January Challenge 2015
Sereja and Votes, Chef and Stones
February Challenge 2015
Chef and Chain, Chef and Equality
April Challenge 2015
Chef and Interview, Broken Telephone
August Challenge 2015
Cooking Machine, Aditi and Magic Trick, Gravity Guy
September Challenge 2015
Chain of Doughnuts, Count Steps in Matrix, Bank robbery, Lighthouses, Cracking the Code
October Challenge 2015
Spheres, Who dares to be a millionaire, Time measure, Count Subarrays
August Cook-Off 2015
Chef and the XORed Number , Chef and the Wildcard Matching
March Challenge 2016
Palindromic substrings, maximize the sum
March Challenge 2017
Xenny and Alternating Tasks, Bear and Extra Number
May Challenge 2017
Chef and his daily routine, Courses in an university
February Challenge 2020 Division 2
No Change Required, The Theatre Problem, School of Geometry, Hard Cash
March Challenge 2020 Division 2
XOR Engine, Ada Bishop 2, Pintu and Fruits
India