臣附议
by FC_Viiiiictor_K @ 2019-07-25 21:44:01
# I agree.
by HuaJi_360 @ 2019-08-08 19:57:04
臣附议
by VTloBong @ 2019-10-11 07:49:05
此题的加强版在这
https://www.luogu.org/problem/P2986
多叉树，而且还需要O(n)换根DP
by RiverFun @ 2019-11-01 13:44:17