April Challenge 2014
Counting Matrices, Shortest Path in Binary Trees, Farmer Feb, Chef and Digits
September Challenge 2014
Factorisation, Chef and Rainbow Array - 2, Chef and Left-Right, Fun with Rotation
October Challenge 2014
DevuLand, Dinosaurs and Laddus, Magical Girl and Colored Liquid Potions, Chef and Ground, Remy paints the fence
November Challenge 2014
Chef and Segment Game, Distinct Characters Subsequence, Chef and Red Black Tree, Let us construct palindrome
December Challenge 2014
XOR with Subset, Chef and Apple Trees
January Challenge 2015
Gcd Queries, Sereja and Votes, Chef and Stones
February Challenge 2015
Chef and Chain, Chef and Strange Formula, Chef and Strings, Let us play with rank list, Chef and Equality
April Challenge 2016
Chef and Ballons, Chef And Coloring, Chef And Magical Path, Devu and good strings, Fibonacci Queries, Help Watson Escape
March Challenge 2017
Xenny and Alternating Tasks, Bear and Extra Number, (CH) Bear and Sorted Rows, Bandwidth of a matrix
December Challenge 2018 Division 2
Chef and Interactive Contests, Chef and An Ideal Problem
Russia