• No, retired katas can't be deleted, just leave it.

  • OK I know the problem. I unfortunately evaluated Codewarriors solution before mine in the two last random tests... nobody is perfect:-(
    I changed the evaluation order of my reference solution and Codewarrior's solution so everything should be fine now without having to copy the input. Could you give it a try with your modifying the input? (It is generally considered "bad practice" to modify the input:-)
    Thanks for your post!

  • But the tests already expect 0 for it. What language are you using?