Ben Ashton
1 year ago
2 changed files with 33 additions and 0 deletions
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import { readFileSync } from 'node:fs'; |
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const input = readFileSync('input', 'utf-8'); |
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function isValidMarker(marker) { |
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return marker.split('').every((c, i, word) => word.lastIndexOf(c) === i); |
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} |
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function findMarker(markerLength) { |
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for (let pos = markerLength; pos <= input.length; pos++) { |
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const marker = input.slice(pos - markerLength, pos); |
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if (isValidMarker(marker)) { |
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return { marker, pos }; |
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} |
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} |
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} |
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const packetMarker = findMarker(4); |
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if (packetMarker) { |
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console.log( |
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`Found packet marker: ${packetMarker.marker} after: ${packetMarker.pos} ` + |
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`characters` |
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); |
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} |
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const messageMarker = findMarker(14); |
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if (messageMarker) { |
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console.log( |
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`Found message marker: ${messageMarker.marker} after: ` + |
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`${messageMarker.pos} characters` |
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); |
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} |
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