From 582367707f370678073931c67349474b8b1d5fdd Mon Sep 17 00:00:00 2001
From: Nat Lasseter <user@4574.co.uk>
Date: Wed, 14 Dec 2022 20:59:36 +0000
Subject: Day14, part2 exceptionally slow.

---
 day14/input    | 151 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 day14/part1.rb |  68 ++++++++++++++++++++++++++
 day14/part2.rb |  65 +++++++++++++++++++++++++
 day14/test     |   2 +
 4 files changed, 286 insertions(+)
 create mode 100644 day14/input
 create mode 100644 day14/part1.rb
 create mode 100644 day14/part2.rb
 create mode 100644 day14/test

(limited to 'day14')

diff --git a/day14/input b/day14/input
new file mode 100644
index 0000000..c91a439
--- /dev/null
+++ b/day14/input
@@ -0,0 +1,151 @@
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+492,26 -> 492,17 -> 492,26 -> 494,26 -> 494,16 -> 494,26 -> 496,26 -> 496,22 -> 496,26 -> 498,26 -> 498,17 -> 498,26 -> 500,26 -> 500,20 -> 500,26 -> 502,26 -> 502,25 -> 502,26 -> 504,26 -> 504,23 -> 504,26 -> 506,26 -> 506,21 -> 506,26 -> 508,26 -> 508,16 -> 508,26 -> 510,26 -> 510,24 -> 510,26
+484,44 -> 489,44
+484,39 -> 484,38 -> 484,39 -> 486,39 -> 486,33 -> 486,39 -> 488,39 -> 488,30 -> 488,39 -> 490,39 -> 490,35 -> 490,39 -> 492,39 -> 492,38 -> 492,39 -> 494,39 -> 494,30 -> 494,39 -> 496,39 -> 496,36 -> 496,39
+484,39 -> 484,38 -> 484,39 -> 486,39 -> 486,33 -> 486,39 -> 488,39 -> 488,30 -> 488,39 -> 490,39 -> 490,35 -> 490,39 -> 492,39 -> 492,38 -> 492,39 -> 494,39 -> 494,30 -> 494,39 -> 496,39 -> 496,36 -> 496,39
+489,115 -> 489,119 -> 481,119 -> 481,126 -> 494,126 -> 494,119 -> 493,119 -> 493,115
+481,92 -> 481,96 -> 476,96 -> 476,99 -> 487,99 -> 487,96 -> 485,96 -> 485,92
+492,26 -> 492,17 -> 492,26 -> 494,26 -> 494,16 -> 494,26 -> 496,26 -> 496,22 -> 496,26 -> 498,26 -> 498,17 -> 498,26 -> 500,26 -> 500,20 -> 500,26 -> 502,26 -> 502,25 -> 502,26 -> 504,26 -> 504,23 -> 504,26 -> 506,26 -> 506,21 -> 506,26 -> 508,26 -> 508,16 -> 508,26 -> 510,26 -> 510,24 -> 510,26
+492,26 -> 492,17 -> 492,26 -> 494,26 -> 494,16 -> 494,26 -> 496,26 -> 496,22 -> 496,26 -> 498,26 -> 498,17 -> 498,26 -> 500,26 -> 500,20 -> 500,26 -> 502,26 -> 502,25 -> 502,26 -> 504,26 -> 504,23 -> 504,26 -> 506,26 -> 506,21 -> 506,26 -> 508,26 -> 508,16 -> 508,26 -> 510,26 -> 510,24 -> 510,26
+489,115 -> 489,119 -> 481,119 -> 481,126 -> 494,126 -> 494,119 -> 493,119 -> 493,115
+492,153 -> 496,153
+502,150 -> 507,150
+470,49 -> 470,53 -> 468,53 -> 468,60 -> 477,60 -> 477,53 -> 476,53 -> 476,49
+475,88 -> 475,89 -> 483,89 -> 483,88
+480,134 -> 480,135 -> 500,135 -> 500,134
+470,76 -> 470,80 -> 466,80 -> 466,84 -> 481,84 -> 481,80 -> 474,80 -> 474,76
+492,26 -> 492,17 -> 492,26 -> 494,26 -> 494,16 -> 494,26 -> 496,26 -> 496,22 -> 496,26 -> 498,26 -> 498,17 -> 498,26 -> 500,26 -> 500,20 -> 500,26 -> 502,26 -> 502,25 -> 502,26 -> 504,26 -> 504,23 -> 504,26 -> 506,26 -> 506,21 -> 506,26 -> 508,26 -> 508,16 -> 508,26 -> 510,26 -> 510,24 -> 510,26
+480,166 -> 484,166
+470,49 -> 470,53 -> 468,53 -> 468,60 -> 477,60 -> 477,53 -> 476,53 -> 476,49
+470,76 -> 470,80 -> 466,80 -> 466,84 -> 481,84 -> 481,80 -> 474,80 -> 474,76
+485,112 -> 485,102 -> 485,112 -> 487,112 -> 487,111 -> 487,112 -> 489,112 -> 489,105 -> 489,112
+470,49 -> 470,53 -> 468,53 -> 468,60 -> 477,60 -> 477,53 -> 476,53 -> 476,49
diff --git a/day14/part1.rb b/day14/part1.rb
new file mode 100644
index 0000000..6c2a85f
--- /dev/null
+++ b/day14/part1.rb
@@ -0,0 +1,68 @@
+solids = []
+
+$stdin.readlines.map { |line|
+  line.strip.split(' -> ').map {
+    |coord| coord.split(?,).map(&:to_i)
+  }
+}.each { |path|
+  (path.length - 1).times { |i|
+    if path[i][0] == path[i+1][0]
+      x = path[i][0]
+      y1 = path[i][1]
+      y2 = path[i+1][1]
+      if y1 > y2
+        t = y2
+        y2 = y1
+        y1 = t
+      end
+      (y1..y2).each { |y| solids << [x, y] }
+    else
+      x1 = path[i][0]
+      x2 = path[i+1][0]
+      if x1 > x2
+        t = x2
+        x2 = x1
+        x1 = t
+      end
+      y = path[i][1]
+      (x1..x2).each { |x| solids << [x, y] }
+    end
+  }
+}
+
+solids.uniq!
+
+maxy = solids.map{ |_, y| y }.max
+
+sands = 0
+loop do
+  sand = [500, 0]
+  abyss = false
+  loop do
+    if solids.include?([sand[0], sand[1] + 1])
+      if solids.include?([sand[0] - 1, sand[1] + 1])
+        if solids.include?([sand[0] + 1, sand[1] + 1])
+          break
+        else
+          sand = [sand[0] + 1, sand[1] + 1]
+        end
+      else
+        sand = [sand[0] - 1, sand[1] + 1]
+      end
+    else
+      sand = [sand[0], sand[1] + 1]
+    end
+    if sand[1] > maxy
+      abyss = true
+      break
+    end
+  end
+  if abyss
+    break
+  else
+    solids << sand
+    sands += 1
+  end
+end
+
+puts sands
diff --git a/day14/part2.rb b/day14/part2.rb
new file mode 100644
index 0000000..dd58cb4
--- /dev/null
+++ b/day14/part2.rb
@@ -0,0 +1,65 @@
+solids = []
+
+$stdin.readlines.map { |line|
+  line.strip.split(' -> ').map {
+    |coord| coord.split(?,).map(&:to_i)
+  }
+}.each { |path|
+  (path.length - 1).times { |i|
+    if path[i][0] == path[i+1][0]
+      x = path[i][0]
+      y1 = path[i][1]
+      y2 = path[i+1][1]
+      if y1 > y2
+        t = y2
+        y2 = y1
+        y1 = t
+      end
+      (y1..y2).each { |y| solids << [x, y] }
+    else
+      x1 = path[i][0]
+      x2 = path[i+1][0]
+      if x1 > x2
+        t = x2
+        x2 = x1
+        x1 = t
+      end
+      y = path[i][1]
+      (x1..x2).each { |x| solids << [x, y] }
+    end
+  }
+}
+
+solids.uniq!
+
+floor = solids.map{ |_, y| y }.max + 1
+
+sands = 0
+loop do
+  puts sands
+  sand = [500, 0]
+  loop do
+    if sand[1] == floor
+      break
+    else
+      if solids.include?([sand[0], sand[1] + 1])
+        if solids.include?([sand[0] - 1, sand[1] + 1])
+          if solids.include?([sand[0] + 1, sand[1] + 1])
+            break
+          else
+            sand = [sand[0] + 1, sand[1] + 1]
+          end
+        else
+          sand = [sand[0] - 1, sand[1] + 1]
+        end
+      else
+        sand = [sand[0], sand[1] + 1]
+      end
+    end
+  end
+  solids << sand
+  sands += 1
+  break if sand == [500, 0]
+end
+
+puts sands
diff --git a/day14/test b/day14/test
new file mode 100644
index 0000000..4e87bb5
--- /dev/null
+++ b/day14/test
@@ -0,0 +1,2 @@
+498,4 -> 498,6 -> 496,6
+503,4 -> 502,4 -> 502,9 -> 494,9
-- 
cgit v1.2.1