Little penguin Polo has got a tree — a non-directed connected acyclic graph, containing n nodes and n - 1 edges. We will consider the tree nodes numbered by integers from 1 to n. Today Polo wonders, how to find the number of pairs of paths that don't have common nodes. More ...
aOr you come in the morning, or you put the money in here, I help you recharge 正在翻译,请等待...[translate] acmos camera cmos照相机[translate] aCan crocodiles climb trees? 鳄鱼能否爬树?[translate] aPOLO-DVD POLO-DVD[translate]
When Marco Polo left China, he passed through Hangzhou (Quinsai) and then travelled approximately southwestwards into what is today Fujian province, to the cities of Fuzhou and Quanzhou (Zaiton). There are still a number of disagreements regarding his ro
Theytradedtreesfordifferentkindsofpaper. 他们用树木换得各种纸张. Marco'sfatheranduncleweretraders. Easternadj.朝东的,东方的,东部的 Westernadj.朝西的,西方的,西部的 Centraladj.中央的,中心的,中部的,主要的 ChinaisanEasterncountrywhileFranceisa ...