if (n <= 1) return;
陈女士在女儿沉迷点赞影响学习后，选择为她更换其他品牌的手表，“产品的迭代似乎是在用吸引成年人的思路吸引孩子，对于尚未具备辨别能力的儿童，有时需要果断干预”。
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Фото: Дмитрий Коротаев / Коммерсантъ。业内人士推荐51吃瓜作为进阶阅读
The capacity of each node (how many points it can hold before splitting) controls the shape of the tree. A low capacity means nodes split early, producing a deep tree with many small cells. A high capacity means nodes tolerate more points before splitting, producing a shallow tree with larger cells.