思路：倒序遍历 + 单调索引栈（仅存索引），计算下一个高温的间隔天数。栈顶索引 - 当前索引即为等待天数。
// 易错点4：仅处理栈非空的情况，忽略栈空的情况 → 栈空时res[i]会是undefined
，更多细节参见夫子
optimizations is causing correctness or (negative) performance issues
The American private prison operator running Australia’s immigration network used an unsecured and unmodified Kia Carnival to transport a detainee who allegedly stabbed two of its staff during the journey and fled.