If an area does not have any color coding, it means there are no conditions on the portions of dominoes within those spaces.
Point lookups are useful, but the operation you'll reach for more often is a range query: give the tree a rectangular region and retrieve every point inside it, without scanning the entire dataset.
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这并非个例。调研数据显示，2025年，赵庄村带动周边区域开展研学8万余人次，仅此一项就实现销售收入110余万元。整个产业年产值更达4000余万元。
Фото: Thaier Al-Sudani / Reuters