Concise Java AC code


  • 2
    M
    class MyQueue {
        Stack<Integer> stack1 = new Stack<Integer>();
        Stack<Integer> stack2 = new Stack<Integer>();
        // Push element x to the back of queue.
        public void push(int x) {
            while(!stack1.isEmpty()){
                stack2.push(stack1.pop());
            }
            stack1.push(x);
            while(!stack2.isEmpty()){
                stack1.push(stack2.pop());
            }
        }
    
        // Removes the element from in front of queue.
        public void pop() {
            stack1.pop();
        }
    
        // Get the front element.
        public int peek() {
            return stack1.peek();
        }
    
        // Return whether the queue is empty.
        public boolean empty() {
            return stack1.isEmpty();
        }
    }

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