August Challenge 2015
Gravity Guy, Cooking Machine
October Challenge 2015
Count Subarrays, Who dares to be a millionaire
November Challenge 2015
Eugene and function, Chef and cakes
December Challenge 2015
Chef and the stones, Plane Division
March Challenge 2016
Palindromic substrings, maximize the sum
April Challenge 2016
Chef And Coloring, Chef And Magical Path, Chef and Ballons
February Challenge 2017
Chef and His Apartment Dues
March Challenge 2017
Xenny and Alternating Tasks, Bear and Extra Number, (CH) Bear and Sorted Rows, Bandwidth of a matrix
April Challenge 2017
Similar Dishes, Bear and Row 01, Dish Of Life
May Challenge 2017
Chef and his daily routine, Courses in an university, Median of adjacent maximum numbers
June Challenge 2017
A Good Set, Chef and the Feast, Xenny and Coin Rankings, Triplets, Pairwise union of sets
July Challenge 2017
Chef and Sign Sequences, Whats in the Name, Calculator
September Challenge 2017
Chef and Pick Digit, Minimum Good Permutation, Little Chef and Sums
October Challenge 2017
Max Mex, A Balanced Contest
November Challenge 2017
Chef goes Left Right Left, Villages and Tribes
December Challenge 2017
Chef And his Cake, Penalty Shoot-out
August Challenge 2019 Division 2
Dilemma, Football, Distribute Apples
May Challenge 2020 Division 2
Coronavirus Spread, Isolation Centers
India