feat: 0941.有效的山脉数组,新增rust解法

problems/0941.有效的山脉数组.md

@@ -196,7 +196,22 @@ public class Solution {
 }
 ```
 
-
+### Rust
+```rust
+impl Solution {
+    pub fn valid_mountain_array(arr: Vec<i32>) -> bool {
+        let mut i = 0;
+        let mut j = arr.len() - 1;
+        while i < arr.len() - 1 && arr[i] < arr[i + 1] {
+            i += 1;
+        }
+        while j > 0 && arr[j] < arr[j - 1] {
+            j -= 1;
+        }
+        i > 0 && j < arr.len() - 1 && i == j
+    }
+}
+```
 
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