Solve day 16 part 1

2020/day16_ticket_translation.py

@@ -0,0 +1,93 @@
+import re
+from functools import lru_cache
+from typing import List, Tuple
+
+
+def main(filename: str, expected_part_1: int = None, expected_part_2: int = None):
+    print(f"\n+ Running on {filename}")
+    with open(filename) as f:
+        blocks = f.read().strip().split("\n\n")
+
+    counter_part_1 = solve_part_1(blocks)
+
+    print(f"1. Found {counter_part_1}")
+    if expected_part_1:
+        assert expected_part_1 == counter_part_1
+
+    counter_part_2 = solve_part_2(blocks)
+    print(f"2. Found {counter_part_2}")
+    if expected_part_2:
+        assert expected_part_2 == counter_part_2
+
+
+Range = Tuple[int, int]
+Ranges = List[Range]
+
+
+def solve_part_1(blocks):
+    analyser = TicketAnalyserPart1(blocks)
+    return analyser.get_error_rate()
+
+
+class TicketAnalyserPart1:
+    def __init__(self, blocks):
+        named_ranges = blocks[0].split("\n")
+        ranges = []
+        for named_range in named_ranges:
+            ranges.extend(self.extract_ranges(named_range))
+        self.ranges = self.merge_ranges(ranges)
+        self.nearby_tickets = blocks[2].split("\n")[1:]
+
+    @staticmethod
+    def extract_ranges(named_range: str) -> Ranges:
+        reg = re.compile(r"^.*: (\d+)-(\d+) or (\d+)-(\d+)$")
+        matches = reg.match(named_range)
+        groups = [int(group) for group in matches.groups()]
+        return [(groups[0], groups[1]), (groups[2], groups[3])]
+
+    @staticmethod
+    def merge_ranges(times) -> Ranges:
+        ranges = []
+        saved = list(times[0])
+        for st, en in sorted([sorted(t) for t in times]):
+            if st <= saved[1]:
+                saved[1] = max(saved[1], en)
+            else:
+                ranges.append(tuple(saved))
+                saved[0] = st
+                saved[1] = en
+        ranges.append(tuple(saved))
+        return ranges
+
+    def get_error_rate(self):
+        error_rate = 0
+        for ticket in self.nearby_tickets:
+            error_rate += sum(self.get_invalid_values(ticket))
+        return error_rate
+
+    def get_invalid_values(self, ticket: str) -> List[int]:
+        ticket = map(int, ticket.split(","))
+        invalid_values = []
+        for value in ticket:
+            if self.value_is_invalid(value):
+                invalid_values.append(value)
+        return invalid_values
+
+    @lru_cache(None)
+    def value_is_invalid(self, value: int) -> bool:
+        return not self.value_is_valid(value)
+
+    def value_is_valid(self, value: int) -> bool:
+        for rng in self.ranges:
+            if value in range(rng[0], rng[1] + 1):
+                return True
+        return False
+
+
+def solve_part_2(blocks):
+    return 0
+
+
+if __name__ == "__main__":
+    main("inputs/day16-test1", 71)
+    main("inputs/day16", 32835)

2020/inputs/day16

@@ -0,0 +1,269 @@
+departure location: 30-260 or 284-950
+departure station: 29-856 or 863-974
+departure platform: 32-600 or 611-967
+departure track: 44-452 or 473-965
+departure date: 36-115 or 129-950
+departure time: 50-766 or 776-972
+arrival location: 40-90 or 104-961
+arrival station: 40-864 or 887-971
+arrival platform: 32-920 or 932-964
+arrival track: 45-416 or 427-959
+class: 47-536 or 557-964
+duration: 33-229 or 246-969
+price: 25-147 or 172-969
+route: 32-328 or 349-970
+row: 50-692 or 709-964
+seat: 49-292 or 307-964
+train: 28-726 or 748-954
+type: 37-430 or 438-950
+wagon: 46-628 or 638-973
+zone: 39-786 or 807-969
+
+your ticket:
+89,193,59,179,191,173,61,73,181,67,71,109,53,79,83,113,107,139,131,137
+
+nearby tickets:
+499,362,657,143,723,763,935,454,473,586,372,489,214,753,765,65,307,56,853,934
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2020/inputs/day16-test1

@@ -0,0 +1,12 @@
+class: 1-3 or 5-7
+row: 6-11 or 33-44
+seat: 13-40 or 45-50
+
+your ticket:
+7,1,14
+
+nearby tickets:
+7,3,47
+40,4,50
+55,2,20
+38,6,12