January Challenge 2018
K-Concatenation, Maximum Score, Rectangle, Partition the numbers
February Challenge 2018
Chef And His Characters, Chef And The Patents, Car-pal Tunnel, Permutation and Palindrome
March Challenge 2018 DIV 2
Mix the Colors, Chef and Glove, A Big Sale, Chef and Easy Problem
March Lunchtime 2018 Division 2 (Unrated)
Chef and Friends, Three Integers, Magic Elements
April Challenge 2018 Division 2
Weight of Numbers, Highway Crossing, Count Good Prefixes, Average of Pairs, Workers
June Challenge 2018 Division 2
Vision, Naive Chef, Sheokand and String, Binary Shuffle
July Challenge 2018 Division 2
Reach Equilibrium, No Minimum No Maximum, Magic Set, Strike or Spare, No Strings Attached
October Challenge 2018 Division 1
Chef and Surprise Chessboard, Minimize Digitsum, Beautiful Bricks, Appy and Balloons
October Challenge 2019 Division 1
Even Edges, Chef and Maximum Star Value, Array Modification, (Challenge) Maximizing LIS
May Challenge 2020 Division 1
Triple Sort, Chef and Bitwise Product
Biteration #2 (Rated for Division 2)
A - Books, B - Candy Love, C - Chef and Maths
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