Fibonacciness
https://vjudge.net/problem/CodeForces-2060A;Farmer John’s Card Game
https://vjudge.net/problem/CodeForces-2060B;Game of Mathletes
https://vjudge.net/problem/CodeForces-2060C;Subtract Min Sort
https://vjudge.net/problem/CodeForces-2060D;Graph Composition
https://vjudge.net/problem/CodeForces-2060E;Minimal Coprime
https://vjudge.net/problem/CodeForces-2063A;