March Challenge 2016
maximize the sum, Palindromic substrings
April Challenge 2016
Help Watson Escape, Chef and Ballons, Chef And Magical Path, Chef And Coloring
June Challenge 2016
Chef And The Hiring Event, Chef and Array and K, Chef And Binary Operation, Chef and Coins Game, Devu and an Array
July Challenge 2016
Chefland and Electricity, Chef and Tetris, Andrash and Stipendium
August Challenge 2016
Chef and Circle Run, Chef and Chocolate, Chef and Round Run
September Challenge 2016
Chef and Friends, Chef and digits of a number, Faded Palindromes, Chef and calculation
October Challenge 2016
Sereja and Progressions, Chef and Keyboard, Fenwick Iterations, Chef and Three Dogs
July Cook-Off 2016
Chef and Proportion, Chef and Numbers
July Lunchtime 2016
Drumpf for President!, Lumpy - The Bus Driver
February Challenge 2017
Chef and Triangles, Chef and His Apartment Dues, Gerrymander
March Challenge 2017
(CH) Bear and Sorted Rows, Bandwidth of a matrix, Bear and Extra Number, Xenny and Alternating Tasks
March Challenge 2018 DIV 2
Chef and Easy Problem, A Big Sale, Mix the Colors, Chef and Glove, Minions and Voting, Minion Chef and Bananas
August Lunchtime 2020 Division 2
Game on a Strip, Mode of Frequencies
India