* 1. 转换视角：将"追车"问题转为"到达时间"比较（后车时间≤前车 → 合并）；
DENVER—The Global Positioning System is one of the few space programs that touches nearly every human life, and the stewards of the satellite navigation network are eager to populate the fleet with the latest and greatest spacecraft.
，这一点在WPS官方版本下载中也有详细论述
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Step 3: Refine with Detailed Shortcuts (Applying Secret Sauce #2):