ACM

AI Translated from Chinese Problem Problem Statement Given a tree, for each node, consider the maximum value d such that after removing d edges, the node can still reach at least one other node. Compute the sum of these d values across all nodes. Input The first line contains an integer n (1 ≤ n ≤ 2×10^5), the number of nodes in the tree. The next n-1 lines contain edges of the tree. ...

Not too late to turn back, realize today is right and yesterday was wrong

First CF solution write-up

States and state transition equations

For example… the one-stroke problem?

Collision of Python and mathematics