My personal solutions for Cracking the Coding Interview 6th Edition by Gayle Laakmann McDowell.
Commit messages, for example "Add 10.3 (1h 40min)", reads the time taken to write the commit. This is how I track the speed of solving questions.
krystiansulinski/CrackingTheCodingInterview
My answers to the questions from the 6th edition of the book.
Java