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while (stack.length 0 && nums[stack[stack.length - 1]] <= curHeight) {，推荐阅读heLLoword翻译官方下载获取更多信息
const validatePromo = (cartContents) = {，详情可参考51吃瓜
local_port = 8001
An array has a type and a length, and the most common allocation operations