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Off By One: The Musical.\n\nSo I hit on the idea of building a Djikstra implementation but based on\npaths instead of coordinates pretty quickly. Took about an hour to write\nand I was pretty proud of it... and then I spent the rest of the night\nand some of the next day plagues by off-by-one errors.\n\nFor Part 1 the issue was small. My answer was one too high for both the\ntest input and the answer. But then in Part 2, my solution worked for\nthe two test inputs bur NOT for the real input. Turns out one of my path\nlength checks was off-by-one (which has no effect on the test inputs)\nAND (one fixed) my algorithm was now spitting out the right answer, not\nthe off-by-one answer, but ONLY for the real input. 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