Merge pull request #2039 from Lozakaka/patch-1

Update 0225.用队列实现栈.md

problems/0225.用队列实现栈.md

@@ -365,6 +365,43 @@ class MyStack {
     }
 }
 
+```
+优化，使用一个 Queue 实现，但用卡哥的逻辑实现
+```
+class MyStack {
+    Queue<Integer> queue;
+    
+    public MyStack() {
+        queue = new LinkedList<>();
+    }
+    
+    public void push(int x) {
+        queue.add(x);
+    }
+    
+    public int pop() {
+        rePosition();
+        return queue.poll();
+    }
+    
+    public int top() {
+        rePosition();
+        int result = queue.poll();
+        queue.add(result);
+        return result;
+    }
+    
+    public boolean empty() {
+        return queue.isEmpty();
+    }
+
+    public void rePosition(){
+        int size = queue.size();
+        size--;
+        while(size-->0)
+            queue.add(queue.poll());
+    }
+}
 ```
 
 Python：