May Cook-Off 2015
Devu and friendship testing, Devu and decorating birthday cake
June Lunchtime 2015
Chef and Submatrix, Chef and Two Strings
June Challenge 2016
Chef and cities, Devu and an Array, Chef and Coins Game, Chef And Binary Operation, Chef and Array and K, Chef and Rectangle Array, Chef And The Hiring Event
March Challenge 2017
Cooking Schedule, Completing favorite game, Xenny and Alternating Tasks, Pishty and birthday, Bear and Extra Number, (CH) Bear and Sorted Rows, Bandwidth of a matrix
April Challenge 2017
Similar Dishes, Bear and Clique Distances, Bear and Row 01, Dish Of Life, Chef and Divisor Tree, Bear and Random Grid, Chef and Digits, Stable market
May Challenge 2017
Chef and Sub Array , Long Sandwich , Gotham PD, Chef and his daily routine, Courses in an university, Blocked websites, Median of adjacent maximum numbers, Chef and Subsequences
June Challenge 2017
Xenny and Coin Rankings, Pairwise union of sets, Triplets, Cloning, A Good Set, Chef and Prime Queries, Chef and the Feast
May Cook-Off 2017
La Liga, Balanced Array, Hussain Set, Nasty Queries
October Challenge 2018 Division 1
Appy and Balloons , Distinct Rows in Submatrices, Coprime Components, Chef and Surprise Chessboard, Minimize Digitsum, Beautiful Bricks
June Lunchtime 2018 Division 1
Sort the Leaves, Permutation Composition Queries, Summary Power
Bulgaria