April Challenge 2015
Chef and Interview, Broken Telephone, Inversion sorting, Chef and Piano Scales, Count Sequences
May Challenge 2015
Chef and Prime Divisors, Set Difference , Chef and new recipe
May Challenge 2016
Chef and math, Laddu, Chef and Big Soccer, Chef and Amazingness of Numbers, Forest Gathering, Chef and Balls, Sereja and GCD 2
June Challenge 2016
Devu and an Array, Chef and cities, Chef and Coins Game, Chef And Binary Operation, Chef and New Game, Chef and Rectangle Array, Chef And The Hiring Event, Chef and Array and K
July Challenge 2016
Andrash and Stipendium, Chef and Segments, Chef and Tetris, Chef and special numbers, Chef and Robots Competition, Chefland and Electricity, Scheduling jobs on a cluster
August Challenge 2016
Chef and Circle Run, Maximum Grid, Funny gnomes, Chef and Round Run, Chef and Chocolate, Fighting Ebola, Chef and His Garden
September Challenge 2016
Chef and Friends, Chef and digits of a number, Faded Palindromes, Chef and calculation
May Challenge 2018 Division 1
S-T Mincut, Change the Signs, Fake Binary Search, Dibs on Fibs
South Korea