July Challenge 2017
Chef and Sign Sequences, IPC Trainers, Calculator , Pishty and tree, Whats in the Name
September Challenge 2017
Sereja and Commands, Chef and Pick Digit, Minimum Good Permutation, Sum of Cubes, Weasel finds Staircase, Fill The Matrix, Little Chef and Sums
October Challenge 2017
Chef and Horcrux, (Challenge) Connecting computers, A Balanced Contest, Counter Test For CHEFSUM, Max Mex, Shooting on the array, Chef and Cycled Cycles, Chef and a great voluntary Program, Chef and Magic Arrays
November Challenge 2017
Chef Hates Palindromes, Chef and Subarray Queries, Chef goes Left Right Left, Lovers Gift, Periodic Palindrome Construction, Villages and Tribes
December Challenge 2017
Chef and Hamming Distance of arrays, Red and blue points, Penalty Shoot-out, Chef And Easy Xor Queries, Chef, Leonardo And Queries, Santa Delivering Problem, Total Diamonds, Chef and Universe, Chef and Direction, Chef And his Cake
November Lunchtime 2017
Smart Strategy, Shuffling, L-R queries
December Lunchtime 2017
Days in Month, Strange Function
January Challenge 2018
String Merging, Partition the numbers, Rectangle, Maximum Score, Killjee and k-th letter , A humongous Query, Killing Monsters, K-Concatenation
February Challenge 2018
Permutation and Palindrome, Car-pal Tunnel, Chef and odd queries, Chef And The Patents, Chef And His Characters, Chef And Land Labeling
June Challenge 2019 Division 1
Lent Money, Count Arrays, Chef and Ingredients, Chef and His Dish, Intersecting Paths, Sum and GCD, Forgotten Tree 9, (Challenge) SnackDown 99
China