October Challenge 2015
Count Subarrays, Who dares to be a millionaire
September Mega Cook-Off 2015
Forgotten Language, Stacks
August Challenge 2016
Chef and Circle Run, Chef and Chocolate, Chef and Round Run
September Challenge 2016
Chef and Friends, Dividing Machine, Chef and digits of a number, Faded Palindromes, Chef and calculation
October Challenge 2016
Chef and Keyboard, Chef and Three Dogs
July Cook-Off 2016
Chef and Numbers, Chef and Proportion
March Challenge 2017
Xenny and Alternating Tasks, Bear and Extra Number
August Long Challenge 2017
Chef and Rainbow Array, Chef and Mover, Palindromic Game, Greedy Candidates
December Challenge 2017
Total Diamonds, Chef And his Cake, Chef And Easy Xor Queries, Penalty Shoot-out, Chef and Hamming Distance of arrays
March Challenge 2018 DIV 2
A Big Sale, Chef and Glove
India