day16.js

var input = `departure location: 26-404 or 427-951
departure station: 43-307 or 325-967
departure platform: 39-383 or 399-950
departure track: 31-157 or 178-969
departure date: 28-109 or 135-950
departure time: 38-622 or 631-958
arrival location: 35-61 or 69-957
arrival station: 36-216 or 241-951
arrival platform: 41-586 or 606-967
arrival track: 47-573 or 586-951
class: 31-439 or 445-957
duration: 35-925 or 939-965
price: 41-473 or 494-952
route: 45-742 or 754-963
row: 41-338 or 357-952
seat: 45-848 or 873-968
train: 37-183 or 197-952
type: 46-509 or 522-974
wagon: 32-69 or 81-967
zone: 37-759 or 780-967

your ticket:
103,197,83,101,109,181,61,157,199,137,97,179,151,89,211,59,139,149,53,107

nearby tickets:
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361,364,272,676,683,606,911,903,890,600,784,669,894,428,741,92,735,276,142,836
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107,673,817,281,543,800,59,557,739,570,891,216,149,105,728,649,86,336,464,933
148,264,782,50,901,752,706,287,61,617,300,100,538,540,563,145,816,180,686,461
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84,501,93,782,494,226,88,902,843,795,674,732,509,890,182,716,358,298,367,925
331,82,617,102,684,545,296,878,409,887,820,181,182,875,242,907,294,428,787,714
899,780,543,561,523,633,284,457,695,528,301,676,799,921,105,865,465,798,759,813
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289,946,635,736,890,494,656,665,813,736,884,341,253,758,437,281,153,104,915,817
662,897,901,104,283,731,56,655,730,204,345,542,381,641,201,297,375,806,524,565
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566,61,545,208,523,550,822,700,204,57,744,947,82,555,91,613,252,377,365,820
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663,722,210,709,289,526,567,216,101,242,917,18,381,333,566,541,573,143,572,54
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709,430,371,901,895,486,896,374,724,703,617,328,559,692,899,379,306,296,242,567
466,215,471,431,844,54,382,87,93,756,655,259,379,872,615,400,264,366,211,85
788,688,148,807,144,374,360,270,460,672,52,391,534,888,437,363,796,197,280,471
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204,725,99,945,912,831,759,812,757,141,159,816,245,57,827,663,472,430,59,798
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305,657,439,117,678,287,430,632,199,840,297,920,890,829,609,645,291,286,667,922
803,154,52,825,157,945,739,146,921,332,844,109,239,657,821,156,461,669,919,704
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680,707,13,151,366,651,430,709,274,715,891,254,201,445,917,291,179,259,794,454
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632,909,307,612,463,740,380,700,782,834,296,202,457,778,93,295,672,615,557,683
668,211,664,504,455,533,494,338,943,525,996,670,452,544,701,210,675,298,833,300
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502,839,382,374,895,377,910,292,876,701,144,929,198,684,463,827,103,542,93,692
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283,399,359,701,244,735,845,453,557,549,893,758,636,685,657,990,146,842,400,244
617,88,825,249,499,885,547,274,434,332,99,153,880,216,508,472,880,565,12,566
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147,719,730,730,466,530,827,826,788,801,446,219,808,707,360,102,464,552,897,812
294,94,241,268,875,266,923,735,379,705,466,687,90,495,879,354,722,692,947,841
180,95,690,461,142,561,379,101,283,676,650,247,471,509,846,931,548,700,538,522
451,466,674,145,434,296,654,551,503,289,372,381,586,917,89,589,734,886,371,246
715,754,758,147,638,299,895,833,833,398,940,54,100,524,546,57,241,373,455,702
572,703,529,280,399,818,255,537,403,806,264,298,759,908,142,423,494,639,915,741
403,82,814,355,183,823,893,364,881,733,368,815,738,614,505,497,550,146,875,896
367,832,911,287,178,573,93,683,924,291,286,558,178,841,333,623,569,670,724,836
810,571,87,917,758,994,51,104,534,337,681,572,559,256,879,917,293,304,917,458
571,815,871,302,831,822,881,791,724,713,568,638,798,333,278,60,246,606,714,104
555,712,567,837,136,553,642,19,208,616,712,893,363,325,303,531,631,789,501,813
150,379,138,381,434,785,823,648,357,912,128,435,573,638,888,360,730,284,636,565
671,198,93,382,527,915,263,712,253,935,267,816,453,682,527,538,399,663,886,151
742,83,329,627,509,631,799,371,893,206,365,455,182,635,534,455,372,465,684,838
643,896,898,873,873,796,438,448,402,540,626,685,939,672,435,209,459,495,282,729
257,563,832,831,552,607,218,148,279,381,555,667,657,369,942,57,558,149,689,897
208,683,569,259,978,674,697,836,215,215,140,361,714,691,940,199,57,445,302,712
208,618,563,616,777,359,671,289,300,672,665,917,619,635,528,898,639,213,895,98
278,781,547,307,371,787,920,215,631,925,880,565,268,361,616,891,881,643,144,321
538,645,728,763,211,677,690,916,373,649,212,436,371,292,268,373,380,438,948,507
257,757,917,656,560,782,664,546,925,265,795,494,647,151,531,101,534,1,613,432
334,669,818,524,887,329,375,792,669,328,784,813,494,697,447,524,890,360,399,418
837,554,677,816,622,534,720,893,883,255,912,712,341,291,687,890,400,921,101,819
740,531,292,271,816,727,371,696,590,272,270,562,544,179,817,498,147,946,881,611
616,647,847,824,845,535,700,281,153,642,478,281,197,468,447,204,908,877,550,664
755,494,271,838,108,591,58,841,245,721,90,463,714,561,875,156,542,541,267,150
366,757,681,946,548,533,135,896,507,359,824,282,15,638,305,780,640,827,781,798
827,686,639,525,672,921,573,275,883,375,733,910,545,101,996,277,827,900,288,901
254,685,548,723,729,507,100,917,763,332,634,89,404,572,690,788,921,559,839,137
662,287,204,311,468,947,919,709,664,357,52,637,690,910,894,633,373,459,457,89
652,434,365,754,757,626,720,642,277,85,289,664,559,213,148,813,826,504,821,157
666,888,545,759,107,883,17,462,58,264,537,877,913,462,887,198,362,58,106,691
101,216,650,250,328,559,854,834,622,655,447,54,946,799,727,660,705,137,95,610
296,453,724,512,296,536,921,399,884,617,821,506,61,830,280,456,536,203,562,727
844,561,634,452,806,607,495,107,813,147,927,848,809,879,247,705,705,707,742,136
839,791,504,528,631,607,633,498,305,834,277,382,724,268,787,816,18,361,918,448
716,375,438,789,250,725,886,543,275,2,523,370,108,848,897,614,60,757,911,666
291,790,472,727,560,313,276,54,93,612,92,915,103,794,676,152,267,915,298,334
692,547,107,188,293,83,215,69,461,939,757,244,723,632,84,754,524,451,535,403
665,644,5,672,719,561,379,54,645,701,430,621,613,675,703,662,916,907,831,805
288,496,724,326,305,460,714,329,839,163,829,728,638,672,450,920,286,783,543,429
726,243,522,144,452,158,295,182,359,368,892,689,362,147,783,943,307,914,288,706
102,434,292,617,876,57,666,524,299,258,151,462,645,919,109,533,197,4,454,542
911,907,564,632,803,211,707,901,708,340,556,255,781,135,404,268,375,671,526,338
802,448,451,735,99,669,349,722,609,783,429,298,692,918,642,274,135,284,428,54
661,427,600,837,273,572,801,790,945,674,832,277,529,759,539,794,361,790,383,835
453,537,875,203,536,246,586,453,484,330,60,642,295,328,207,494,216,668,919,373
680,673,923,785,137,648,590,495,100,105,471,109,914,877,500,557,383,523,522,631
534,819,694,647,691,367,468,545,689,837,64,810,146,613,909,252,756,736,690,251
757,367,662,199,947,109,200,813,428,694,737,692,429,137,689,319,700,844,97,648
662,803,618,178,85,295,711,259,652,717,94,893,616,139,438,779,651,885,264,357
570,264,105,334,450,841,568,643,845,449,883,949,434,682,820,459,672,844,617,864
531,98,150,466,921,812,464,175,260,697,278,643,876,687,914,60,61,439,297,508
876,438,837,681,615,327,409,216,703,206,370,362,680,95,804,894,531,716,302,617
802,366,211,532,556,791,551,999,876,336,543,281,538,181,836,109,208,556,903,270
94,731,528,593,507,919,330,665,543,329,700,705,59,288,654,681,884,59,891,925
531,153,759,828,242,331,835,438,612,539,631,455,616,306,985,800,826,102,725,358
538,214,780,453,692,844,797,921,814,797,638,666,211,506,359,235,907,642,137,687
364,525,458,179,694,568,153,197,181,461,361,293,18,888,942,699,253,290,728,718
718,208,730,721,733,90,445,416,361,85,844,787,463,272,713,714,690,336,198,757
105,704,302,610,947,608,544,731,264,817,719,873,740,559,927,921,277,436,820,689
209,742,656,473,151,430,375,456,731,647,848,673,272,93,824,102,983,504,812,377
498,898,94,707,607,826,756,471,129,466,844,915,251,789,566,506,471,873,285,652
788,281,57,430,822,90,764,523,294,327,882,181,377,819,611,87,282,361,820,498
381,450,892,826,603,710,670,281,399,841,274,284,675,845,805,688,613,263,673,273
671,563,276,372,108,946,263,245,688,313,439,203,699,148,360,454,290,755,687,55`;

/*var input = `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`;*/

var rules, myTicket, nearbyTickets;
[rules, myTicket, nearbyTickets] = input.split("\n\n");

rules = rules.split("\n").map(ruleLine => {
  var matches = ruleLine.match(/^([^:]+): (\d+)-(\d+) or (\d+)-(\d+)$/);
  return {
    fieldName: matches[1],
    range1low: Number.parseInt(matches[2]),
    range1high: Number.parseInt(matches[3]),
    range2low: Number.parseInt(matches[4]),
    range2high: Number.parseInt(matches[5])
  }
});

var myTicketFields = myTicket.split("\n")[1].split(",");

nearbyTickets = nearbyTickets.split("\n").map(ticket => {
  return ticket.split(",").map(field => {
    return Number.parseInt(field);
  });
});
nearbyTickets.shift(1);

var errorRate = 0;
var validTickets = nearbyTickets.filter((ticket, iTicket) => {
  // iterate over fields
  var ticketIsInValid = ticket.some((field, iField) => {
    // return true if the field is invalid
    var fieldValidatesAtLeastAgainstOneRule = rules.some((rule, iRule) => {
      // return true if the field is violating any rule
      var fieldIsValidAgainstRule =
        field >= rule.range1low && field <= rule.range1high ||
        field >= rule.range2low && field <= rule.range2high;
      return fieldIsValidAgainstRule;
    });
    if (!fieldValidatesAtLeastAgainstOneRule) {
      console.log("Ticket " + iTicket + " is invalid because field " + iField + " with value " + field + " is not valid against any rule.");
      errorRate += field;
    }
    return !fieldValidatesAtLeastAgainstOneRule;
  });
  return !ticketIsInValid;
});
console.log(validTickets.length / nearbyTickets.length, errorRate);

// part 2
var positionIsPossibleForRule = [];
var possible = [];
for (j = 0; j < validTickets[0].length; j++) {
  possible.push(true);
}
for (i = 0; i < rules.length; i++) {
  positionIsPossibleForRule.push(Object.assign([], possible));
}
validTickets.forEach((ticket, iTicket) => {
  // iterate over fields
  ticket.forEach((field, iField) => {
    // return true if the field is invalid
    rules.forEach((rule, iRule) => {
      // return true if the field is violating any rule
      var fieldIsValidAgainstRule =
        field >= rule.range1low && field <= rule.range1high ||
        field >= rule.range2low && field <= rule.range2high;
      if (!fieldIsValidAgainstRule) {
        positionIsPossibleForRule[iField][iRule] = false;
        console.log("In ticket " + iTicket + " field " + iField + " with value " + field + " is not valid against rule #" + iRule, rule);
      }
    });
  });
});
console.log(positionIsPossibleForRule);


// fine lines that have only one true and propagate false to the other lines
var compare;
do {
  compare = JSON.stringify(positionIsPossibleForRule);
  positionIsPossibleForRule.forEach( (position, i) => {
    var numberOfTrues = position.reduce( (acc,val) => { return acc + (val ? 1 : 0); }, 0);
    if (numberOfTrues === 1) {
      var index = position.lastIndexOf(true);
        positionIsPossibleForRule.forEach( (position, j) => {
          if (i !== j) {
            position[index] = false;
          }
        });
    }
  });
} while (compare !== JSON.stringify(positionIsPossibleForRule));
console.log(positionIsPossibleForRule);

var product = 1;
positionIsPossibleForRule.map( (position, i) => {
  return position.some( (fieldIsPossible, j) => {
    if (fieldIsPossible) {
      console.log("Column #" + i + " is " + rules[j].fieldName);
      if (rules[j].fieldName.startsWith("departure")) {
        console.log("In my ticket, this is " + myTicketFields[i]);
        product *= myTicketFields[i];
      }
      return true;
    }
  }) 
});
console.log(product);