June Challenge 2017
Chef and the Feast, Xenny and Coin Rankings, A Good Set
July Challenge 2017
Chef and Sign Sequences, Tree Expectancy, 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
Sereja and Commands, Little Chef and Sums, Minimum Good Permutation, Chef and Pick Digit
January Challenge 2018
(Challenge) Chef and Palindromes, K-Concatenation, Maximum Score, Rectangle, String Merging, Partition the numbers
February Challenge 2018
Permutation and Palindrome, (Challenge) Biased Committee, Car-pal Tunnel, Chef And His Characters, Broken Clock, Chef And The Patents
March Challenge 2018 DIV 1
Chef and Easy Problem, Mix the Colors, Minions and Voting
April Challenge 2018 Division 1
Chef and Array (Challenge), Highway Crossing, Count Good Prefixes
May Challenge 2018 Division 2
Mighty Friend, Minimum Deletions, Xor Again, Fake Binary Search, Dibs on Fibs
June Challenge 2018 Division 2
Binary Shuffle, Naive Chef
July Challenge 2018 Division 2
Reach Equilibrium, Magic Set, Strike or Spare
August Challenge 2018 Division 2
Problem Sort, Sheokand and Number, Spell Bob
September Challenge 2018 Division 2
Magician versus Chef, War of XORs, Chef and Condition Zero (Challenge), Chef and Adventures, Table Game, Bad Shuffle
India