From d9318b5f624e3d6cf7c18ce2aebae2c7766453f9 Mon Sep 17 00:00:00 2001
From: Luke Hubmayer-Werner <mongoose41@gmail.com>
Date: Sat, 12 Dec 2020 16:28:07 +1030
Subject: [PATCH] 2020 day 12

---
 2020/day12.py |  61 ++++
 2020/input12  | 785 ++++++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 846 insertions(+)
 create mode 100644 2020/day12.py
 create mode 100644 2020/input12

diff --git a/2020/day12.py b/2020/day12.py
new file mode 100644
index 0000000..000f5b8
--- /dev/null
+++ b/2020/day12.py
@@ -0,0 +1,61 @@
+import numpy as np
+with open('input12', 'r') as file:
+  input = [line.strip() for line in file.readlines()]
+
+directions = np.array([[1, 0], [0, 1], [-1, 0], [0, -1]])
+
+position = np.array([0,0])
+direction = 0
+
+def move_dir(direction, x):
+  global position, directions
+  position += x*directions[direction]
+
+def rotate(degrees):
+  global direction
+  direction = (direction + degrees//90)%4
+
+moves = {
+  'F': lambda x: move_dir(direction, x),
+  'E': lambda x: move_dir(0, x),
+  'N': lambda x: move_dir(1, x),
+  'W': lambda x: move_dir(2, x),
+  'S': lambda x: move_dir(3, x),
+  'L': lambda x: rotate(x),
+  'R': lambda x: rotate(-x),
+}
+
+# position = np.array([0,0])
+for line in input:
+  moves[line[0]](int(line[1:]))
+print(f'Part 1: {position} - manhattan distance = {sum(abs(position))}')
+
+
+waypoint = np.array([10, 1])
+position = np.array([0,0])
+
+def move_waypoint(direction, x):
+  global waypoint
+  waypoint += x*directions[direction]
+
+def rotate_waypoint(degrees):
+  global waypoint
+  waypoint = np.ravel(waypoint * pow(np.mat([[0, 1],[-1, 0]]), (degrees//90)%4))
+
+def move_to_waypoint(x):
+  global position
+  position += waypoint * x
+
+moves_wp = {
+  'F': lambda x: move_to_waypoint(x),
+  'E': lambda x: move_waypoint(0, x),
+  'N': lambda x: move_waypoint(1, x),
+  'W': lambda x: move_waypoint(2, x),
+  'S': lambda x: move_waypoint(3, x),
+  'L': lambda x: rotate_waypoint(x),
+  'R': lambda x: rotate_waypoint(-x),
+}
+
+for line in input:
+  moves_wp[line[0]](int(line[1:]))
+print(f'Part 2: {position} - manhattan distance = {sum(abs(position))}')
diff --git a/2020/input12 b/2020/input12
new file mode 100644
index 0000000..33221b0
--- /dev/null
+++ b/2020/input12
@@ -0,0 +1,785 @@
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