Less Than (2): Everything in this space must be less than 2. The answer is 0-0, placed vertically.
// 计算天数：栈非空→栈顶索引-当前索引；栈空→0（易错点3：索引差别写反）
。业内人士推荐同城约会作为进阶阅读
В России ответили на имитирующие высадку на Украине учения НАТО18:04
Deaths of 56 babies at Leeds hospitals may have been preventable, BBC told
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