（三）在铁路、城市轨道交通线路、桥梁、隧道、涵洞处挖掘坑穴、采石取沙的；
NYT Connections hints today: Clues, answers for February 28, 2026
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Notice how the highlighted region shrinks at each step. The algorithm never examines points outside the narrowing window. In a balanced tree with nnn points, this takes about log4(n)\log_4(n)log4(n) steps. For a million points, that's roughly 10 steps instead of a million comparisons.
41. 深刻把握“五个必须” 推动“十五五”良好开局 - 共产党员网, www.12371.cn/2026/01/13/…