/*** 要点:in.size() + out.size() == MyQueue.size()
*/classMyQueue{Stack<Integer> in;Stack<Integer> out;/** Initialize your data structure here. */publicMyQueue(){in =newStack<>();out =newStack<>();}/** Push element x to the back of queue. */publicvoidpush(int x){in.push(x);}/** Removes the element from in front of queue and returns that element. */publicintpop(){// 出栈空,入栈导入if(out.isEmpty()){while(!in.isEmpty()){out.push(in.pop());}}return out.pop();}/** Get the front element. */publicintpeek(){if(out.isEmpty()){while(!in.isEmpty()){out.push(in.pop());}}return out.peek();}/** Returns whether the queue is empty. */publicbooleanempty(){return in.isEmpty()&& out.isEmpty();}}/*** Your MyQueue object will be instantiated and called as such:* MyQueue obj = new MyQueue();* obj.push(x);* int param_2 = obj.pop();* int param_3 = obj.peek();* boolean param_4 = obj.empty();*/
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