Advent of Code

--- Day 3: Squares With Three Sides ---

   Now that you can think clearly, you move deeper into the labyrinth of hallways and office
   furniture that makes up this part of Easter Bunny HQ. This must be a graphic design
   department; the walls are covered in specifications for triangles.

   Or are they?

   The design document gives the side lengths of each triangle it describes, but... 5 10 25? Some
   of these aren't triangles. You can't help but mark the impossible ones.

   In a valid triangle, the sum of any two sides must be larger than the remaining side. For
   example, the "triangle" given above is impossible, because 5 + 10 is not larger than 25.

   In your puzzle input, how many of the listed triangles are possible?

   Your puzzle answer was 869.

   The first half of this puzzle is complete! It provides one gold star: *

--- Part Two ---

   Now that you've helpfully marked up their design documents, it occurs to you that triangles
   are specified in groups of three vertically. Each set of three numbers in a column specifies a
   triangle. Rows are unrelated.

   For example, given the following specification, numbers with the same hundreds digit would be
   part of the same triangle:

 101 301 501
 102 302 502
 103 303 503
 201 401 601
 202 402 602
 203 403 603

   In your puzzle input, and instead reading by columns, how many of the listed triangles are
   possible?

   Although it hasn't changed, you can still get your puzzle input.

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