December Cook-Off 2014
Player, Good Joke!, Matrix Again
October Challenge 2014
Chef and Ground, DevuLand, Dinosaurs and Laddus
November Challenge 2014
The Spelling Problem, Chef and Churu, Let us construct palindrome, Chef and Red Black Tree, Sereja and Permutations, Fombinatorial, Chef and Words, Chef and Segment Game, Distinct Characters Subsequence
December Challenge 2014
Kali and Devtas, Sereja and GCD, Chef and Apple Trees, XOR with Subset, Chef and Bracket-Pairs, Alok-nath and His Sanskars, Chef Under Pressure
January Challenge 2015
Gcd Queries, Ranka, Xor Queries, One Dimensional Kingdoms, Sereja and Votes, Sereja and LCM, Chef and A Large Permutation, Sereja and Number Division 2, Queries on the String, Chef and Stones
February Challenge 2015
Chef and Chain, Time to Study Graphs with Chef, Chef and Strange Formula, Chef and Strings, Let us play with rank list, Chef and Equality
March Challenge 2015
Sereja and Random Array, Matrix, Devu and his Class, Chef and Problems, Chef and Notebooks, Count Substrings
April Challenge 2020 Division 1
Strange Number, Squared Subsequences, Perfect Power Divisors, Ready Bitwise, Factor Tree, Leaked Answers (Challenge)
March Cook-Off 2020 Division 1
Mysterious Sequence, Maximize Letter Beauty, Random Chocolates, Escape the Tree
March Lunchtime 2020 Division 1 (Unrated)
Maximize LCM, Strip in a Tree!
Poland