March Challenge 2016
maximize the sum, Palindromic substrings
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
July Challenge 2016
Andrash and Stipendium, Chef and Segments, Chef and Tetris, Chef and Robots Competition, Chefland and Electricity
October Challenge 2016
Chef and Keyboard, Fenwick Iterations
December Challenge 2016
Roses for Alexey, Kth Max Subarray, Train Partner, Kirito in labyrinth
April Lunchtime 2016
Maximum K Sums, Coins And Triangle
June Lunchtime 2016
Collisions, One more weird game
June Challenge 2017
Chef and the Feast, Pairwise union of sets, Triplets, Xenny and Coin Rankings, A Good Set, Chef and Prime Queries
July Challenge 2017
Chef and Sign Sequences, Pishty and tree, Whats in the Name, Calculator , IPC Trainers
Vietnam