day 8

Author: bseverac

2022/day8/data.txt

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2022/day8/data_ex.txt

@@ -0,0 +1,5 @@
+30373
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+35390

2022/day8/main.rb

@@ -0,0 +1,95 @@
+#!/usr/bin/env ruby
+arr = File.readlines("data.txt")
+
+def or_operation(arr1, arr2)
+ arr1.map.with_index { |e, i| e || arr2[i] }
+end
+
+def visible_trees(arr)
+ current_max_height = -1
+ visibility = []
+ arr.map do |e|
+ visible = e > current_max_height
+ current_max_height = e if e > current_max_height
+ visible
+ end
+end
+
+class Grid
+ def initialize(arr)
+ @grid = arr.map(&:strip).map { |e| e.split("").map { |c| c.to_i } }
+ @visibility_grid = @grid.map { |row| row.map { false } }
+ @scenic_score_grid = @grid.map { |row| row.map { 0 } }
+ visibility_grid
+ scenic_score_grid
+ end
+
+ def visibility_grid
+ current_max_height = 0
+ @grid.each_with_index do |row, i|
+ @visibility_grid[i] = or_operation(@visibility_grid[i], visible_trees(row))
+ @visibility_grid[i] = or_operation(@visibility_grid[i], visible_trees(row.reverse).reverse)
+ end
+ @visibility_grid = @visibility_grid.transpose
+ @grid.transpose.each_with_index do |row, i|
+ @visibility_grid[i] = or_operation(@visibility_grid[i], visible_trees(row))
+ @visibility_grid[i] = or_operation(@visibility_grid[i], visible_trees(row.reverse).reverse)
+ end
+ @visibility_grid = @visibility_grid.transpose
+ @grid.transpose
+ end
+
+ def scenic_score_grid
+ @grid.each_with_index do |row, i|
+ row.each_with_index do |_, j|
+ @scenic_score_grid[i][j] = scenic_score(i, j)
+ end
+ end
+ end
+
+ def scenic_score(i, j)
+ scenic_score_on(i, j, 1, 0) *
+ scenic_score_on(i, j, -1, 0) *
+ scenic_score_on(i, j, 0, 1) *
+ scenic_score_on(i, j, 0, -1)
+ end
+
+ def scenic_score_on(i, j, dir_x, dir_y)
+ height = @grid[i][j]
+ score = 0
+ loop do
+ i = i + dir_x
+ j = j + dir_y
+ break unless i >= 0 && j >= 0 && @grid[i] && @grid[i][j]
+ score += 1
+ break if @grid[i][j] >= height
+ end
+ score
+ end
+
+ def display_visibility
+ @visibility_grid.each { |e| puts e.map { |e| e ? "#" : "." }.join("") }
+ end
+
+ def num_of_visible_trees
+ @visibility_grid.sum { |e| e.count(true) }
+ end
+
+ def display_scenic_score
+ @scenic_score_grid.each { |e| puts e.join(" ") }
+ end
+
+ def max_scenic_score
+ @scenic_score_grid.flatten.max
+ end
+end
+
+grid = Grid.new(arr)
+
+#star 1
+grid.display_visibility
+puts grid.num_of_visible_trees
+
+#star 2
+grid.display_scenic_score
+puts grid.max_scenic_score