Day 16 2020 - this has debugging prints allllll over the place!

diff --git a/day16/input.txt b/day16/input.txt
new file mode 100644 (file)
index 0000000..2d95b75
--- /dev/null
+++ b/day16/input.txt
@@ -0,0 +1,260 @@
+departure location: 36-269 or 275-973
+departure station: 25-237 or 245-972
+departure platform: 34-576 or 586-967
+departure track: 48-199 or 206-959
+departure date: 31-172 or 194-962
+departure time: 34-448 or 454-955
+arrival location: 42-400 or 419-965
+arrival station: 36-528 or 551-956
+arrival platform: 46-456 or 466-960
+arrival track: 48-293 or 303-966
+class: 50-796 or 818-950
+duration: 46-589 or 610-957
+price: 38-55 or 66-957
+route: 37-144 or 154-961
+row: 48-832 or 853-949
+seat: 40-495 or 516-952
+train: 32-429 or 441-971
+type: 27-338 or 355-955
+wagon: 42-473 or 488-973
+zone: 26-379 or 386-972
+
+your ticket:
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+
+nearby tickets:
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diff --git a/day16/p1_71.txt b/day16/p1_71.txt
new file mode 100644 (file)
index 0000000..fe34e40
--- /dev/null
+++ b/day16/p1_71.txt
@@ -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

diff --git a/day16/p2_row_class_seat.txt b/day16/p2_row_class_seat.txt
new file mode 100644 (file)
index 0000000..b48bf37
--- /dev/null
+++ b/day16/p2_row_class_seat.txt
@@ -0,0 +1,11 @@
+class: 0-1 or 4-19
+row: 0-5 or 8-19
+seat: 0-13 or 16-19
+
+your ticket:
+11,12,13
+
+nearby tickets:
+3,9,18
+15,1,5
+5,14,9

diff --git a/day16/summary.txt b/day16/summary.txt
new file mode 100644 (file)
index 0000000..96950e9
--- /dev/null
+++ b/day16/summary.txt
@@ -0,0 +1,72 @@
+--- Day 16: Ticket Translation ---
+As you're walking to yet another connecting flight, you realize that one of the legs of your re-routed trip coming up is on a high-speed train. However, the train ticket you were given is in a language you don't understand. You should probably figure out what it says before you get to the train station after the next flight.
+
+Unfortunately, you can't actually read the words on the ticket. You can, however, read the numbers, and so you figure out the fields these tickets must have and the valid ranges for values in those fields.
+
+You collect the rules for ticket fields, the numbers on your ticket, and the numbers on other nearby tickets for the same train service (via the airport security cameras) together into a single document you can reference (your puzzle input).
+
+The rules for ticket fields specify a list of fields that exist somewhere on the ticket and the valid ranges of values for each field. For example, a rule like class: 1-3 or 5-7 means that one of the fields in every ticket is named class and can be any value in the ranges 1-3 or 5-7 (inclusive, such that 3 and 5 are both valid in this field, but 4 is not).
+
+Each ticket is represented by a single line of comma-separated values. The values are the numbers on the ticket in the order they appear; every ticket has the same format. For example, consider this ticket:
+
+.--------------------------------------------------------.
+| ????: 101    ?????: 102   ??????????: 103     ???: 104 |
+|                                                        |
+| ??: 301  ??: 302             ???????: 303      ??????? |
+| ??: 401  ??: 402           ???? ????: 403    ????????? |
+'--------------------------------------------------------'
+Here, ? represents text in a language you don't understand. This ticket might be represented as 101,102,103,104,301,302,303,401,402,403; of course, the actual train tickets you're looking at are much more complicated. In any case, you've extracted just the numbers in such a way that the first number is always the same specific field, the second number is always a different specific field, and so on - you just don't know what each position actually means!
+
+Start by determining which tickets are completely invalid; these are tickets that contain values which aren't valid for any field. Ignore your ticket for now.
+
+For example, suppose you have the following notes:
+
+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
+It doesn't matter which position corresponds to which field; you can identify invalid nearby tickets by considering only whether tickets contain values that are not valid for any field. In this example, the values on the first nearby ticket are all valid for at least one field. This is not true of the other three nearby tickets: the values 4, 55, and 12 are are not valid for any field. Adding together all of the invalid values produces your ticket scanning error rate: 4 + 55 + 12 = 71.
+
+Consider the validity of the nearby tickets you scanned. What is your ticket scanning error rate?
+
+Your puzzle answer was 22073.
+
+--- Part Two ---
+Now that you've identified which tickets contain invalid values, discard those tickets entirely. Use the remaining valid tickets to determine which field is which.
+
+Using the valid ranges for each field, determine what order the fields appear on the tickets. The order is consistent between all tickets: if seat is the third field, it is the third field on every ticket, including your ticket.
+
+For example, suppose you have the following notes:
+
+class: 0-1 or 4-19
+row: 0-5 or 8-19
+seat: 0-13 or 16-19
+
+your ticket:
+11,12,13
+
+nearby tickets:
+3,9,18
+15,1,5
+5,14,9
+Based on the nearby tickets in the above example, the first position must be row, the second position must be class, and the third position must be seat; you can conclude that in your ticket, class is 12, row is 11, and seat is 13.
+
+Once you work out which field is which, look for the six fields on your ticket that start with the word departure. What do you get if you multiply those six values together?
+
+Your puzzle answer was 1346570764607.
+
+Both parts of this puzzle are complete! They provide two gold stars: **
+
+At this point, you should return to your Advent calendar and try another puzzle.
+
+If you still want to see it, you can get your puzzle input.
+
+You can also [Share] this puzzle.

diff --git a/day16/tt.py b/day16/tt.py
new file mode 100755 (executable)
index 0000000..96d3781
--- /dev/null
+++ b/day16/tt.py
@@ -0,0 +1,134 @@
+#!/usr/bin/python3
+
+import sys
+
+filename="p1_71.txt"
+if len(sys.argv) > 1:
+    filename=sys.argv[1]
+
+rules={}
+myticket=[]
+tickets=[]
+inrules=True
+inmyticket=False
+intickets=False
+
+for line in open(filename, "r"):
+    line=line.rstrip()
+
+    # skip blank lines
+    if line == '':
+        continue
+
+    if line == 'your ticket:':
+        inrules=False
+        inmyticket=True
+        continue
+    elif line == 'nearby tickets:':
+        inmyticket=False
+        intickets=True
+        continue
+
+    # we've got a line of data - woo!
+    if inrules:
+        (rule,data) = line.split(": ")
+        ranges = [[int(a) for a in rule.split("-")] for rule in data.split(" or ")]
+        rules[rule]=ranges
+        continue
+
+    if inmyticket:
+        myticket=[int(a) for a in line.split(",")]
+        continue
+
+    if intickets:
+        tickets.append([int(a) for a in line.split(",")])
+
+def check_rules(value):
+    for rule in rules.keys():
+        for valrange in rules[rule]:
+            if value >= valrange[0] and value <= valrange[1]:
+                return True
+    return False
+
+def get_invalid_fields(ticket):
+    invalid_fields=[]
+    for point in ticket:
+        if not check_rules(point):
+            invalid_fields.append(point)
+
+    return invalid_fields
+
+print("Rules: ")
+print(rules)
+print("My ticket: ", ",".join([str(a) for a in myticket]))
+print("Nearby tickets:")
+bad_fields=[]
+valid_tickets=[]
+
+for ticket in tickets:
+    print(",".join([str(a) for a in ticket]))
+    ticket_bad_fields=get_invalid_fields(ticket)
+    if len(ticket_bad_fields) > 0:
+        bad_fields.extend(ticket_bad_fields)
+    else:
+        valid_tickets.append(ticket)
+
+print("Part 1:", sum(bad_fields))
+
+possible_fields=[[k for k in rules.keys()] for i in range(len(myticket))]
+
+def check_field(field, ranges):
+    print("Field:", field,"\nRanges:", ranges)
+    for valrange in ranges:
+        if field >= valrange[0] and field <= valrange[1]:
+            return True
+
+    return False
+
+def check_fields(possible_fields, ticket):
+    print("Check Possible fields:",possible_fields)
+    print("Check ticket:", ticket)
+    for number,field in enumerate(ticket):
+        new_possibles=[]
+        print(possible_fields[number])
+        for possible_rule in possible_fields[number]:
+            print("Possible rule:", possible_rule)
+            ranges=rules[possible_rule]
+            print("Ranges:", ranges)
+            if check_field(field, ranges):
+                new_possibles.append(possible_rule)
+        possible_fields[number]=new_possibles
+
+print(possible_fields)
+
+for ticket in valid_tickets:
+    print(possible_fields)
+    print(ticket)
+    print(rules)
+    check_fields(possible_fields, ticket)
+    if sum([len(fields) for fields in possible_fields]) == len(myticket):
+        # we have all the fields, lets break from our loop
+        break
+
+# loop until we only have one possible for each field
+while sum([len(fields) for fields in possible_fields]) != len(myticket):
+    for a,fields in enumerate(possible_fields):
+        if len(fields) == 1:
+            continue
+        else:
+            for b,fields2 in enumerate(possible_fields):
+                if len(fields2) == 1:
+                    if fields2[0] in fields:
+                        fields.remove(fields2[0])
+                        break
+
+print(possible_fields)
+actual_fields=[f[0] for f in possible_fields]
+
+# loop through the fields that have 'departure' at the start
+mult=1
+for a,field in enumerate(actual_fields):
+    if field[:9] == "departure":
+        mult*=myticket[a]
+
+print("Part 2:", mult)