update 0232.用栈实现队列.md about rust

problems/0232.用栈实现队列.md

@@ -622,6 +622,48 @@ class MyQueue() {
 }
 ```
 
+rust:
+
+```rust
+struct MyQueue {
+    stack_in: Vec<i32>,
+    stack_out: Vec<i32>,
+}
+impl MyQueue {
+
+    fn new() -> Self {
+        MyQueue {
+            stack_in: Vec::new(),
+            stack_out: Vec::new(),
+        }
+        
+    }
+    
+    fn push(&mut self, x: i32) {
+        self.stack_in.push(x);
+    }
+    
+    fn pop(&mut self) -> i32 {
+        if self.stack_out.is_empty(){
+            while !self.stack_in.is_empty() {
+                self.stack_out.push(self.stack_in.pop().unwrap());
+            }
+        }
+        self.stack_out.pop().unwrap()
+    }
+    
+    fn peek(&mut self) -> i32 {
+        let res = self.pop();
+        self.stack_out.push(res);
+        res
+    }
+    
+    fn empty(&self) -> bool {
+       self.stack_in.is_empty() && self.stack_out.is_empty()
+    }
+}
+```
+
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