May Challenge 2017
Courses in an university, Median of adjacent maximum numbers, Chef and his daily routine
June Challenge 2017
A Good Set, Chef and the Feast, Xenny and Coin Rankings, Triplets, Pairwise union of sets
July Challenge 2017
Calculator , IPC Trainers, Whats in the Name, Chef and Sign Sequences
September Challenge 2017
Chef and Pick Digit, Minimum Good Permutation, Little Chef and Sums
June Lunchtime 2017
Maximum Unique Segment, Two Numbers
January Challenge 2018
K-Concatenation, Maximum Score, Rectangle
