CSU 1811 Tree Intersection(线段树+启发式合并 解法)

转自:http://m.blog.csdn.net/hackertom/article/details/71304826 Problem acm.csu.edu.cn/csuoj/problemset/problem?pid=1811 vjudge.net/contest/161962#problem/I Reference blog.csdn.net/qwb492859377/article/d
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