added code to solve part 2

day12/input

@@ -0,0 +1,780 @@
+S1
+R270
+S5
+W2
+F63
+S3
+L90
+W4
+F59
+S1
+F21
+W4
+R90
+W1
+R180
+S2
+W2
+F91
+W5
+R270
+F97
+R90
+E2
+R90
+F6
+W1
+R90
+W3
+F1
+S4
+F1
+N3
+F76
+S4
+W5
+F88
+W4
+N3
+W2
+F48
+N1
+F50
+E3
+F18
+L90
+F30
+S3
+R90
+W1
+N5
+W1
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+R90
+E1
+S2
+F73
+R90
+S4
+F89
+F34
+L90
+F11
+S3
+F20
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+E3
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+F21
+E2
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+F41
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+W3
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+L90
+F35
+S5
+E2
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+E3
+F81
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+N3
+F28
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+F59
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+N3
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+F59
+E4
+F1
+N5
+R180
+S5
+L180
+F38
+E4
+N3
+R180
+N1
+W4
+R90
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+S3
+R90
+F71
+L90
+E5
+N4
+R90
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+F3
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+F11
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+E3
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+F85
+W4
+F53
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+W5
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+E5
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+F6
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+F50
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+F69
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+F31
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+F24
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+S3
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+S1
+W2
+F64
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+W5
+S3
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+S5
+E5
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+E1
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+N5
+F3
+W3
+F57
+R180
+E3
+F94
+W1
+F54
+W4
+S2
+W2
+N1
+L90
+W5
+S4
+L180
+L90
+F100
+E3
+R90
+N5
+E1
+R90
+E5
+L90
+S5
+L90
+S1
+R90
+E4
+S1
+W4
+F65
+R90
+N3
+W5
+F64
+R90
+E5
+R180
+W5
+F28
+S5
+L180
+S5
+R90
+E4
+F82

day12/input.sample

@@ -0,0 +1,5 @@
+F10
+N3
+F7
+R90
+F11

day12/solution1.rb

@@ -0,0 +1,47 @@
+#!/bin/env ruby
+require 'pry'
+
+def turn_ship (direction, degree, facing)
+    dirs = [:north, :east, :south, :west]
+    degree = degree / 90
+    degree = -degree if direction == 'L'
+    spin = dirs.find_index(facing) + degree
+    spin -= 4 if spin > 3
+    spin += 4 if spin < 0
+    return dirs[spin]
+end
+
+ship = {
+    :facing => :east,
+    :x_position => 0,
+    :y_position => 0 }
+
+directions = File.read('./input').split("\n")
+
+directions.each do |direction|
+    instruction = direction[0]
+    count = direction[1..-1].to_i
+
+    instruction = ship[:facing].to_s[0].upcase if instruction == 'F'
+    p [instruction, count]
+    case instruction
+    when 'N'
+        ship[:y_position] += count
+    when 'S'
+        ship[:y_position] -= count
+    when 'E'
+        ship[:x_position] += count
+    when 'W'
+        ship[:x_position] -= count
+    when 'R','L'
+        ship[:facing] = turn_ship(instruction, count, ship[:facing])
+    end
+    pp ship
+end
+
+manhattan = ship[:x_position].abs + ship[:y_position].abs
+
+p manhattan
+        
+
+#binding.pry

day12/solution2.rb

@@ -0,0 +1,70 @@
+#!/bin/env ruby
+require 'pry'
+
+def turn_ship (direction, degree, facing)
+    dirs = [:north, :east, :south, :west]
+    degree = degree / 90
+    degree = -degree if direction == 'L'
+    spin = dirs.find_index(facing) + degree
+    spin -= 4 if spin > 3
+    spin += 4 if spin < 0
+    return dirs[spin]
+end
+
+def rotate (direction, degree, waypoint)
+    degree = degree / 90
+    degree.times do
+        waypoint[:x_position], waypoint[:y_position] =
+            waypoint[:y_position], (waypoint[:x_position])
+
+        waypoint[:y_position] *= -1 if direction =='R'
+        waypoint[:x_position] *= -1 if direction == 'L'
+    end
+    return waypoint
+end
+
+
+ship = {
+    :facing => :east,
+    :x_position => 0,
+    :y_position => 0
+}
+
+waypoint = {
+    :x_position => 10,
+    :y_position => 1
+}
+
+directions = File.read('./input').split("\n")
+
+directions.each do |direction|
+    instruction = direction[0]
+    count = direction[1..-1].to_i
+
+    p [instruction, count]
+    case instruction
+    when 'F'
+        count.times do
+            ship[:x_position] += waypoint[:x_position]
+            ship[:y_position] += waypoint[:y_position]
+        end
+    when 'N'
+        waypoint[:y_position] += count
+    when 'S'
+        waypoint[:y_position] -= count
+    when 'E'
+        waypoint[:x_position] += count
+    when 'W'
+        waypoint[:x_position] -= count
+    when 'R','L'
+        waypoint = rotate(instruction, count, waypoint)
+    end
+    pp ship
+end
+
+manhattan = ship[:x_position].abs + ship[:y_position].abs
+
+p manhattan
+        
+
+#binding.pry

day15/input

@@ -0,0 +1 @@
+14,1,17,0,3,20

day15/input.sample

@@ -0,0 +1 @@
+0,3,6

day15/solution.rb

@@ -0,0 +1,20 @@
+#!/bin/env ruby
+require 'pry'
+numbers = File.read('./input').split(',')
+numbers.map!(&:to_i)
+
+runs = 30000000
+
+runs.times do |i|
+    next if i < numbers.size
+    num = numbers[-1]
+    prev_turn = numbers[..-2].reverse.find_index(num)
+    if prev_turn == nil
+        numbers.push(0)
+    else
+        new_num = (i - 1) - (numbers.size - 2 - prev_turn)
+        numbers.push(new_num)
+    end
+end
+
+puts numbers[-1]