I totally agree. There is also another kata which suffers from this: Matrix Determinant (4 kyu).

Nice kata. Took me too long to solve but I need to make my solution more performanant instead of copying arrays.

nice

????

looks like we have a winner!
;)

Not a kata issue. Your solution is incorrect.

try to debug it using print, and see what happened to the list when you iterate and remove something from it.

Use code formatting when posting blocks of code.

I think this question is too easy for a 5 kyu. Perhaps a 7 kyu.

Thank you for this kata! Really enjoyed it! Gave myself an extra challenge for doing it in C.