使用最小距离总和将一组3D点映射到另一组

Given are two sets of three-dimensional points, a source and a destination set. The number of points on each set is arbitrary (may be zero). The task is to assign one or no source point to every destination point, so that the sum of all distances is minimal. If there are more source than destination points, the additional points are to be ignored.Given are two sets of three-dimensional points,