F - Deforestation
Codeforces Round #392 (Div. 2) C. Unfair Poll
Codeforces Round #394 (Div. 2) D. Dasha and Very Difficult Problem
Codeforces Round #397 by Kaspersky Lab and Barcelona Bootcamp (Div. 1 + Div. 2 combined) D. Artsem and Saunders
Codeforces Round #396 (Div. 2) C. Mahmoud and a Message
VK Cup 2017 - Qualification 1 C. Cycle In Maze
8 Divisible
Acronyms
Cut the Tree
Disjoint Tree Paths