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#!/usr/bin/env python3
import aoc20
import sys
def pt1(_in):
x, y = 0, 0
dirs = ((1, 0), (0, -1), (-1, 0), (0, 1))
dir = 0
for inst in _in:
action, amount = inst[0], int(inst[1:])
if action == "N":
y -= amount
elif action == "W":
x -= amount
elif action == "S":
y += amount
elif action == "E":
x += amount
elif action == "F":
x += dirs[dir][0] * amount
y += dirs[dir][1] * amount
elif action == "L":
dir = (dir + amount // 90) % 4
elif action == "R":
dir = (dir - amount // 90) % 4
return abs(x) + abs(y)
def pt2(_in):
ship_x, ship_y = 0, 0
wp_x, wp_y = 10, -1
for inst in _in:
action, amount = inst[0], int(inst[1:])
if action == "N":
wp_y -= amount
elif action == "W":
wp_x -= amount
elif action == "S":
wp_y += amount
elif action == "E":
wp_x += amount
elif action == "F":
ship_x += wp_x * amount
ship_y += wp_y * amount
elif action == "L":
for _ in range((amount//90) % 4):
wp_x, wp_y = wp_y, -wp_x
elif action == "R":
for _ in range((amount//90) % 4):
wp_x, wp_y = -wp_y, wp_x
return abs(ship_x) + abs(ship_y)
if __name__ == "__main__":
input = aoc20.read_input(sys.argv[1:], 12)
print(pt1(input))
print(pt2(input))
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