20 lines
664 B
JavaScript
20 lines
664 B
JavaScript
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// I didn't expect this to be very efficient but it acually was pretty quick
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const fs = require('fs');
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const [fields, myTicket, nearbyTickets] = fs.readFileSync('./input.txt', 'utf-8').split('\n\n');
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// make set of all valid nums
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const valid = fields.match(/\d+-\d+/g).reduce((a, v) => {
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let [start, end] = v.split('-').map(a=>parseInt(a));
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for (let j = start; j <= end; j++) {
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a.add(j);
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}
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return a;
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}, new Set())
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// get all nums on nearby tickets
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const nums = nearbyTickets.match(/\d+/g).map(v => parseInt(v))
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// find all the nums that aren't valid, add up the total
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let v = nums.filter(num => !valid.has(num)).reduce((a,b)=>a+b,0);
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console.log(v)
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