题解 | #用两个栈实现队列#

let s1 =[] let s2= []

function push(node) { // write code here s1.push(node) } function pop() { // write code here if(s2.length!=0){ return s2.pop() }else{ while(s1.length!=0){ s2.push(s1.pop()) } return s2.pop() } } module.exports = { push : push, pop : pop };