January Challenge 2018
A humongous Query, Killjee and k-th letter , K-Concatenation, Maximum Score, Rectangle, String Merging, Partition the numbers
February Challenge 2018
Chef And His Characters, Permutation and Palindrome, Car-pal Tunnel, Points Inside A Polygon, Chef and odd queries, Chef And The Patents, Broken Clock
March Challenge 2018 DIV 1
Chef and Easy Problem, Minions and Voting, Mix the Colors, Chef and Gcd Queries, Pishty and Triangles
May Challenge 2018 Division 1
S-T Mincut, Change the Signs, Fake Binary Search, Dibs on Fibs
December Lunchtime 2018 Division 1
Choosing from Buckets, Drawing Lines, Age Calculator
April Challenge 2019 Division 1
Offer for Chef, Playing with Numbers, Subtree Removal
Brazil