VK Cup 2018 - Round 1

2 problems from VK Cup 2018 - Round 1 (contest 923), difficulty 1700-3200. 1/2 solutions verified against sample I/O.

2 items

VK Cup 2018 - Round 1

Special | 2 problems | 1/2 verified | Difficulty 1700-3200 | 3m 7s

#	Problem	Rating	Tags	Accepted	Time	✓
A	Primal Sport	1700	math, number-theory	5,419	1m 16s	✓
F	Public Service	3200	constructive-algorithms, graphs, trees	131	1m 51s

Practice › Codeforces Solutions › VK Cup 2018 - Round 1 ›

CF 923F - Public Service

We are given two different trees on the same number of cities. One tree describes bus connections between cities labeled from 1 to N. The other tree describes train connections between cities labeled from N+1 to 2N.

Practice › Codeforces Solutions › VK Cup 2018 - Round 1 ›

CF 923A - Primal Sport

We are given the value of the game after two moves, call it $X2$. The game starts from some unknown integer $X0 ge 3$, and two players alternately modify this value.