July Challenge 2015
Na2a and lucky stone, Bread, Chef and Cube
August Challenge 2015
Gravity Guy, Cooking Machine
September Challenge 2015
Chain of Doughnuts, Count Steps in Matrix
January Long Challenge 2016
Rupsa and the Game, Churu and Balls, Chef and Time Machine, Devu and Perfume
March Challenge 2016
Palindromic substrings, maximize the sum, Chef And Special Dishes
April Challenge 2016
Chef and Ballons, Chef And Coloring, Chef And Magical Path, Help Watson Escape
May Challenge 2016
Chef and Balls, Forest Gathering, Chef and Big Soccer, Laddu
June Challenge 2016
Chef And The Hiring Event, Chef and Array and K, Chef And Binary Operation, Chef and Coins Game, Devu and an Array
September Challenge 2016
Dividing Machine, Chef and digits of a number, Faded Palindromes, Chef and calculation, Chef and Friends
October Challenge 2016
Chef and Keyboard, Fenwick Iterations, Chef and Three Dogs
November Challenge 2016
Count Permutations, Chef and squares, Task for Alexey
February Lunchtime 2016
Chef and Socks, Chef and Tic-Tac-Toe
February Challenge 2017
Chef and Yoda, Eugene and big number, Chef and Triangles, Chef and His Apartment Dues, Most Frequent Element, Gerrymander
March Challenge 2017
Cooking Schedule, Xenny and Alternating Tasks, Pishty and birthday, Bear and Extra Number, (CH) Bear and Sorted Rows, Bandwidth of a matrix
India