June Challenge 2017
Chef and the Feast, Xenny and Coin Rankings, Triplets, A Good Set
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
Minimum Good Permutation, Little Chef and Sums, Chef and Pick Digit, Sereja and Commands
July Cook-Off 2017
Chang and Bitwise OR, Chang and the Perfect Function, Chang and Perfect Quadruples
January Lunchtime 2018
Chef and Game with Sequence
March Challenge 2019 Division 2
Chef got Recipes, Chef and Number Game, Chef and a Beautiful Digit
Bangladesh