24 lines
546 B
JavaScript
24 lines
546 B
JavaScript
const fs = require('fs');
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const PREAMBLE_SIZE = 25;
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fs.readFile('input', (err, data) => {
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if (err) throw err;
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let input = data.toString().trim().split("\n").map((line) => Number(line) );
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let buf = input.slice(0, PREAMBLE_SIZE);
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for(pos=PREAMBLE_SIZE;pos<input.length;pos++) {
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let next = input[pos];
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let sums = new Set( );
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buf.forEach((a) => buf.forEach((b) => { if (a != b) sums.add(a+b); }));
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if (!sums.has(next)) {
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console.log(next);
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break;
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}
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buf = buf.slice(1, 25);
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buf.push(next);
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}
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});
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