August Long Challenge 2017
Chef And Fibonacci Array, Chef and Rainbow Array, Strings and Graphs, Greedy Candidates, Mathison and the Data Warehouse (Challenge), Walks on the binary tree, Hill Jumping, Chef and Mover, Palindromic Game
September Challenge 2017
Weasel finds Staircase, Little Chef and Sums, Fill The Matrix, Weasel does Xor on Tree, Sum of Cubes, Minimum Good Permutation, Chef and Pick Digit, Sereja and Functions (Challenge), Sereja and Commands
November Challenge 2017
Chef Hates Palindromes, Chef and Subarray Queries, 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 Easy Xor Queries, Total Diamonds, Chef And his Cake
August Lunchtime 2017
Mathison and the Dynamo shuffle, Mathison and pangrams
March Challenge 2018 DIV 1
Pishty and Triangles, Chef and Interval Painting, Chef Cuts Tree, Chef and Easy Problem, Chef and Gcd Queries, Mix the Colors, Minions and Voting
April Challenge 2018 Division 1
Vaibhav and Ministers, Chef and Same Old Recurrence 2, Count Good Prefixes, Chef and Same Old Recurrence, Highway Crossing, Cutting Plants, Chef at the Food Fair, Chef and Array (Challenge)
June Challenge 2018 Division 2
Two Flowers, Expected Buildings, Sheokand and String, Naive Chef
July Challenge 2018 Division 1
Reach Equilibrium, No Minimum No Maximum
China