For well-distributed points, nearest neighbor search is often near O(logn)O(\log n)O(logn) in practice. In the worst case (all points clustered tightly or along a line), it can degrade to O(n)O(n)O(n), but this is uncommon with typical spatial data.
int i = 0, j = 0, k = left; // i:左数组指针, j:右数组指针, k:原数组指针
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