Remove Exactly Two ( Codeforces Round 1000 (Div. 2) )Recently, Little John got a tree from his aunt to decorate his house. But as it seems, just one tree is not enough to decorate the entire house. Li

Knapsack（ The 2023 ICPC Asia Nanjing Regional Contest (The 2nd Universal Cup. Stage 11: Nanjing) ）Little Cyan Fish, an inexperienced businessman, recently launched a store named Queen’s Organic Jewelr

The 2023 ICPC Asia Shenyang Regional Contest (The 2nd Universal Cup. Stage 13: Shenyang) C. Swiss Stage D. Dark LaTeX vs. Light LaTeX E. Sheep Eat Wolves I. Three Rectangles J. Graft and Transplant K.

Storage Problems ( 2020-2021 ICPC Central Europe Regional Contest (CERC 20) )The gangsters did a very successful robbery of the city’s most famous auction house. Now they are safely at their hideout,

Andrea is a famous science fiction writer, who runs masterclasses for her beloved readers. The mostpopular one is the Alien Communication Masterclass (ACM), where she teaches how to behave if youencou

Game with Binary String ( Educational Codeforces Round 175 (Rated for Div. 2) )Consider the following game. Two players have a binary string (a string consisting of characters 0 and/or 1). The players

Friends and Pizza (Educational Codeforces Round 175 (Rated for Div. 2))Monocarp hasnn pizzas, theii-th pizza consists ofaiai​slices. Pizzas are denoted by uppercase Latin letters from A to thenn-th le

Tree Jumps ( Educational Codeforces Round 175 (Rated for Div. 2) )You are given a rooted tree, consisting ofnn vertices. The vertices in the tree are numbered from11 tonn, and the root is the vertex11