classMyQueue4{privateStack<Integer> stack;/** Initialize your data structure here. */publicMyQueue4(){ stack =newStack<Integer>(); }/** Push element x to the back of queue. */publicvoidpush(intx){ stack.add(0, x); }/** Removes the element from in front of queue and returns th...
importjava.util.Stack;classMyQueue{//初始化栈1和栈2privateStack<Integer> Stack_1;privateStack<Integer> Stack_2;/** Initialize your data structure here. */publicMyQueue(){ Stack_1 =newStack<>(); Stack_2 =newStack<>(); }//进入第一个栈/** Push element x to the back of queue. */...
代码(Java): classMyQueue{privateStack<Integer>in=newStack<>();privateStack<Integer>out=newStack<>();// Push element x to the back of queue.publicvoidpush(intx){in.push(x);}// Removes the element from in front of queue.publicvoidpop(){while(!in.empty()){out.push(in.pop());}ou...
empty() – Return whether the stack is empty. Notes: You must use only standard operations of a queue – which means only push to back, peek/pop from front, size, and is empty operations are valid. Depending on your language, queue may not be supported natively. You may simulate a que...
Depending on your language, stack may not be supported natively. You may simulate a stack by using a list or deque (double-ended queue), as long as you use only standard operations of a stack. You may assume that all operations are valid (for example, no pop or peek operations will be...
class MyQueue: def __init__(self): self.stack_in = [] self.stack_out = [] def push(self, x: int) -> None: self.stack_in.append(x) def pop(self) -> int: if self.empty(): return None if self.stack_out: return self.stack_out.pop() ...
* int param_2 = myQueuePop(obj); * int param_3 = myQueuePeek(obj); * bool param_4 = myQueueEmpty(obj); * myQueueFree(obj); */ Java程序 Implement the following operations of a queue using stacks. push(x) -- Push element x to the back of queue. ...
思路:Queue是先进先出FIFO,Stack是先进后出FILO。使用Stack模拟实现Queue的功能,可以使用两个Stack,一个进行入Stack操作,一个进行出Stack操作。这两个Stack中的元素位置是颠倒的。比如,一个元素在第一个Stack位于Stack头,那么这个元素在另一个Stack则位于Stack尾。
importjava.util.LinkedList;importjava.util.Queue;classMyStack{privateQueue<Integer>queue_1=newLinkedList<>();privateQueue<Integer>queue_2=newLinkedList<>();privateint top;/** Initialize your data structure here. */publicMyStack(){}/** Push element x onto stack. */publicvoidpush(int x){queu...
Dequeue an element from the queue. C++ Java Python #include<bits/stdc++.h> using namespace std; class Stack { queue<int>q; public: void push(int val); void pop(); int top(); bool empty(); }; void Stack::push(int val) { int s = q.size(); q.push(val); for (int i=0...