June Challenge 2017
Persistent oak, Chef and Prime Queries, Euler Sum, A Good Set, Cloning, Chef and the Feast, Xenny and Coin Rankings, Triplets, Pairwise union of sets
July Challenge 2017
Two Coins, IPC Trainers, Calculator , Whats in the Name, Multiplication Program, Pishty and tree, Irrational Root, Chef and Sign Sequences, Tree Expectancy
August Long Challenge 2017
Greedy Candidates, Strings and Graphs, Palindromic Game, Walks on the binary tree, Hill Jumping, Chef and Mover, Chef And Fibonacci Array, Chef and Rainbow Array
January Challenge 2018
Killing Monsters, A humongous Query, Simplify the Square Root, Killjee and k-th letter , K-Concatenation, Maximum Score, Rectangle, String Merging, Partition the numbers
China