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day-09.py
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# import all the utils I might use
from __future__ import annotations
from aocd import get_data
from aocd import submit
import re
from dataclasses import dataclass, field
import typing as T
from collections import defaultdict
data = get_data(day=9, year=2022)
####### part 1
# test
test_data = \
"""R 4
U 4
L 3
D 1
R 4
D 1
L 5
R 2"""
# un-comment below when ready to use real data
# data = test_data
lines = data.split('\n')
def find_diff(h, t):
return (h[0] - t[0], h[1] - t[1])
visited = set()
t = (0, 0)
h = (0, 0)
for line in lines:
d, moves = line.split(' ')
moves = int(moves)
# print(line)
for i in range(moves):
# print("h", h, "t", t)
# do a thing
if d == 'U':
h = (h[0], h[1] + 1)
if d == 'D':
h = (h[0], h[1] - 1)
if d == 'L':
h = (h[0] - 1, h[1])
if d == 'R':
h = (h[0] + 1, h[1])
diff = find_diff(h, t)
"""
x x x
x x
x o x
x x
x x x
"""
if diff == (2, 0):
t = (t[0] + 1, t[1])
elif diff == (2, 1):
t = (t[0] + 1, t[1] + 1)
elif diff == (1, 2):
t = (t[0] + 1, t[1] + 1)
elif diff == (0, 2):
t = (t[0], t[1] + 1)
elif diff == (-1, 2):
t = (t[0] - 1, t[1] + 1)
elif diff == (-2, 1):
t = (t[0] - 1, t[1] + 1)
elif diff == (-2, 0):
t = (t[0] - 1, t[1])
elif diff == (-2, -1):
t = (t[0] - 1, t[1] - 1)
elif diff == (-1, -2):
t = (t[0] - 1, t[1] - 1)
elif diff == (0, -2):
t = (t[0], t[1] - 1)
elif diff == (1, -2):
t = (t[0] + 1, t[1] - 1)
elif diff == (2, -1):
t = (t[0] + 1, t[1] - 1)
visited.add(t)
count = len(list(visited))
ans = count
print(ans)
# part 2
test_data = """R 5
U 8
L 8
D 3
R 17
D 10
L 25
U 20"""
# un-comment below when ready to use real data
# data = test_data
lines = data.split('\n')
visited = set()
rope = [(0, 0)] * 10
for line in lines:
d, moves = line.split(' ')
moves = int(moves)
# print(line)
for i in range(moves):
# move head
h = rope[0]
if d == 'U':
rope[0] = (h[0], h[1] + 1)
if d == 'D':
rope[0] = (h[0], h[1] - 1)
if d == 'L':
rope[0] = (h[0] - 1, h[1])
if d == 'R':
rope[0] = (h[0] + 1, h[1])
# print(i, rope[0])
"""
x x x x x
x x
x o x
x x
x x x x x
"""
# move the rest
for i in range(1, 10):
h = rope[i - 1]
t = rope[i]
diff = find_diff(h, t)
if diff == (2, 0):
t = (t[0] + 1, t[1])
elif diff == (2, 1):
t = (t[0] + 1, t[1] + 1)
elif diff == (1, 2):
t = (t[0] + 1, t[1] + 1)
elif diff == (0, 2):
t = (t[0], t[1] + 1)
elif diff == (-1, 2):
t = (t[0] - 1, t[1] + 1)
elif diff == (-2, 1):
t = (t[0] - 1, t[1] + 1)
elif diff == (-2, 0):
t = (t[0] - 1, t[1])
elif diff == (-2, -1):
t = (t[0] - 1, t[1] - 1)
elif diff == (-1, -2):
t = (t[0] - 1, t[1] - 1)
elif diff == (0, -2):
t = (t[0], t[1] - 1)
elif diff == (1, -2):
t = (t[0] + 1, t[1] - 1)
elif diff == (2, -1):
t = (t[0] + 1, t[1] - 1)
elif diff == (-2, -2):
t = (t[0] - 1, t[1] - 1)
elif diff == (-2, 2):
t = (t[0] - 1, t[1] + 1)
elif diff == (2, 2):
t = (t[0] + 1, t[1] + 1)
elif diff == (2, -2):
t = (t[0] + 1, t[1] - 1)
rope[i] = t
if i == 9:
visited.add(t)
# print(rope)
count = len(list(visited))
# print(rope)
ans = count
print(ans)