I stumbled upon Project Euler once more since I needed multiple solutions in different languages for a random problem. Til did show it to me like 2 years ago and since then they made these dynamic profil images. Not exactly beautiful, but I wanted to post it on my blog anyway, haha. All of the problems are itself sort of unrelated to anything, however the 10 seconds rule – which is the maximum time your program should take getting the solution – will lead you into new directions of efficient programming. You can even improve your knowledge about other programming languages while implementing the solution in more than only one language.
(here my progress on github)