December Challenge 2017
Chef And his Cake, Total Diamonds, Chef and Hamming Distance of arrays, Penalty Shoot-out
December Lunchtime 2017
Days in Month, Strange Function
January Challenge 2018
K-Concatenation, Maximum Score, Rectangle, String Merging, Partition the numbers
April Challenge 2018 Division 1
Cutting Plants, Highway Crossing, Count Good Prefixes
May Challenge 2018 Division 1
Dibs on Fibs, Fake Binary Search
December Challenge 2018 Division 1
Max and Electrical Panel, Directing Edges, Chef and Interactive XOR
November Challenge 2018 Division 2
Chef and Ridges, Appy Loves One, Good Median, Magician versus Chef 2, Chef and Difficult Contests, Chef and Happiness
October Challenge 2018 Division 1
Chef and Surprise Chessboard, Beautiful Bricks, Appy and Balloons , Minimize Digitsum
February Challenge 2019 Division 1
Manhattan Rectangle, Guess It Right, Chef and Secret Ingredients, Xor Decomposition, Art of Balance
March Challenge 2019 Division 1
Chef and Soccer, Cheating on Queue, Yet Again a Subarray Problem
April Challenge 2019 Division 1
Playing with Numbers, Subtree Removal, Mininum XOR over Tree, Kira Loves Palindromes
February Challenge 2020 Division 1
Chef and Railway Stations, Expected Change, No Change Required, Long Contest and Cook Off Overlaps
January Challenge 2021 Division 2
Chef and Ants, Expected Number of SCCs, Watching CPL, Fair Elections
C.O.D.E.R.S Division 2 (Rated)
The One On The Last Night, The One with Ross Wedding
Azerbaijan