This challenge is an excellent exercise in both mathematics and programming. I appreciate the variety of solutions posted here, especially those that delve into the mathematical logic behind the problem. However, I noticed some inconsistencies in the test cases, particularly regarding the absolute value of the difference. It would be great if the challenge could clarify this aspect. Overall, it's a well-structured problem that encourages critical thinking and problem-solving skills in login portal with new techniques. I highly recommend taking the time to go through them; they could offer new perspectives that you might find useful learning for this challenge and similar problems in the future.