September Challenge 2016
Chef and digits of a number, Faded Palindromes
February Challenge 2017
Chef and His Apartment Dues
May Challenge 2017
Chef and his daily routine, Courses in an university, Blocked websites, Median of adjacent maximum numbers
June Challenge 2017
A Good Set, Chef and the Feast, Xenny and Coin Rankings, Pairwise union of sets
July Challenge 2017
IPC Trainers, Calculator , Chef and Sign Sequences, Whats in the Name
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, Fill The Matrix, Chef and Pick Digit, Sereja and Commands
October Challenge 2017
Max Mex, A Balanced Contest
July Cook-Off 2017
Chang and Bitwise OR, Chang and the Perfect Function
October Cook-Off 2017
Chef and Employment Test, Chef and Weird Queries
December Cook-Off 2017
Beautiful Array, Football Match
June Lunchtime 2017
Maximum Unique Segment, Two Numbers
September Lunchtime 2017
Chef and Cook-Off Contests
February Challenge 2018
Chef And His Characters, Chef And The Patents, Akanksha and End of Semester, Permutation and Palindrome
February Cook-Off 2018
Chef and Cook-Off, Chef and Tuples, Chef and Line
February Lunchtime 2018
Game with numbers, Jumping in the hills
March Challenge 2018 DIV 1
Chef and Easy Problem, Mix the Colors, Minions and Voting
India