12. World Economic Outlook Update, January 2026: Global Economy: Steady amid Divergent Forces - IMF, www.imf.org/en/publicat…
* 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）；
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Sometimes it takes a long time before I figure out what I actually want to write, and then everything falls into place: