树上斜率dp
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内容提要
BZOJ 1767. [Ceoi2009]harbingers | https://vjudge.net/problem/Z_trening-749 Luogu P2305. [NOI2014] 购票 http://acm.hdu.edu.cn/showproblem.php?pid=5956 https://codeforces.com/problemset/problem/1179/D...
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