September Challenge 2015
Count Steps in Matrix, Chain of Doughnuts
January Long Challenge 2016
Rupsa and the Game, Churu and Balls, Chef and Time Machine, Devu and Perfume
February Challenge 2016
Chef-Detective, Rectangles of Love, Devu and a light discussion, Chef and Strange Operations
March Challenge 2016
Sereja and Two Strings 2, Palindromic substrings, maximize the sum, Chef And Special Dishes
April Challenge 2016
Help Watson Escape, Fibonacci Queries, Chef and Ballons, Devu and good strings, Chef And Magical Path, Chef And Coloring
May Challenge 2016
Chef and Balls, Laddu, Forest Gathering, Chef and Big Soccer
June Challenge 2016
Chef And The Hiring Event, Chef and Rectangle Array, Chef and Array and K, Chef And Binary Operation, Chef and Coins Game, Chef and cities, Devu and an Array
March Cook-Off 2016
Alternating subarray prefix, Dual Nim, Digital clock
February Lunchtime 2016
Chef and Socks, Chef and Tic-Tac-Toe
June Challenge 2017
Chef and Prime Queries, A Good Set, Chef and the Feast, Xenny and Coin Rankings, Triplets, Pairwise union of sets
India