February Challenge 2017
Chef and His Apartment Dues, Eugene and big number
March Challenge 2017
Xenny and Alternating Tasks, Bear and Extra Number, Bandwidth of a matrix
April Challenge 2017
Bear and Row 01, Similar Dishes, Bear and Clique Distances, Dish Of Life, Stable market, Chef and Divisor Tree, Chef and Digits
May Challenge 2017
Chef and his daily routine, Courses in an university, Blocked websites, Median of adjacent maximum numbers
June Challenge 2017
Chef and Prime Queries, Pairwise union of sets, Triplets, Xenny and Coin Rankings, Chef and the Feast, A Good Set
July Challenge 2017
Chef and Sign Sequences, Pishty and tree, Tree Expectancy, Whats in the Name, Calculator , IPC Trainers, Two Coins
August Long Challenge 2017
Chef and Rainbow Array, Strings and Graphs, Greedy Candidates, Chef and Mover, Chef And Fibonacci Array, Palindromic Game
October Challenge 2017
Chef and Magic Arrays, Chef and a great voluntary Program, Chef and Cycled Cycles, Max Mex, Counter Test For CHEFSUM, A Balanced Contest
December Challenge 2017
Chef, Leonardo And Queries, Chef and Hamming Distance of arrays, Red and blue points, Penalty Shoot-out, Chef And Easy Xor Queries, Chef And his Cake, Santa Delivering Problem, Total Diamonds, Chef and Universe
July Cook-Off 2017
Chang and Bitwise OR, Chang and the Perfect Function, Chang and Perfect Quadruples
September Cook-Off 2017
Statistics Construction, Subsequence Equality
March Cook-off 2018 Division 1
Chef Goes to the Cinema, Chef Restores an Array, Chef Restores a Matrix
India