题解 | #用两个栈实现队列#
用两个栈实现队列
https://www.nowcoder.com/practice/54275ddae22f475981afa2244dd448c6
/** 1. s1存储每次push的node 2. pop时,需要拿到s1最底下的node,需要s2辅助 3. s2存储s1pop的值直到s1为空栈,这样顺序就反过来了 4. s2在pop就模拟出了队列 */ let s1 = [] let s2 = [] function push(node) { s1.push(node) } function pop() { // write code here if(!s2.length){ while(s1.length){ s2.push(s1.pop()) } } return s2.pop() } module.exports = { push : push, pop : pop };