Mercurial > repos > other > adventofcode2023
diff day14.rb @ 21:46fb65f2cb94
Add Day 14 part 1 implementation
If you look at columns and see "how far can this go" then the
weight is just the sum of the partial triangle numbers of
highest_weight to highest_weight minus number of rocks that
can roll up to there.
Part 2 seems to involve actually moving the rocks, though!
| author | IBBoard <dev@ibboard.co.uk> |
|---|---|
| date | Sat, 16 Dec 2023 10:29:36 +0000 |
| parents | |
| children |
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--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/day14.rb Sat Dec 16 10:29:36 2023 +0000 @@ -0,0 +1,27 @@ +#! /usr/bin/env ruby + +if ARGV.length != 1 + abort("Incorrect arguments - needs input file") +elsif not File.exist? (ARGV[0]) + abort("File #{ARGV[0]} did not exist") +end + +file = ARGV[0] + +platform = File.open(file, "r").each_line(chomp: true).map {|row| row.each_char.to_a}.to_a.transpose() + +COL_SIZE = platform[0].length + +chunked_platform = platform.map {|col| col.chunk_while {|i, j| i != "#"}.to_a} +total_load = chunked_platform.reduce(0) do |weight, col| + _, col_weight = col.reduce([COL_SIZE, 0]) do |accum, chunk| + first_obj_weight, temp_weight = accum + num_moved_objs = chunk.count("O") + last_obj_weight = first_obj_weight - num_moved_objs + temp_weight += ((first_obj_weight * (first_obj_weight + 1)) / 2) - ((last_obj_weight * (last_obj_weight + 1)) / 2) + first_obj_weight -= chunk.length + [first_obj_weight, temp_weight] + end + weight + col_weight +end +puts total_load \ No newline at end of file