[061] Nearest Neighbour

[061] Nearest Neighbour

[40h] reasearch into nearest neighbour search

[Jun 04] 03h - Naive
[Jun 05] 07h - Sort Algorithms
[Jun 06] 13h - Heap Sort
[Jun 09] 03h - Kd Tree
[Jun 10] 07h - Kd Tree Array
[Jun 11] 04h - Quicksort
[Jul 07] 03h - Upload
* life happened

* build tree to avoid checking each unit
* good when you don't need to build tree often