34 lines
758 B
JavaScript
34 lines
758 B
JavaScript
import { readFileSync } from "fs";
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const input = readFileSync("datastream.txt", "utf-8");
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function checkForDuplicates(arr, howMany) {
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const map = new Map();
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arr.forEach(char => {
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map.set(char, true);
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});
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return map.size === howMany;
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}
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const arr1 = new Array(4).fill('');
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const arr2 = new Array(14).fill('');
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let i = 1, startOfPacket = 0, startOfMessage = 0;
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console.log(arr1)
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for(const char of input) {
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arr1.shift()
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arr1.push(char);
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arr2.shift()
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arr2.push(char);
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if(startOfPacket === 0 && i > 4 && checkForDuplicates(arr1, 4)) startOfPacket = i;
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if(startOfMessage === 0 && i > 14 && checkForDuplicates(arr2, 14)) startOfMessage = i;
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i++;
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}
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console.log(startOfPacket, startOfMessage); |