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AdventOfCodeDay16.js
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AdventOfCodeDay16.js
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var readline = require('linebyline');
var aoc16_1 = function() {
const rl = readline('./flight tickets day 16.txt');
var tickets = [];
var rules = {};
var phase = 'rules';
var myTicket;
rl.on('line' , line => {
var ruleRegex = new RegExp(/^([a-z| ]+): (\d+)-(\d+) or (\d+)-(\d+)/);
var myTicketRegex = new RegExp(/your ticket:/);
var ticketsRegex = new RegExp(/nearby tickets:/);
if (ruleRegex.test(line)) {
var matches = ruleRegex.exec(line);
var intervals = []
intervals.push([parseInt(matches[2]), parseInt(matches[3])]);
intervals.push([parseInt(matches[4]), parseInt(matches[5])]);
rules[matches[1]] = intervals;
} else if (myTicketRegex.test(line)) {
phase = 'my';
} else if (ticketsRegex.test(line)) {
phase = 'nearby';
} else {
if (line !== '') {
if (phase === 'my') {
myTicket = line.split(',').map(t => parseInt(t));
} else {
tickets.push(line.split(',').map(t => parseInt(t)));
}
}
}
});
rl.on('end', () => {
var invalidTickets = [];
var isValid = function(ticketId) {
for(rule in rules) {
for (var i = 0; i < rules[rule].length; i++) {
if (ticketId >= rules[rule][i][0] && ticketId <= rules[rule][i][1]) {
return true;
}
}
}
return false;
}
for (var ticket of tickets) {
for (value of ticket) {
if (!isValid(value)) {
invalidTickets.push(value);
}
}
}
var sum = invalidTickets.reduce((prev, curr) => curr + prev, 0);
console.log(sum);
});
}
var aoc16_2 = function() {
const rl = readline('./flight tickets day 16.txt');
var tickets = [];
var rules = {};
var phase = 'rules';
var myTicket;
rl.on('line' , line => {
var ruleRegex = new RegExp(/^([a-z| ]+): (\d+)-(\d+) or (\d+)-(\d+)/);
var myTicketRegex = new RegExp(/your ticket:/);
var ticketsRegex = new RegExp(/nearby tickets:/);
if (ruleRegex.test(line)) {
var matches = ruleRegex.exec(line);
var intervals = []
intervals.push([parseInt(matches[2]), parseInt(matches[3])]);
intervals.push([parseInt(matches[4]), parseInt(matches[5])]);
rules[matches[1]] = intervals;
} else if (myTicketRegex.test(line)) {
phase = 'my';
} else if (ticketsRegex.test(line)) {
phase = 'nearby';
} else {
if (line !== '') {
if (phase === 'my') {
myTicket = line.split(',').map(t => parseInt(t));
} else {
tickets.push(line.split(',').map(t => parseInt(t)));
}
}
}
});
rl.on('end', () => {
var invalidTickets = [];
var isValid = function(ticketId) {
for(rule in rules) {
for (var i = 0; i < rules[rule].length; i++) {
if (ticketId >= rules[rule][i][0] && ticketId <= rules[rule][i][1]) {
return true;
}
}
}
return false;
}
var matchesRule = function(ticketId, ruleName) {
var rule = rules[ruleName];
for (var i = 0; i < rule.length; i++) {
if (ticketId >= rule[i][0] && ticketId <= rule[i][1])
return true;
}
return false;
}
var validTickets = []
for (var ticket of tickets) {
var valid = true
for (value of ticket) {
if (!isValid(value)) {
valid = false;
break;
}
}
if (valid) {
validTickets.push(ticket);
}
}
var positions = {}
var matchedRules = []
while (matchedRules.length < Object.keys(rules).length) {
for (rule in rules) {
if (matchedRules.find(r => r.rule === rule) !== undefined) {
continue;
}
positions[rule] = [];
for (var i = 0; i < Object.keys(rules).length; i++) {
if (matchedRules.find(r => r.column === i) !== undefined) {
continue;
}
var valid = true;
for (var ticket of validTickets) {
if (!matchesRule(ticket[i], rule)) {
valid = false;
continue;
}
}
if (valid) {
positions[rule].push(i);
}
}
if (positions[rule].length === 1) {
matchedRules.push({rule: rule, column: positions[rule][0] });
}
}
}
var neededPositions = [];
for (position in positions) {
var departureRegex = new RegExp(/^departure.*/);
if (departureRegex.test(position)) {
neededPositions.push(positions[position]);
}
}
var product = neededPositions.reduce((prev, curr) => prev * myTicket[curr[0]], 1);
console.log(product);
});
}
module.exports = (function() {
return {
aoc16_1: aoc16_1,
aoc16_2: aoc16_2
}
})();