本文主要是介绍232.栈实现队列,希望对大家解决编程问题提供一定的参考价值,需要的开发者们随着小编来一起学习吧!
请你仅使用两个栈实现先入先出队列。队列应当支持一般队列支持的所有操作(push
、pop
、peek
、empty
):
实现 MyQueue
类:
void push(int x)
将元素 x 推到队列的末尾int pop()
从队列的开头移除并返回元素int peek()
返回队列开头的元素boolean empty()
如果队列为空,返回true
;否则,返回false
class MyQueue{Deque<Integer> inStack;Deque<Integer> outStack;public MyQueue(){inStack = new ArrayDeque<Integer>();outStack = new ArrayDeque<Integer>();}public void push(int x){inStack.push(x);}public int pop(){if(outStack.isEmpty()){in2out();}return outStack.pop();}public int peek(){if(outStack.isEmpty()){in2out();}return outStack.peek();}public boolean empty(){return inStack.isEmpty() && outStack.isEmpty();}private void in2out(){while(!inStack.isEmpty()){outStack.push(inStack.pop());}}}
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