July Challenge 2016
Chefland and Electricity, Andrash and Stipendium
May Challenge 2017
Chef and his daily routine, Courses in an university, Median of adjacent maximum numbers
August Long Challenge 2017
Chef and Rainbow Array, Chef and Mover, Palindromic Game, Greedy Candidates
September Challenge 2017
Chef and Pick Digit, Little Chef and Sums, Fill The Matrix, Weasel does Xor on Tree, Minimum Good Permutation, Sereja and Commands
October Challenge 2017
A Balanced Contest, Counter Test For CHEFSUM, Max Mex, Shooting on the array, Chef and a great voluntary Program, Chef and Magic Arrays, Chef and Cycled Cycles
September Lunchtime 2017
Chef and Dice, Chef and Cook-Off Contests
January Challenge 2018
Rectangle, Partition the numbers, String Merging, Maximum Score, K-Concatenation
February Challenge 2018
Broken Clock, Chef And His Characters, Chef And The Patents, Points Inside A Polygon, Car-pal Tunnel, Permutation and Palindrome
India