单调栈模板有共性，不必死记，按下面三步即可快速选型：
Artefacts found at the site are revealing more about the people buried here.
。Line官方版本下载对此有专业解读
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.
printArray(arr, n);