Less Than (2): Everything in this space must be less than 2. The answer is 1-3, placed horizontally.
// 此时栈顶就是当前元素的"下一个更大值"（栈空则保持默认值0）
。关于这个话题，im钱包官方下载提供了深入分析
Alison Francis,Senior Science Journalist
The US Space Force owns and operates the GPS constellation, providing civilian and military-grade positioning, navigation, and timing signals to cell phones, airliners, naval ships, precision munitions, and a whole lot more.