September Challenge 2017
Chef and Pick Digit, Minimum Good Permutation, Sum of Cubes, Fill The Matrix, Little Chef and Sums, Sereja and Commands
October Challenge 2017
Chef and Magic Arrays, Chef and a great voluntary Program, Chef and Cycled Cycles, Max Mex, Counter Test For CHEFSUM, A Balanced Contest
December Challenge 2017
Chef And Easy Xor Queries, Chef and Hamming Distance of arrays, Red and blue points, Penalty Shoot-out, Chef And his Cake, Total Diamonds, Chef and Universe
September Cook-Off 2017
Infinite OR Game, Statistics Construction, Subsequence Equality
October Cook-Off 2017
Chef and Counting Test, Chef and Employment Test, Chef and Weird Queries
October Lunchtime 2017
Buggy Calculator, Maximum Number
July Cook-Off 2018 Division 1
OR Matrix, Chef and GCD Game
December Cook-Off 2018 Division 1
Yalalovichik Numbers, Yalalovichik Strings
India