January Challenge 2015
Chef and Stones, Sereja and Votes
October Challenge 2015
Count Subarrays, Who dares to be a millionaire
September Challenge 2016
Chef and digits of a number, Faded Palindromes, Chef and calculation
June Challenge 2017
Pairwise union of sets, Triplets, Xenny and Coin Rankings, A Good Set, Chef and Prime Queries, Chef and the Feast
August Long Challenge 2017
Chef and Rainbow Array, Chef and Mover, Palindromic Game, Greedy Candidates
September Mega Cook-Off 2018 Division 2
ATM Machine, Make a Permutation
August Lunchtime 2018 Division 2
Chef and Problem Setting, Chef and Eid, Mix Mix Game
August Challenge 2019 Division 2
Guddu and his Mother, Dilemma, Football, Distribute Apples, Zombie and the Caves
India