July Challenge 2016
Chefland and Electricity, Andrash and Stipendium
August Challenge 2016
Chef and Circle Run, Chef and Chocolate, Chef and Round Run
September Challenge 2016
Faded Palindromes, Chef and calculation, Chef and digits of a number, Dividing Machine, Chef and Friends
October Challenge 2016
Sereja and Progressions, Chef and Keyboard, Fenwick Iterations, Chef and Three Dogs
November Challenge 2016
Count Permutations, Task for Alexey, Chef and squares, Gift and Chef, Friends Meeting
March Challenge 2017
Cooking Schedule, Xenny and Alternating Tasks, Bear and Extra Number, (CH) Bear and Sorted Rows, Bandwidth of a matrix
April Challenge 2017
Chef and Divisor Tree, Similar Dishes, Bear and Clique Distances, Dish Of Life, Stable market, Bear and Row 01
May Challenge 2017
Chef and Sub Array , Chef and his daily routine, Courses in an university, Blocked websites, Median of adjacent maximum numbers, Chef and Subsequences
June Challenge 2017
Chef and the Feast, Pairwise union of sets, Triplets, Xenny and Coin Rankings, A Good Set, Chef and Prime Queries
August Long Challenge 2017
Chef and Rainbow Array, Chef and Mover
August Challenge 2018 Division 2
Modular GCD, Problem Sort, Sheokand and Number, Spell Bob
India