Created
December 14, 2017 15:41
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Advent of Code 2017, Day 13
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| INPUT = """0: 3 | |
| 1: 2 | |
| 2: 4 | |
| 4: 6 | |
| 6: 5 | |
| 8: 8 | |
| 10: 6 | |
| 12: 4 | |
| 14: 8 | |
| 16: 6 | |
| 18: 8 | |
| 20: 8 | |
| 22: 6 | |
| 24: 8 | |
| 26: 9 | |
| 28: 12 | |
| 30: 8 | |
| 32: 14 | |
| 34: 10 | |
| 36: 12 | |
| 38: 12 | |
| 40: 10 | |
| 42: 12 | |
| 44: 12 | |
| 46: 12 | |
| 48: 12 | |
| 50: 14 | |
| 52: 12 | |
| 54: 14 | |
| 56: 12 | |
| 60: 14 | |
| 62: 12 | |
| 64: 14 | |
| 66: 14 | |
| 68: 14 | |
| 70: 14 | |
| 72: 14 | |
| 74: 14 | |
| 78: 26 | |
| 80: 18 | |
| 82: 17 | |
| 86: 18 | |
| 88: 14 | |
| 96: 18""" | |
| TEST = """0: 3 | |
| 1: 2 | |
| 4: 4 | |
| 6: 4""" | |
| from collections import defaultdict | |
| from functools import partial | |
| def read_input(input): | |
| ports = {} | |
| for line in input.splitlines(): | |
| idx, depth = map(int, line.split(": ")) | |
| ports[idx] = depth | |
| #print ports | |
| num_ports = max(ports.keys()) | |
| return [ports.get(idx, 1) for idx in range(num_ports+1)] | |
| def _is_scanning(depth, picosecond): | |
| if depth == 1: | |
| return False | |
| else: | |
| return (picosecond % ((depth-1) * 2)) == 0 | |
| def once_through(ports, picosecond=0, stop_if_caught=False): | |
| tot_severity = 0 | |
| times_caught = 0 | |
| start_picosecond = picosecond | |
| for idx, depth in enumerate(ports): | |
| if 0: | |
| print idx, start_picosecond, picosecond | |
| print " ", " ".join("%5s" % d for d in ports) | |
| print " ", " ".join("%5s" % _is_scanning(d, picosecond) for d in ports) | |
| if _is_scanning(depth, picosecond): | |
| if stop_if_caught: | |
| if 0: | |
| print idx, start_picosecond, picosecond, "CAUGHT" | |
| print " ", " ".join("%5s" % d for d in ports) | |
| print " ", " ".join("%5s" % _is_scanning(d, picosecond) for d in ports) | |
| return 1, 0 | |
| else: | |
| tot_severity += depth * idx | |
| times_caught += 1 | |
| picosecond += 1 | |
| return times_caught, tot_severity | |
| def part_one(input): | |
| ports = read_input(input) | |
| times_caught, tot_severity = once_through(ports, picosecond=0, stop_if_caught=False) | |
| return tot_severity | |
| print part_one(TEST) | |
| print part_one(INPUT) | |
| def part_two(input): | |
| ports = read_input(input) | |
| start_picosecond = 0 | |
| while True: | |
| if not start_picosecond % 10000: | |
| print start_picosecond | |
| times_caught, tot_severity = once_through(ports, picosecond=start_picosecond, stop_if_caught=True) | |
| if times_caught == 0: | |
| return start_picosecond | |
| start_picosecond += 1 | |
| return start_picosecond | |
| print part_two(TEST) | |
| print part_two(INPUT) |
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