2D游戏：快速（est）方式为另一个实体找到x最接近的实体 - 大量实体，高度动态

I'm working on a 2D game that has a huge amount of dynamic entities. For fun's sake, let's call them soldiers, and let's say there are 50000 of them (which I just randomly thought up, it might be much more or much less :)).I'm working on a 2D game that has a huge amount