60 lines
2.0 KiB
Plaintext
60 lines
2.0 KiB
Plaintext
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Advent of Code
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--- Day 3: Squares With Three Sides ---
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Now that you can think clearly, you move deeper into the labyrinth of hallways and office
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furniture that makes up this part of Easter Bunny HQ. This must be a graphic design
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department; the walls are covered in specifications for triangles.
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Or are they?
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The design document gives the side lengths of each triangle it describes, but... 5 10 25? Some
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of these aren't triangles. You can't help but mark the impossible ones.
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In a valid triangle, the sum of any two sides must be larger than the remaining side. For
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example, the "triangle" given above is impossible, because 5 + 10 is not larger than 25.
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In your puzzle input, how many of the listed triangles are possible?
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Your puzzle answer was 869.
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The first half of this puzzle is complete! It provides one gold star: *
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--- Part Two ---
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Now that you've helpfully marked up their design documents, it occurs to you that triangles
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are specified in groups of three vertically. Each set of three numbers in a column specifies a
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triangle. Rows are unrelated.
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For example, given the following specification, numbers with the same hundreds digit would be
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part of the same triangle:
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101 301 501
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102 302 502
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103 303 503
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201 401 601
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202 402 602
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203 403 603
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In your puzzle input, and instead reading by columns, how many of the listed triangles are
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possible?
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Although it hasn't changed, you can still get your puzzle input.
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References
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Visible links
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. http://adventofcode.com/
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. http://adventofcode.com/2016/about
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. http://adventofcode.com/2016/support
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. http://adventofcode.com/2016/events
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. http://adventofcode.com/2016/settings
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. http://adventofcode.com/2016/auth/logout
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. http://adventofcode.com/2016
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. http://adventofcode.com/2016
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. http://adventofcode.com/2016/leaderboard
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. http://adventofcode.com/2016/stats
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. http://adventofcode.com/2016/sponsors
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. http://adventofcode.com/2016/sponsors
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. http://adventofcode.com/2016/day/3/input
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