importjava.util.NoSuchElementException;importjava.util.LinkedList;importjava.util.Queue;classMyStack{/** * The main queue using to store all the elements in the stack */privateQueue<Integer> q1;/** * The auxiliary queue using to implement `pop` operation */privateQueue<Integer> q2;/** * ...
}/**Push element x onto stack.*/publicvoidpush(intx) {if(num == 1){ queue1.add(x); }else{ queue2.add(x); } }/**Removes the element on top of the stack and returns that element.*/publicintpop() {if(num == 1){intsize =queue1.size();for(inti = 0; i < size - 1; ...
## LeetCode 232classMyQueue:def__init__(self):self.l1=[]## queue1 = l1self.l2=[]## queue2 = l2defpush(self,x:int)->None:## Push x onto stackself.l1.append(x)## The right of the list = the top of the stack = the back of the queuedefpop(self)->int:## pop 抽取## ...
int pop()Removes the element on the top of the stack and returns it. int top()Returns the element on the top of the stack. boolean empty()Returnstrueif the stack is empty,falseotherwise. Notes: You must useonlystandard operations of a queue, which means that onlypush to back,peek/pop...
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...
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 Depending on your language, queue may not be supported natively. You may simulate a queue by using a...
You may assume that all operations are valid (for example, no pop or top operations will be called on an empty stack). 要求使用双队列实现一个栈的所有的功能,是一个很经典的问题,需要记住学习。 建议和这道题leetcode 232. Implement Queue using Stacks 双栈实现队列 一起学习。
(self):"""Initialize your data structure here."""# 声明两个队列,由于模拟栈self.queue1 = deque()self.queue2 = deque()# self._empty指向当前空的队列self._empty = self.queue1# self._filled指向当前有填充的队列self._filled = self.queue2def push(self, x):"""Push element x onto stack....
class Stack: # initialize your data structure here. def __init__(self): self.q_ = Queue() # @param x, an integer # @return nothing def push(self, x): self.q_.push(x) for _ in xrange(self.q_.size() - 1): self.q_.push(self.q_.pop()) # @return nothing ...
}// Return whether the stack is empty.boolempty(){returnq1.empty() && q2.empty(); }private: queue<int> q1; queue<int> q2;voidgather(queue<int>& q1, queue<int>& q2){while(!q2.empty()) { q1.push(q2.front()); q2.pop(); ...