比赛链接:http://codeforces.com/contest/400/
代码链接:https://github.com/9974/Codeforces/tree/master/234div2
A, B, C水题
D dfs判联通性+floyd最短路
E 按位拆成线段树，线段树区间合并问题
Codeforces Round #234 (Div. 2),布布扣,bubuko.com
Codeforces Round #234 (Div. 2)
原文：http://blog.csdn.net/auto_ac/article/details/20723555