thats clever. gj wp gg

You learn by doing.... you found a way to do it! Give yourself some credit.

I FEEL SO STUPID RN

I feel so stupid after seeing this.

After reading Clean Code... Yes, you are right! :)

In my opinion, the method shouldn't be affecting the input array. In clean code this is known as a side effect that might damage the program causing temporal couplings. I don't think it makes much sense having two arrays containing the result, the one passed as an argument and the one returned by the function.

I suppose the method must not impact on the original array.

Really? The tests should check that the solution doesn't mess with the input array.