OMG bro,you show me a new method to play this!That's so interesting!

Wow, You have just shown me that simple task can have awesome and unobvious solutions :)

I had heard that foldr can work with infinite lists, but I think this is the first time I've seen a practical application for that (as in it doesn't have to traverse the entire string to start comparing it to the empty one, like I initially thought).

Awesome, it is basically a stack.

Я совсем забыл про XOR. Спасибо за лучшее решение!

Hi @steffan153, I'm a beginner in java and I've never seen "<<", could you explain ? The mentioned doc didn't enlighten me a lot... Thanks :)

Bit shift is awesome. Nice job

That's a bitwise operator - the left bit shift.

What kind of magic is this?

most elegant solution

That is elegant.

^ is the bitwise XOR operator.

https://en.wikipedia.org/wiki/Exclusive_or