September Challenge 2017
Chef and Pick Digit, Little Chef and Sums, Minimum Good Permutation
October Challenge 2017
Max Mex, A Balanced Contest
November Challenge 2017
Chef Hates Palindromes, Chef goes Left Right Left, Periodic Palindrome Construction, Villages and Tribes
December Challenge 2017
Chef and Hamming Distance of arrays, Penalty Shoot-out, Chef And his Cake, Total Diamonds
September Cook-Off 2017
Statistics Construction, Subsequence Equality
January Challenge 2018
K-Concatenation, Maximum Score, Rectangle, Partition the numbers
January Lunchtime 2018
Chef and Game with Sequence
February Challenge 2018
Chef And The Patents, Akanksha and End of Semester, Car-pal Tunnel, Permutation and Palindrome, Chef And His Characters
February Cook-Off 2018
Chef and Cook-Off, Chef and Tuples
February Lunchtime 2018
Game with numbers, Jumping in the hills
March Challenge 2018 DIV 1
Minions and Voting, Mix the Colors, Chef and Easy Problem
April Challenge 2018 Division 1
Chef and Array (Challenge), Highway Crossing, Count Good Prefixes
September Challenge 2018 Division 1
Chef and Condition Zero (Challenge), Bad Shuffle
August Lunchtime 2018 Division 1
Chef and Eid, Mix Mix Game
India