Romance could be so simple if only we were two-dimensional. You just find the closest available partner and go for it. To find out who is closest, you might compute a distance measure. The Euclidean distance, which this post is about, is d(p,q)=(p1−q1)2+(p2−q2)2d(p,q) = sqrt{(p_1-q_1)^2 + (p_2-q_