pop_stack[-1] def empty(self) -> bool: # 当两个栈都为空是,队列才为空 return not self.push_stack and not self.pop_stack def transfer(self): # 如果 pop 栈为空,则需要将当前 push 栈中的元素转移到 pop 栈中, # 这样就将先进后出转换为了先进先出 if not self.pop_stack: while self....
## 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...
与出队操作类似,当输出栈outStack不为空时,只需要返回输出栈outStack的栈顶元素即可。不同的是,由于我们用变量front存储了输入栈最先进入的元素,因此,当输出栈outStack为空时,不需要再将输入栈inStack的元素弹出并压入到输出栈outStack中便可以得到当前队首的元素。 /** Get the front element. */publicintpee...
*/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...
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...
LeetCode 232. Implement Queue using Stacks 题目 class MyQueue { public: int stack[100005]; int stack2[100005]; int pos; int pos2; /** Initialize your data structure here. */ MyQueue() { } /** Push element x to the back of queue. */...
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。
A classic interview question.This linkhas a nice explanation of the idea using two stacks and its amortized time complexity. I use the same idea in my code, which is as follows. 1classQueue {2public:3//Push element x to the back of queue.4voidpush(intx) {5stack1.push(x);6}78//...
用两个栈实现队列:https://leetcode.cn/problems/implement-queue-using-stacks/submissions/564009874/ 🌉stack的模拟实现 从栈的接口中可以看出,栈实际是一种特殊的vector,因此使用vector完全可以模拟实现stack。 stack.c 代码语言:javascript 代码运行次数:0 ...
pythonswiftstackqueuealgorithmsleetcodegraphtriepython3binary-search-treeheaptree-structureleetcode-solutionsdynamic-programmingbinary-heapbinary-searchleetcode-pythonleetcode-swiftswift-5algoexpert UpdatedAug 18, 2022 Python danielm/uploader Star1.2k