March Challenge 2014
Walk, Team Split, Little Chef and Numbers
May Challenge 2014
Compilers and Parsers, Chef-jumping, Stone
July Challenge 2015
Bread, Na2a and lucky stone
September Challenge 2017
Little Chef and Sums, Fill The Matrix, Minimum Good Permutation, Chef and Pick Digit, Sereja and Commands
October Challenge 2017
Chef and a great voluntary Program, Chef and Cycled Cycles, Max Mex, Counter Test For CHEFSUM, A Balanced Contest
November Challenge 2017
Chef goes Left Right Left, Periodic Palindrome Construction, Villages and Tribes
December Challenge 2017
Chef and Hamming Distance of arrays, Penalty Shoot-out, Total Diamonds, Chef And his Cake
January Challenge 2018
K-Concatenation, Maximum Score, Rectangle, String Merging, Partition the numbers
February Challenge 2018
(Challenge) Biased Committee, Permutation and Palindrome, Car-pal Tunnel, Points Inside A Polygon, Chef And The Patents, Chef And His Characters, Broken Clock
March Challenge 2018 DIV 1
Pishty and Triangles, Chef and Easy Problem, Chef and Gcd Queries, Mix the Colors, Minions and Voting
April Challenge 2018 Division 1
Chef and Array (Challenge), Cutting Plants, Highway Crossing, Chef and Same Old Recurrence, Count Good Prefixes
Indonesia