September Challenge 2014
Factorisation, Chef and Rainbow Array - 2, Fun with Rotation
October Challenge 2014
Chef and Ground, Magical Girl and Colored Liquid Potions
November Challenge 2014
Chef and Segment Game, Distinct Characters Subsequence, Let us construct palindrome, The Spelling Problem
January Challenge 2015
Sereja and Number Division 2, Chef and Stones, Sereja and Votes, One Dimensional Kingdoms, Gcd Queries
February Challenge 2015
Chef and Chain, Chef and Equality, Let us play with rank list
April Challenge 2015
Chef and Interview, Broken Telephone, Chef and Piano Scales
July Challenge 2015
Bread, Na2a and lucky stone, Chef and Cube
August Cook-Off 2015
Chef and the Wildcard Matching
March Challenge 2017
Xenny and Alternating Tasks, Bear and Extra Number
May Challenge 2017
Chef and his daily routine, Courses in an university
India