November Challenge 2016
Chef and squares, Count Permutations, Task for Alexey
February Challenge 2017
Chef and Triangles, Chef and His Apartment Dues, Most Frequent Element, Gerrymander
March Challenge 2017
Xenny and Alternating Tasks, Bear and Extra Number, Bandwidth of a matrix
April Challenge 2017
Dish Of Life, Bear and Row 01, Similar Dishes
May Challenge 2017
Chef and Sub Array , Chef and his daily routine, Courses in an university, Blocked websites, Median of adjacent maximum numbers
June Challenge 2017
Pairwise union of sets, Triplets, Chef and the Feast, A Good Set, Xenny and Coin Rankings
July Challenge 2017
Chef and Sign Sequences, Tree Expectancy, Whats in the Name, Calculator , IPC Trainers
August Long Challenge 2017
Chef and Rainbow Array, Chef and Mover, Palindromic Game, Greedy Candidates
September Challenge 2017
Chef and Pick Digit, Little Chef and Sums, Fill The Matrix, Minimum Good Permutation, Sereja and Commands
October Challenge 2017
Chef and a great voluntary Program, Chef and Cycled Cycles, Max Mex, Counter Test For CHEFSUM, A Balanced Contest
February Challenge 2019 Division 1
Manhattan Rectangle, Chef and Secret Ingredients, Art of Balance
India