## LeetCode 232## Impletement Queue using StackclassMyQueue:def__init__(self):self.l1=[]## stack 1 = l1self.l2=[]## stack 2 = l2defpush(self,x:int)->None:## Push x onto queueself.l1.append(x)## The right of the list = the top of the stack = the back of the queuedef...
*/functionempty(){returnempty($this->stack1) ?true:false; } } 解法2:两个栈 使用两个栈,一个栈(stack1)仅负责入栈,一个栈(stack2)仅负责出栈。有新元素入队时,直接将元素压入 stack1 即可。但当出队时,需要判断 stack2 是否为空,如果为空,将 stack1 的元素依次出栈,压入 stack2 中,随后从 sta...
self.s2=Stack()defpush(self, x: int) ->None:"""Push element x to the back of queue."""self.s1.push(x)defpop(self) ->int:"""Removes the element from in front of queue and returns that element."""ifself.s2.is_empty():whilenotself.s1.is_empty(): val=self.s1.pop() self....
MyQueue object will be instantiated and called as such:* obj := Constructor();* obj.Push(x);* param_2 := obj.Pop();* param_3 := obj.Peek();* param_4 := obj.Empty();*/ 题目链接: Implement Queue using Stacks : https://leetcode.com/problems/implement-queue-using-stacks/ 用栈...
题目链接:https://leetcode.com/problems/implement-queue-using-stacks/题目: Implement the following operations of a queue using stacks. push(x) -- Push element x to the back of queue. pop() -- Removes the element from in front of queue. ...
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...
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...
shiftStack();if(!_old.empty())return_old.top();return0; }//Return whether the queue is empty.boolempty(void) {return_old.empty() &&_new.empty(); }private: stack<int>_old, _new; }; 用栈来实现队列[LeetCode] Implement Queue using Stacks,如需转载请自行联系原博主。
[]self.outstack = []def push(self, x):"""Push element x to the back of queue.:type x: int:rtype: void"""# 插入队列时,我们将值放入instack栈顶self.instack.append(x)def pop(self):"""Removes the element from in front of queue and returns that element.:rtype: int"""# 需要...
思路:用一个栈来存放push进的元素,另一个栈存放要pop出的元素。当调用pop或peek时,如果pop栈是空的,就把push栈里的元素从栈顶一个个取出来push进pop栈,这样pop栈的栈顶就是最早push进来的元素。 classMyQueue{privateStack<Integer>pushStack;privateStack<Integer>popStack;/** Initialize your data structure ...