50 lines
1.5 KiB
Plaintext
50 lines
1.5 KiB
Plaintext
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#!/usr/bin/python3
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import re
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with open("input") as fh:
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state = "rules"
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rules = {}
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nearby = []
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for ln in fh:
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ln = ln.strip()
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if state == "rules":
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if m := re.match(r"([a-z ]+): ([0-9]+)-([0-9]+) or ([0-9]+)-([0-9]+)", ln):
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rules[m.group(1)] = ((int(m.group(2)), int(m.group(3))),
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(int(m.group(4)), int(m.group(5))))
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elif ln == "your ticket:":
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state = "your"
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elif ln == "":
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pass
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else:
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raise RuntimeError(ln)
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elif state == "your":
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if re.match(r"[0-9,]+", ln):
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my_ticket = ln.split(",")
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elif ln == "nearby tickets:":
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state = "nearby"
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elif ln == "":
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pass
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else:
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raise RuntimeError(ln)
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elif state == "nearby":
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if re.match(r"[0-9,]+", ln):
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ticket = [int(x) for x in ln.split(",")]
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nearby.append(ticket)
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elif ln == "":
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pass
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else:
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raise RuntimeError(ln)
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ticket_scanning_error_rate = 0
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for ticket in nearby:
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for num in ticket:
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ok = False
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for rule in rules.values():
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if rule[0][0] <= num <= rule[0][1] or rule[1][0] <= num <= rule[1][1]:
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ok = True
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break
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if not ok:
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ticket_scanning_error_rate += num
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print(ticket_scanning_error_rate)
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