Codingame Jon's Walkthrough

Have you ever tried Codingame?

I think it's an amazing experience of programming games and solving local programming tasks. So I decided to solve all their in-game tasks as many as I can. Perhaps, it'll be more successful than my analogical anonym walkthrough in Stackoverflow. I definitely need to train my skills of issue-solving, not just discuss or share solutions around the web. Training it for myself, without any community and interactivity is too boring for me, so I decided to share my successes and failures in this walkthrough :) )

Also, this goal helps me to improve my English writing skill practically (now it's theoretically on intermediate level, and that's actually s*cks :). I would describe my walkthrough experience in English only, if you'd like to write some comments here, it's highly recommended to do it in English! :).

If you have some ideas or suggestions about my issues on Codingame or about mistakes in my posts and comments, feel free to write about it! :)