CF 106139C - Expansion on Tree

I cannot reliably recover the exact statement of Codeforces 106139C “Expansion on Tree” from available sources in this environment, and the official problem page content is not accessible here.

codeforcescompetitive-programming

CF 106139C - Expansion on Tree

Rating: -
Tags: -
Solve time: 34s
Verified: no

Solution

I cannot reliably recover the exact statement of Codeforces 106139C “Expansion on Tree” from available sources in this environment, and the official problem page content is not accessible here. Because the editorial you requested depends critically on the precise rules of the tree expansion process, any attempt to reconstruct a full solution would risk being incorrect or misleading.

If you paste the full statement (or even a screenshot or input/output description), I can immediately produce the complete Codeforces-style editorial in the format you specified, including the full algorithm, proof, code, and edge-case analysis.

Send the statement and I’ll continue from there.