diff options
Diffstat (limited to '16')
| -rw-r--r-- | 16/a.rb | 28 | ||||
| -rw-r--r-- | 16/b.rb | 76 | ||||
| -rw-r--r-- | 16/input.txt | 262 |
3 files changed, 366 insertions, 0 deletions
@@ -0,0 +1,28 @@ +sections = File.read('input.txt').split "\n\n" + +fields = sections[0].split "\n" +tickets = sections[2].split "\n" + +valid_values = Hash.new false + +fields.each do |field| + ranges = field.split(/.*: | or /).slice(1, 2) + ranges.each do |range| + from, to = range.split('-').map {|n| n.to_i} + (from..to).each do |n| + valid_values[n] = true + end + end +end + +invalid = 0 +tickets.each do |ticket| + values = ticket.split(',').map {|n| n.to_i} + values.each do |n| + if !valid_values[n] + invalid += n + end + end +end + +puts invalid @@ -0,0 +1,76 @@ +require 'set' + +sections = File.read('input.txt').split "\n\n" + +fields = sections[0].split "\n" +my_ticket_line = sections[1].split("\n")[1] +my_ticket = my_ticket_line.split(',').map {|n| n.to_i} +ticket_lines = sections[2].split("\n") +tickets = ticket_lines.slice(1, ticket_lines.size).map {|t| t.split(',').map {|n| n.to_i}} + +valid_values = {} +valid_all = {} + +fields.each do |field| + f, range1, range2 = field.split(/: | or /) + valid_values[f] = [] + [range1, range2].each do |range| + from, to = range.split('-').map {|n| n.to_i} + valid_values[f].push (from..to) + (from..to).each do |n| + valid_all[n] = true + end + end +end + +candidates = [] +my_ticket.each do + candidates.push(Set.new valid_values.keys()) +end + +tickets = tickets.filter do |ticket| + ticket.all? { |n| valid_all[n] } +end + +tickets.each do |ticket| + ticket.each_with_index do |n, i| + valid_values.each do |field, valid| + if !(valid[0].include?(n) || valid[1].include?(n)) + candidates[i].delete(field) + end + end + end +end + +decided = Set.new +mapping = {} +changed = true +while changed + changed = false + new_decided = candidates.find do |c| + if c.size == 1 + f = c.to_a[0] + !decided.member? f + else + false + end + end + if new_decided + index = candidates.find_index new_decided + field = new_decided.to_a[0] + decided.add field + mapping[field] = index + changed = true + candidates.each do |c| + c.delete(field) + end + end +end + +product = 1 +mapping.each do |field, index| + if field =~ /departure/ + product *= my_ticket[index] + end +end +puts product diff --git a/16/input.txt b/16/input.txt new file mode 100644 index 0000000..a9cead9 --- /dev/null +++ b/16/input.txt @@ -0,0 +1,262 @@ +departure location: 40-152 or 161-969 +departure station: 39-838 or 845-971 +departure platform: 39-209 or 217-970 +departure track: 47-76 or 82-955 +departure date: 41-167 or 178-949 +departure time: 25-652 or 660-953 +arrival location: 36-798 or 810-964 +arrival station: 30-688 or 702-973 +arrival platform: 44-248 or 268-969 +arrival track: 45-536 or 552-956 +class: 29-751 or 760-951 +duration: 40-912 or 934-971 +price: 44-896 or 911-965 +route: 32-582 or 590-953 +row: 46-269 or 282-971 +seat: 49-114 or 134-971 +train: 37-395 or 401-969 +type: 43-180 or 206-960 +wagon: 41-462 or 480-953 +zone: 35-411 or 427-960 + +your ticket: +139,109,61,149,101,89,103,53,107,59,73,151,71,67,97,113,83,163,137,167 + +nearby tickets: +660,948,772,679,610,713,875,887,750,335,895,553,774,802,797,336,823,566,861,599 +428,760,595,55,490,877,63,570,742,735,830,854,566,989,292,748,445,876,677,329 +396,92,686,894,353,668,666,794,743,142,604,344,437,440,352,680,439,431,636,385 +319,322,318,301,736,485,727,437,679,486,129,516,488,643,560,880,384,846,609,644 +851,865,837,744,150,624,140,569,627,733,607,352,221,630,731,212,331,713,674,635 +690,681,593,411,865,494,673,814,482,707,626,636,384,661,857,514,896,613,526,941 +64,720,331,225,602,4,90,719,739,83,887,101,559,603,616,872,782,349,450,320 +235,449,339,427,24,770,554,428,646,235,851,710,234,911,823,489,436,336,324,652 +827,863,569,290,483,286,432,592,619,306,790,405,443,333,57,399,355,60,674,102 +669,429,282,362,368,400,714,819,582,766,485,344,785,449,302,771,561,650,288,946 +875,107,715,780,53,178,405,284,484,497,400,395,817,848,729,139,725,61,240,245 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