左手边五十米

摘要： Write a program that takes as input a rooted tree and a list of pairs of vertices. For each pair (u,v) the program determines the closest common ances 阅读全文

摘要： You are given an array d1,d2,…,dnd1,d2,…,dn consisting of nn integer numbers. Your task is to split this array into three parts (some of which may be 阅读全文