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how long did it take to reach your rank and do you code professionally

Better love story than Twilight.

I was very surprised when I found out that most people solved it the same way I did.

WTF

same answer ;)

I swear I was expecting an answer like that...

Yup, thanks, I've just done that :) I wanted to leave a note here for the time being, in case someone reads this solution and wonders whether it's correct. I realised too late that other solutions have similar problems.

You should log an issue on the discourse page. I believe test cases should be added for this.

awesome

please explain

This is the right way to respond to challenges like these :P

Why wouldn't you use a built in method?

Did the exact same thing

What I mean, is if you get this during an interview, you probably whould need to show how it's done without the build-in methods.