:end -->

solution/2200-2299/2255.Count Prefixes of a Given String/Solution.cs

@@ -0,0 +1,5 @@
+public class Solution {
+    public int CountPrefixes(string[] words, string s) {
+        return words.Count(w => s.StartsWith(w));
+    }
+}

solution/2200-2299/2255.Count Prefixes of a Given String/Solution.rs

@@ -0,0 +1,5 @@
+impl Solution {
+    pub fn count_prefixes(words: Vec<String>, s: String) -> i32 {
+        words.iter().filter(|w| s.starts_with(w.as_str())).count() as i32
+    }
+}