June Challenge 2016
Chef and Coins Game, Devu and an Array
May Challenge 2017
Chef and his daily routine, Median of adjacent maximum numbers
June Challenge 2017
A Good Set, Xenny and Coin Rankings
March Challenge 2018 DIV 2
A Big Sale, Mix the Colors, Chef and Glove
March Cook-off 2018 Division 2
Chef Judges a Competition
December Challenge 2018 Division 2
Chef and Interactive Contests
November Challenge 2019 Division 2
Hard Sequence, Weapon Value
December Challenge 2019 Division 2
Plus Multiply, That Is My Score!
January Challenge 2020 Division 2
Doraemon, Breaking Bricks
May Challenge 2020 Division 2
Coronavirus Spread, Isolation Centers
