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-rw-r--r--day12/day12.py102
-rw-r--r--day12/input770
2 files changed, 872 insertions, 0 deletions
diff --git a/day12/day12.py b/day12/day12.py
new file mode 100644
index 0000000..2476725
--- /dev/null
+++ b/day12/day12.py
@@ -0,0 +1,102 @@
+"""Day 12."""
+import math
+
+with open("input") as f:
+ instructions = f.read().rstrip().split("\n")
+
+DIRECTIONS = ("N", "E", "S", "W")
+CURRENT_DIRECTION = "E"
+CORDS = {
+ "x": 0,
+ "y": 0,
+}
+WAYPOINT = {
+ 'x': 10,
+ 'y': 1,
+}
+
+
+def left(current_direction, degree):
+ idx = DIRECTIONS.index(current_direction) - (degree // 90)
+ return DIRECTIONS[idx % len(DIRECTIONS)]
+
+
+def right(current_direction, degree):
+ idx = DIRECTIONS.index(current_direction) + (degree // 90)
+ return DIRECTIONS[idx % len(DIRECTIONS)]
+
+
+def update_coords(direction, value):
+ if direction == "N":
+ CORDS["y"] += value
+ if direction == "E":
+ CORDS["x"] += value
+ if direction == "S":
+ CORDS["y"] -= value
+ if direction == "W":
+ CORDS["x"] -= value
+
+
+for inst in instructions:
+ direction, value = inst[0], int(inst[1:])
+ if direction == "L":
+ CURRENT_DIRECTION = left(CURRENT_DIRECTION, value)
+ elif direction == "R":
+ CURRENT_DIRECTION = right(CURRENT_DIRECTION, value)
+ elif direction == "F":
+ update_coords(CURRENT_DIRECTION, value)
+ else:
+ update_coords(direction, value)
+
+# Part 1
+part_1 = abs(CORDS["x"]) + abs(CORDS["y"])
+print(part_1)
+assert part_1 == 882
+
+# reset coords
+CORDS = {
+ "x": 0,
+ "y": 0,
+}
+
+def update_waypoint(direction, value):
+ if direction == "N":
+ WAYPOINT["y"] += value
+ if direction == "E":
+ WAYPOINT["x"] += value
+ if direction == "S":
+ WAYPOINT["y"] -= value
+ if direction == "W":
+ WAYPOINT["x"] -= value
+
+
+def clockwise(degrees):
+ """rotate clockwise."""
+ x = WAYPOINT["x"]
+ y = WAYPOINT["y"]
+ rads = math.radians(degrees % 360)
+ return (
+ round(x * math.cos(rads) + y * math.sin(rads)),
+ round(-x * math.sin(rads) + y * math.cos(rads))
+ )
+
+for inst in instructions:
+ direction, value = inst[0], int(inst[1:])
+ if direction == "L":
+ newx, newy = clockwise(360 - value)
+ WAYPOINT["x"] = newx
+ WAYPOINT["y"] = newy
+ elif direction == "R":
+ newx, newy = clockwise(value)
+ WAYPOINT["x"] = newx
+ WAYPOINT["y"] = newy
+ elif direction == "F":
+ CORDS["x"] += WAYPOINT["x"] * value
+ CORDS["y"] += WAYPOINT["y"] * value
+ else:
+ update_waypoint(direction, value)
+
+
+part_2 = abs(CORDS["x"]) + abs(CORDS["y"])
+assert part_2 == 28885
+print(part_2)
diff --git a/day12/input b/day12/input
new file mode 100644
index 0000000..c64cbfd
--- /dev/null
+++ b/day12/input
@@ -0,0 +1,770 @@
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