I spent so much time debugging the instruction 4 while the error was on 203. My inner voice was going like that “yeah, the implementation of the instruction 4 seems right. OK, read the problem statement again. Wait, the implementation is right! No, you are missing something. Read the problem statement again …” hours later I figured I was looking to the wrong instruction. Hahaha

I have this moment too. For Day 7 part 2, I wrote a unit test that expects the permutation (9 8 7 6 6) to evaluate to some values, but it actually should be (9 8 7 6 5). So my code has been correct all along. It’s just that I wrote tests incorrectly, and wasted so much time on this…