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-rw-r--r--12/a.rb39
-rw-r--r--12/b.rb43
-rw-r--r--12/input.txt778
3 files changed, 860 insertions, 0 deletions
diff --git a/12/a.rb b/12/a.rb
new file mode 100644
index 0000000..e47babe
--- /dev/null
+++ b/12/a.rb
@@ -0,0 +1,39 @@
+instructions = File.readlines('input.txt').map do |line|
+ [line.slice(0, 1), line.slice(1, line.length).to_i]
+end
+
+n = 0
+e = 0
+direction = 0
+
+instructions.each do |instruction|
+ case instruction[0]
+ when 'N'
+ n += instruction[1]
+ when 'S'
+ n -= instruction[1]
+ when 'E'
+ e += instruction[1]
+ when 'W'
+ e -= instruction[1]
+ when 'F'
+ case direction
+ when 0
+ e += instruction[1]
+ when 90
+ n += instruction[1]
+ when 180
+ e -= instruction[1]
+ when 270
+ n -= instruction[1]
+ end
+ when 'L'
+ direction += instruction[1]
+ direction %= 360
+ when 'R'
+ direction -= instruction[1]
+ direction %= 360
+ end
+end
+
+puts n.abs + e.abs
diff --git a/12/b.rb b/12/b.rb
new file mode 100644
index 0000000..4bd8ed0
--- /dev/null
+++ b/12/b.rb
@@ -0,0 +1,43 @@
+instructions = File.readlines('input.txt').map do |line|
+ [line.slice(0, 1), line.slice(1, line.length).to_i]
+end
+
+def rotate n, e, direction
+ case direction
+ when 0
+ [n, e]
+ when 90
+ [e, -n]
+ when 180
+ [-n, -e]
+ when 270
+ [-e, n]
+ end
+end
+
+ship_n = 0
+ship_e = 0
+waypoint_n = 1
+waypoint_e = 10
+
+instructions.each do |instruction|
+ case instruction[0]
+ when 'N'
+ waypoint_n += instruction[1]
+ when 'S'
+ waypoint_n -= instruction[1]
+ when 'E'
+ waypoint_e += instruction[1]
+ when 'W'
+ waypoint_e -= instruction[1]
+ when 'F'
+ ship_n += waypoint_n * instruction[1]
+ ship_e += waypoint_e * instruction[1]
+ when 'L'
+ waypoint_n, waypoint_e = rotate waypoint_n, waypoint_e, instruction[1]
+ when 'R'
+ waypoint_n, waypoint_e = rotate waypoint_n, waypoint_e, (-instruction[1] % 360)
+ end
+end
+
+puts ship_n.abs + ship_e.abs
diff --git a/12/input.txt b/12/input.txt
new file mode 100644
index 0000000..3231c44
--- /dev/null
+++ b/12/input.txt
@@ -0,0 +1,778 @@
+E1
+S5
+W5
+R90
+S2
+L90
+F70
+W1
+R90
+E4
+F50
+S2
+F92
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+W2
+S2
+W1
+L270
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+F77
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+F100
+L90
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+S2
+F68
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+E1
+L180
+E1
+F24
+F83
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+N5
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+R90
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+W4
+F12
+W4
+L90
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+F74
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