May Challenge 2017
Chef and his daily routine, Chef and Sub Array , Median of adjacent maximum numbers, Courses in an university, Blocked websites
July Challenge 2017
Chef and Sign Sequences, Whats in the Name, Calculator , IPC Trainers
August Long Challenge 2017
Chef and Rainbow Array, Chef and Mover, Palindromic Game, Greedy Candidates
September Challenge 2017
Chef and Pick Digit, Little Chef and Sums, Fill The Matrix, Minimum Good Permutation
November Challenge 2017
Chef Hates Palindromes, Chef goes Left Right Left, Periodic Palindrome Construction, Villages and Tribes
January Challenge 2018
Maximum Score, Rectangle, String Merging, Partition the numbers, K-Concatenation
October Challenge 2018 Division 1
Appy and Balloons , Beautiful Bricks, Minimize Digitsum, Chef and Surprise Chessboard
September Lunchtime 2018 Division 1
Chef Restaurant , Opposite Cites
January Challenge 2019 Division 1
Yet Another Problem About Sequences, Different Neighbours, Partition the Graph, Distinct Pairs
February Challenge 2019 Division 1
Chef and Secret Ingredients, Art of Balance
United States