n.跨度；拉線；[數(shù)]生成；長(zhǎng)成
動(dòng)詞span的現(xiàn)在分詞形式.
Study on the Problem of Constrained Minimum Spanning Tree. 約束最小生成樹問(wèn)題研究。
There is a recursive formula for the number of spanning trees in a graph. 對(duì)于一個(gè)圖的生成樹的棵數(shù)，存在一個(gè)遞推公式。
