September Challenge 2017
Minimum Good Permutation, Little Chef and Sums, Chef and Pick Digit
October Challenge 2017
Chef and a great voluntary Program, Max Mex, Counter Test For CHEFSUM, A Balanced Contest
November Challenge 2017
Villages and Tribes, Periodic Palindrome Construction, Chef goes Left Right Left, Chef Hates Palindromes
September Lunchtime 2017
Chef and Cook-Off Contests
August Challenge 2018 Division 2
Modular GCD, Problem Sort, Sheokand and Number, Spell Bob
September Challenge 2018 Division 2
War of XORs, Bad Shuffle, Table Game, Magician versus Chef, Chef and Adventures
October Challenge 2018 Division 1
Appy and Balloons , Beautiful Bricks, Minimize Digitsum, Chef and Surprise Chessboard
October Lunchtime 2018 Division 1
Coloring the Grid, Weird Question
September Challenge 2019 Division 1
Fuzzy Linear Combinations, Chef Designed a Network, Doofish Set, Expected GCD, Biladerim Icin
October Challenge 2019 Division 1
Even Edges, Bacterial Reproduction, Chef and Maximum Star Value, Array Modification, (Challenge) Maximizing LIS
India