July Challenge 2017
Whats in the Name, Calculator
September Challenge 2017
Chef and Pick Digit, Minimum Good Permutation, Little Chef and Sums
October Challenge 2017
Chef and Cycled Cycles, A Balanced Contest, Counter Test For CHEFSUM, Max Mex, 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, Periodic Palindrome Construction, Villages and Tribes
December Challenge 2017
Total Diamonds, Chef and Hamming Distance of arrays, Penalty Shoot-out, Chef And his Cake, Chef and Universe, Chef And Easy Xor Queries
September Cook-Off 2017
Statistics Construction, Subsequence Equality
October Cook-Off 2017
Chef and Counting Test, Chef and Employment Test, Chef and Weird Queries
November Cook-Off 2017
Random Pair, Online Chess, Skiing
January Challenge 2018
K-Concatenation, Maximum Score, Rectangle, String Merging, Partition the numbers
February Challenge 2018
Chef And His Characters, Chef And The Patents, Permutation and Palindrome
India