January Challenge 2018
A humongous Query, Simplify the Square Root, Killjee and k-th letter , K-Concatenation, Maximum Score, Rectangle, String Merging, Partition the numbers, Killing Monsters
February Challenge 2018
Chef And His Characters, Chef And The Patents, Permutation and Palindrome
April Challenge 2018 Division 2
Average of Pairs, Workers, Count Good Prefixes, Weight of Numbers, Cutting Plants, Vaibhav and Ministers, Highway Crossing
May Challenge 2018 Division 1
Dibs on Fibs, Rubber Band, Fake Binary Search, Edges in Spanning Trees, Change the Signs, S-T Mincut
June Challenge 2018 Division 1
Two Flowers, Vision, Ways to Work, Archi and Tree
July Challenge 2018 Division 1
Reach Equilibrium, No Minimum No Maximum, Gears
November Challenge 2019 Division 1
Physical Exercise, From Zero to Infinity
China