publicclassMyStack{ Queue<Integer> q;publicMyStack(){// int size():获取队列长度;//boolean add(E)/boolean offer(E):添加元素到队尾;//E remove()/E poll():获取队首元素并从队列中删除;//E element()/E peek():获取队首元素但并不从队列中删除。q
returnqueue1.empty() && queue2.empty(); } }; 其他解法: 【两个队列】用两个队列myStack,temp实现一个栈。push时把新元素添加到myStack的队尾。pop时把myStack中除最后一个元素外逐个添加到myStack中,然后pop掉myStack中的最后一个元素,然后注意记得myStack和temp,以保证我们添加元素时始终向temp中添加。
## 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## ...
Description Implement the following operations of a stack using queues. push(x) -- Push element x onto stack. pop() -- Removes the element on top of the stack. top() -- Get the top element. empty() -- Return whether the stack is empty. Example: MyStack stack = new MyStack();sta...
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...
class MyStack { public: /** Initialize your data structure here. */ MyStack() { } /** Push element x onto stack. */ void push(int x) { queue<int> que; while(!m_stk.empty()) { que.push(m_stk.front()); m_stk.pop(); ...
当headStack 中没有元素时,将 tailStack 中所有的元素都 push 进 headStack 中。 这样一来,就用两个栈模拟了队列的出入顺序。 我们来看一下代码实现: 代码语言:javascript 代码运行次数:0 运行 AI代码解释 publicclassCQueue{//定义两个栈Deque<Integer>headStack,tailStack;publicCQueue(){headStack=newLinkedL...
}// Return whether the stack is empty.boolempty(){returnq1.empty() && q2.empty(); }private: queue<int> q1; queue<int> q2;voidtoQ1(queue<int>& q1, queue<int>& q2){if(q1.empty()) { q1 = q2; queue<int> q; q2 = q; ...