Every single leetcode problem. (WIP)
Problems are done in go if possible, otherwise python. SQL problems are done in mysql.
Problems are grouped into folders based on the first 2 digits and named based on the problem url (e.g. problem 21 "Merge two sorted lists" is in 00/21-merge-two-sorted-lists/).
General utilities are in the util folder and are copied (and often modified) into solutions that use them.