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Josh Creek
22 lines
922 B
Plaintext
22 lines
922 B
Plaintext
--- Part Two ---
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Unfortunately, considering only horizontal and vertical lines doesn't give you the full picture; you need to also consider diagonal lines.
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Because of the limits of the hydrothermal vent mapping system, the lines in your list will only ever be horizontal, vertical, or a diagonal line at exactly 45 degrees. In other words:
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An entry like 1,1 -> 3,3 covers points 1,1, 2,2, and 3,3.
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An entry like 9,7 -> 7,9 covers points 9,7, 8,8, and 7,9.
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Considering all lines from the above example would now produce the following diagram:
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1.1....11.
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.111...2..
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..2.1.111.
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...1.2.2..
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.112313211
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...1.2....
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..1...1...
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.1.....1..
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1.......1.
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222111....
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You still need to determine the number of points where at least two lines overlap. In the above example, this is still anywhere in the diagram with a 2 or larger - now a total of 12 points.
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Consider all of the lines. At how many points do at least two lines overlap? |