November Challenge 2017
Periodic Palindrome Construction, Villages and Tribes, Chef goes Left Right Left
December Challenge 2017
Chef and Universe, Total Diamonds, Chef And his Cake, Chef And Easy Xor Queries, Penalty Shoot-out, Red and blue points, Chef and Hamming Distance of arrays
November Cook-Off 2017
Skiing, Online Chess, Random Pair
September Lunchtime 2017
Chef and Dice, Chef and Cook-Off Contests
January Challenge 2018
K-Concatenation, Maximum Score, Rectangle, String Merging, Partition the numbers
August Cook-Off 2018 Division 2
GukiZ and Candies, Mixi Game, Balsa For The Three
August Lunchtime 2018 Division 1
Chef and Eid, Mix Mix Game
Bangladesh