January Challenge 2017
Cats and Dogs, Capital Movement, Reservior
February Challenge 2017
Eugene and big number, Chef and His Apartment Dues
June Challenge 2017
Chef and Prime Queries, A Good Set, Chef and the Feast, Xenny and Coin Rankings, Triplets, Pairwise union of sets
July Challenge 2017
Tree Expectancy, IPC Trainers, Calculator , Whats in the Name, Chef and Sign Sequences
August Long Challenge 2017
Chef and Rainbow Array, Chef and Mover, Palindromic Game, Greedy Candidates
November Challenge 2017
Chef goes Left Right Left, Periodic Palindrome Construction, Villages and Tribes, Chef Hates Palindromes
June Lunchtime 2017
Maximum Unique Segment, Two Numbers
September Lunchtime 2017
Chef and Cook-Off Contests
March Challenge 2018 DIV 2
Pishty and Triangles, Minion Chef and Bananas, Minions and Voting, Chef and Glove, Mix the Colors, A Big Sale, Chef and Easy Problem
April Challenge 2018 Division 1
Chef and Array (Challenge), Highway Crossing, Count Good Prefixes
India