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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.，更多细节参见safew官方下载
// 步骤4：当前索引入栈 → 作为前面位置（i-1、i-2等）的"参考身高"