"On a simple level, you can use sheets or covers over areas where things might be damaged. You can put wax coating on things like brass so that the urine doesn't damage it."
// 易错点2：漏写stack.length判断 → 栈空时访问stack[-1]会报错
。业内人士推荐heLLoword翻译官方下载作为进阶阅读
用产品经理的心态对待咖啡，不断迭代好喝的咖啡。公众号：咖啡平方
if (n <= 1) return;