day16 - raw version

day16.py

@@ -0,0 +1,117 @@
+import aoclib
+
+DAY = 16
+TEST_SOLUTION_PART1 = 71
+TEST_SOLUTION_PART2 = 7
+
+
+def part1(test_mode=False):
+    my_input = aoclib.getInputAsArray(day=DAY, test=test_mode)
+
+    restraints = {}
+    other_tickets = []
+
+    for i, line in enumerate(my_input):
+        if not line:
+            other_tickets = my_input[i+5:]
+            break
+
+        field, limits = line.split(": ")
+        limit_low, limit_hi = limits.split(" or ")
+        min_low, max_low = limit_low.split("-")
+        min_hi, max_hi = limit_hi.split("-")
+        restraints[field] = [(int(min_low), int(max_low)), (int(min_hi), int(max_hi))]
+
+    invalid_numbers = []
+    for ticket in other_tickets:
+        for number in ticket.split(","):
+            valid = False
+            number = int(number)
+            for field in restraints:
+                if restraints[field][0][0] <= number <= restraints[field][0][1] or \
+                        restraints[field][1][0] <= number <= restraints[field][1][1]:
+                    valid = True
+
+                    break
+
+            if not valid:
+                invalid_numbers.append(number)
+
+    return sum(invalid_numbers)
+
+
+def part2(test_mode=False):
+    my_input = aoclib.getInputAsArray(day=DAY, test=test_mode)
+
+    restraints = {}
+    possible_positions = {}
+    my_ticket = ''
+    other_tickets = []
+
+    for i, line in enumerate(my_input):
+        if not line:
+            my_ticket = my_input[i+2]
+            other_tickets = my_input[i+5:]
+            break
+
+        field, limits = line.split(": ")
+        limit_low, limit_hi = limits.split(" or ")
+        min_low, max_low = limit_low.split("-")
+        min_hi, max_hi = limit_hi.split("-")
+        restraints[field] = [(int(min_low), int(max_low)), (int(min_hi), int(max_hi))]
+
+    num_fields = len(my_ticket.split(','))
+    for field in restraints:
+        possible_positions[field] = [x for x in range(num_fields)]
+
+    for ticket in other_tickets:
+        invalid = False
+        for position, number in enumerate(ticket.split(",")):
+            valid = False
+            number = int(number)
+            for field in restraints:
+                if restraints[field][0][0] <= number <= restraints[field][0][1] or \
+                        restraints[field][1][0] <= number <= restraints[field][1][1]:
+                    valid = True
+
+                    break
+
+            if not valid:
+                invalid = True
+                break
+
+        if invalid:
+            continue
+
+        for position, number in enumerate(ticket.split(",")):
+            number = int(number)
+            for field in restraints:
+                if not restraints[field][0][0] <= number <= restraints[field][0][1] and \
+                        not restraints[field][1][0] <= number <= restraints[field][1][1]:
+                    possible_positions[field].remove(position)
+
+    single_possibilities = []
+    while 1:
+        all_done = True
+        for field, possibilities in possible_positions.items():
+            possible_position = possibilities[0]
+            if len(possibilities) == 1 and possible_position not in single_possibilities:
+                all_done = False
+                single_possibilities.append(possible_position)
+                for check_field in possible_positions:
+                    try:
+                        if len(possible_positions[check_field]) > 1:
+                            possible_positions[check_field].remove(possible_position)
+                    except ValueError:
+                        pass
+
+        if all_done:
+            break
+
+    answer = 1
+    my_ticket = [int(x) for x in my_ticket.split(",")]
+    for field in restraints:
+        if field.startswith('departure'):
+            answer *= my_ticket[possible_positions[field][0]]
+
+    return answer

inputs/16

@@ -0,0 +1,269 @@
+departure location: 34-269 or 286-964
+departure station: 27-584 or 609-973
+departure platform: 49-135 or 155-974
+departure track: 36-248 or 255-954
+departure date: 50-373 or 381-974
+departure time: 49-454 or 472-967
+arrival location: 33-900 or 925-968
+arrival station: 46-699 or 706-965
+arrival platform: 42-656 or 666-967
+arrival track: 49-408 or 425-950
+class: 30-626 or 651-957
+duration: 43-109 or 127-964
+price: 33-778 or 795-952
+route: 37-296 or 315-966
+row: 28-318 or 342-965
+seat: 33-189 or 208-959
+train: 49-536 or 552-968
+type: 46-749 or 772-949
+wagon: 29-386 or 401-954
+zone: 34-344 or 368-954
+
+your ticket:
+109,101,79,127,71,59,67,61,173,157,163,103,83,97,73,167,53,107,89,131
+
+nearby tickets:
+994,873,258,172,884,554,258,712,264,183,728,255,824,54,740,838,614,850,881,873
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inputs/16_test

@@ -0,0 +1,12 @@
+departure class: 1-3 or 5-7
+departure 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