May Challenge 2017
Chef and his daily routine, Courses in an university, Median of adjacent maximum numbers
June Challenge 2017
A Good Set, Chef and the Feast, Xenny and Coin Rankings
July Challenge 2017
Chef and Sign Sequences, Whats in the Name, Calculator , IPC Trainers
August Long Challenge 2017
Chef and Rainbow Array, Greedy Candidates, Palindromic Game, Chef and Mover
September Challenge 2017
Sereja and Commands, Chef and Pick Digit, Minimum Good Permutation, Fill The Matrix, Little Chef and Sums
October Challenge 2017
(Challenge) Connecting computers, Chef and Cycled Cycles, A Balanced Contest, Max Mex, Chef and a great voluntary Program, Counter Test For CHEFSUM
July Cook-Off 2017
Chang and Bitwise OR, Chang and the Perfect Function
August Cook-Off 2017
Real obtuse, From heaven to earth
January Challenge 2018
K-Concatenation, Maximum Score, Rectangle, String Merging, Partition the numbers
August Lunchtime 2018 Division 1
Chef and Eid, Mix Mix Game
ProCon 2018 (Rated for all)
The Great Run, Kill them with your success
India