21 lines
499 B
JavaScript
21 lines
499 B
JavaScript
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const fs = require('fs');
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const data = fs.readFileSync('input.txt', 'utf-8');
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const lines = data.split('\n').map(num => parseInt(num));
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const preambleLength = 25;
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let first
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for (let i = preambleLength; i < lines.length; i++) {
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valid = false
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for (let j = i-preambleLength; j < i && !valid; j++) {
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for (let k = j+1; k < i && !valid; k++) {
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if (lines[j]+lines[k]== lines[i]) {
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valid = true
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}
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}
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}
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if (!valid) {
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first = lines[i]
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break
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}
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}
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console.log(first)
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