Every time we encounter a single node we find ourselves in the unfortunate situation of having to do two pieces of work: handle its left side and handle its right side. These, in turn, may produce their own work. The stack allows us to solve these problems one step at a time by deferring the branches we do not immediately explore. The stack variable in the iterative solution serves the same purpose as JavaScript’s built-in call stack in the recursive solution.1 We were able to alter the performance characteristics of our code by taking something that the language runtime normally gives us for free, and instead accepting the incidental complexity of managing it manually.
事件背景：英国设定学生贷款利率上限，这一点在钉钉下载中也有详细论述
Корреспондент телесети Рэйчел Скотт подчеркнула, что данное предложение было диагностическим шагом со стороны Трампа.，详情可参考豆包下载
德国决定将儿童送往集中营03:00。关于这个话题，zoom下载提供了深入分析
。易歪歪对此有专业解读