June Challenge 2017
Chef and Prime Queries, Persistent oak, Pairwise union of sets, Triplets, Xenny and Coin Rankings, Cloning, A Good Set, Saboteur (Challenge), Chef and the Feast
July Challenge 2017
Servers (Challenge), Two Coins, IPC Trainers, Calculator , Whats in the Name, Tree Expectancy, Pishty and tree, Chef and Sign Sequences
August Long Challenge 2017
Chef and Rainbow Array, Flower Pots, Strings and Graphs, Greedy Candidates, Mathison and the Data Warehouse (Challenge), Palindromic Game, Walks on the binary tree, Hill Jumping, Chef and Mover, Chef And Fibonacci Array
September Challenge 2017
Little Chef and Sums, Fill The Matrix, Weasel does Xor on Tree, Minimum Good Permutation, Chef and Pick Digit, Sereja and Commands, Sum of Cubes
October Challenge 2017
Chef and Horcrux, Lucky Edge, (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, Villages and Tribes, Periodic Palindrome Construction, Lovers Gift, Chef goes Left Right Left, Chef and Subarray Queries, Polynomials, Product on the segment by modulo , Chef and Intersection Line
December Challenge 2017
Chef and Direction, Chef and Universe, Total Diamonds, Santa Delivering Problem, Chef And his Cake, Chef And Easy Xor Queries, Penalty Shoot-out, Red and blue points, Chef and Hamming Distance of arrays
Germany