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2022/day09.py

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2022-12-24 14:59:27 +00:00
import fileinput
tx, ty, hx, hy = 0, 0, 0, 0
tail_positions = set()
for line in fileinput.input():
dir_, steps = line.split()
dx, dy = 0, 0
match dir_:
case "U":
dx, dy = 0, 1
case "D":
dx, dy = 0, -1
case "L":
dx, dy = -1, 0
case "R":
dx, dy = 1, 0
case _:
assert False
for _ in range(int(steps)):
hx_, hy_ = hx, hy
hx += dx
hy += dy
if abs(tx - hx) > 1 or abs(ty - hy) > 1:
tx = hx_
ty = hy_
# for y in range(6, -1, -1):
# for x in range(6):
# if (x, y) == (hx, hy):
# print("H", end="")
# elif (x, y) == (tx, ty):
# print("T", end="")
# elif (x, y) == (0, 0):
# print("s", end="")
# else:
# print(".", end="")
# print()
# print()
tail_positions.add((tx, ty))
print("========")
print(len(tail_positions))
for y in range(10, -1, -1):
for x in range(20):
if (x, y) == (0, 0):
print("s", end="")
elif (x, y) in tail_positions:
print("#", end="")
else:
print(".", end="")
print()