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.
（一）跨地级行政区（直辖市下辖县区）提供建筑服务；
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但营收增长的背后，是成本压力的持续凸显。外卖大战中，平台佣金、配送费用成为侵蚀利润的主要因素，瑞幸2025年第三季度配送费用支出高达28.9亿元，同比增长211%，导致盈利水平承压。
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