2020 day 12

2020/day12.py

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+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))}')

2020/input12

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