October Cook-Off 2013
Polo the Penguin and the Test, Polo the Penguin and the XOR, Polo the Penguin and the Numbers
March Cook-Off 2014
Game of Divisors, ABC-Strings, Dividing Stamps
May Cook-Off 2014
Divide the Cake, Ups and Downs
April Challenge 2014
Sereja and Permutation, Shortest Path in Binary Trees, Divide the Tangerine, Chef and Digits, Cards, bags and coins, Farmer Feb, Counting Matrices
November Challenge 2014
Chef and Segment Game, Let us construct palindrome, Chef and Red Black Tree, Distinct Characters Subsequence, Sereja and Permutations, Chef and Words
December Challenge 2014
Chef Under Pressure, Alok-nath and His Sanskars, Chef and Bracket-Pairs, XOR with Subset, Chef and Apple Trees, Sereja and GCD
January Challenge 2015
Queries on the String, Gcd Queries, Xor Queries, One Dimensional Kingdoms, Chef and Stones, Sereja and LCM, Chef and A Large Permutation, Sereja and Votes
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
May Challenge 2015
Set Difference , Chef and new recipe, Chef and Prime Divisors
March Challenge 2018 DIV 2
Chef and Easy Problem, A Big Sale, Mix the Colors, Chef and Glove, Minions and Voting, Minion Chef and Bananas
April Challenge 2018 Division 2
Weight of Numbers, Count Good Prefixes, Average of Pairs, Workers
Brazil