82 lines
1.7 KiB
Python
82 lines
1.7 KiB
Python
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#!/usr/bin/env python
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# 2022 - Advent Of Code 9 part2
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import math
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# file = 'input_example.txt'
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# file = 'input_example2.txt'
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file = 'input.txt'
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visited_pos = [[0, 0]]
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def parse_file(input_file):
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moves = []
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with open(input_file, encoding="utf-8") as f:
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for line in f.readlines():
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d, u = line.strip().split(' ')
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moves.append((d, int(u)))
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return moves
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def col_round(x):
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frac = x - int(x)
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if frac < 0.5:
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return math.floor(x)
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return math.ceil(x)
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def move_tail(h, t, i):
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vx = h[0] - t[0]
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vy = h[1] - t[1]
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vlen = round(math.sqrt(vx * vx + vy * vy))
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head_tail_dist = vlen
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if head_tail_dist > 1:
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nx = col_round(vx / vlen)
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ny = col_round(vy / vlen)
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t[0] += nx
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t[1] += ny
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if i == 9:
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v_list = [t[0], t[1]]
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if v_list not in visited_pos:
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visited_pos.append(v_list)
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def move_rope(r):
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for i in range(1, 10):
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move_tail(r[i-1], r[i], i)
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head_moves = parse_file(file)
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print(head_moves)
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rope = [[0, 0] for _ in range(0, 10)]
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for m in head_moves:
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if m[0] == 'R':
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print(f'right: {m[1]}')
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for _ in range(0, m[1]):
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rope[0][0] += 1
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move_rope(rope)
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if m[0] == 'L':
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print(f'left: {m[1]}')
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for _ in range(0, m[1]):
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rope[0][0] -= 1
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move_rope(rope)
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if m[0] == 'U':
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print(f'up: {m[1]}')
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for _ in range(0, m[1]):
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rope[0][1] += 1
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move_rope(rope)
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if m[0] == 'D':
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print(f'down: {m[1]}')
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for _ in range(0, m[1]):
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rope[0][1] -= 1
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move_rope(rope)
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print(visited_pos)
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print(len(visited_pos))
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