October Challenge 2017
Counter Test For CHEFSUM, Max Mex, A Balanced Contest
December Challenge 2017
Chef and Universe, Total Diamonds, Chef And his Cake, Chef And Easy Xor Queries, Penalty Shoot-out, Red and blue points, Chef and Hamming Distance of arrays
November Lunchtime 2017
Smart Strategy, L-R queries
January Challenge 2018
Partition the numbers, String Merging, Rectangle, Maximum Score, Killjee and k-th letter , K-Concatenation, Simplify the Square Root, A humongous Query, Killing Monsters, (Challenge) Chef and Palindromes
May Challenge 2018 Division 1
S-T Mincut, Change the Signs, Edges in Spanning Trees, Not a Convex Hull (Challenge), Fake Binary Search, Dibs on Fibs
May Challenge 2019 Division 1
Ada Rooks 2, Trees and Degrees, Where to Build the Roads, Sonya and Gifts, Ada Pawns
China