スー・チー氏後継と目されたリーダーがなぜ軍主導の選挙に?
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// 易错点3：忘记stack.length判断 → 访问stack[-1]会报错
Shortcuts: For common scenarios, we pre-calculate the travel time/distance (the "shortcut") between border points within the same cluster and also to border points of immediately adjacent clusters.