July Challenge 2017
Tree Expectancy, Whats in the Name, Calculator , IPC Trainers, Chef and Sign Sequences
August Long Challenge 2017
Chef and Rainbow Array, Chef and Mover, Palindromic Game, Mathison and the Data Warehouse (Challenge), Greedy Candidates
September Challenge 2017
Chef and Pick Digit, Little Chef and Sums, Minimum Good Permutation
January Challenge 2018
K-Concatenation, Maximum Score, Rectangle, String Merging, Partition the numbers
February Challenge 2018
Broken Clock, Permutation and Palindrome, Car-pal Tunnel, Points Inside A Polygon, Chef And The Patents, Chef And His Characters
March Challenge 2018 DIV 1
Pishty and Triangles, Chef and Easy Problem, Chef and Gcd Queries, Mix the Colors, Minions and Voting
February Challenge 2019 Division 1
Manhattan Rectangle, Guess It Right, Chef and Secret Ingredients, Art of Balance
April Challenge 2019 Division 1
Kira Loves Palindromes, Mininum XOR over Tree, Playing with Numbers, Subtree Removal
Azerbaijan