You sensei frowns upon you because you didn't read the instructions carefully and you are violating this rule: "Also, you may not use any integer literal. Use the preprovided zero and one to denote the numbers 0 and 1 respectively."

If you post your solution and mark it as having spoiler content, I can take a look at it. Most likely you are using a function or doing something that the tests check for and that are disallowed. (Please, place the solution inside triple backticks so it formates well.)