June Challenge 2018 Division 2
Vision, Two Flowers, Naive Chef, Sheokand and String, Binary Shuffle
August Challenge 2018 Division 2
Coordinate Compression , Modular GCD, Problem Sort, Sheokand and Number, Spell Bob
September Challenge 2018 Division 1
Bad Shuffle, Table Game, Sasha and Photos, AND Square Subsegments
December Challenge 2018 Division 1
(Challenge) Delete DAG, Colorblind Feast, Max and Electrical Panel, Directing Edges, Edge Addition, Chef and Interactive XOR
November Challenge 2018 Division 1
Binary Strings, Magician versus Chef 2, Chef, Primes and Trees (Challenge), Appy Loves One, Good Median
October Challenge 2018 Division 1
Appy and Balloons , Beautiful Bricks, Minimize Digitsum, Chef and Surprise Chessboard, Coprime Components, Chef and Serves, Byte to Bit, Distinct Rows in Submatrices
February Challenge 2019 Division 1
Guess It Right, Maximize the Tax, Art of Balance, Yet Another Tree Problem, Xor Decomposition, Chef and Secret Ingredients, Manhattan Rectangle
March Challenge 2019 Division 1
Chef and Soccer, Cheating on Queue, Treasure Hunt, Yet Again a Subarray Problem
Vietnam