September Challenge 2016
Chef and Friends, Dividing Machine, Chef and Matrix Division, Chef and digits of a number, Faded Palindromes, The New Restaurant, JosephLand, Chef and calculation, Chef and Cut
October Challenge 2016
Chef and Two String, Bear and Shuffled Points, Tree Balancing, Power Sums, Chef and Three Dogs, Big Queries, Sereja and Progressions, Chef and Keyboard, Sereja and Stones, Fenwick Iterations
November Challenge 2016
Chef and squares, Task for Alexey, Sereja and Ways in the Cube, Sereja and Permutations 3, Chef and Bike, Kirito in Memeland, Gift and Chef, Urban Development, Friends Meeting, Count Permutations
December Challenge 2016
Bear and Three Colours, Our Base is Under Attack, Chef and Finding Direction, Advanced Cooking Machine, Roses for Alexey, Sereja and Increasing subsequence, Kth Max Subarray, Train Partner, Kirito in labyrinth
January Challenge 2017
Fantastic Four, Tourists in Mancunia, Reservior, Digits Cannot Separate, Chef and Circle, Coprime 6-tuples, Sereja and BOX, Cats and Dogs, Capital Movement
March Challenge 2017
Sum of distances, Bandwidth of a matrix, Bear and Cat Trap, Bear and Extra Number, Pishty and birthday, Xenny and Alternating Tasks, Path Triples On Tree, Completing favorite game, Cooking Schedule
April Challenge 2017
Chef and Digits, Bear and Random Grid, Chef and Divisor Tree, Stable market, Dish Of Life, Bear and Row 01, Bear and Clique Distances, Similar Dishes
China