From 33736f8d368e9de63ef739efbff5eae7f07cba8a Mon Sep 17 00:00:00 2001
From: Ben Ashton <ben@n0m.org>
Date: Tue, 6 Dec 2022 11:38:40 -0700
Subject: [PATCH] Day 6

---
 6/input        |  1 +
 6/solution.mjs | 32 ++++++++++++++++++++++++++++++++
 2 files changed, 33 insertions(+)
 create mode 100644 6/input
 create mode 100644 6/solution.mjs

diff --git a/6/input b/6/input
new file mode 100644
index 0000000..5f190e2
--- /dev/null
+++ b/6/input
@@ -0,0 +1 @@
+hqhnqhqshhslswsffchfcfbblvlblqlggfwwqfwwqdddbbbhzhjjrqjqbjqjwqjwqwhwrrmcrrjqjjlllcvcrrnpptzpzmmswmmzrzjrrfcrfccpbpzzvrrdndllttwftwwgzzwhwggdvdnnlrnncscbcfcctchcdchdccztzgzjjtdtcdtcchrrgpgzgsgpsggvtvppdccfhcfclfcfdfnddlbbptbtdbtdtjdjgdjjzljlssgbgcgqcqzccfnftfjjsgstggsngsscvssjzjnjtntvnvssrqqhtqtvqtvvjbvvbnvvqvmvrmmdsdvdwwnbnvbnvvcgvcczcfzftfsfrfsfttldtdrrgrgmgbbdvvbqbhqbqlqsqbsbpbgbvgbgwwrswrwrwttvnnzdnzzwggrmrfmmvllzwlwzzlvlbvllgsllpnlnvncvcvqqrwwcmcczhchzczbccdwcwvwzwwvddlwlhljlqjqnncntnctczzmwmlmccpggljlssqswsmmpvmvwvrrcpcrprmprrtdrtdrrsjsmshmmdpdlppbnbvvmmflmmjvjhvhjvjsjbjwjvvblvbvlbbllwlslvljvlvdvdgvgcchnhpnhnvhhtfhhvssczztlzzgvvqqghqgqssdscsnsrsmrmmwgwmgmlmdmggbgzbgzgdzdzccghgfgddtntftddpdrdrmrjmmmzttqmttnwngggtgtqtqnqhnqqpnnntrntrnnshhjtjzzfqqblqqlblslflmlttcwtwzzrlrnrcrrrgtrrftfhthzhggwggvgvvfvddcnddfjddzqzrrvtrvrfrrgpgrgngsgddlmddzgzppdzzjzhjhjhqqbpbvvlrvrsvrvnrrsgsttndnbngnppmlppvgvfggvcvrvnnsnfnnfqfwwppnddrrfqqgbqqfmmlnlnngwgcgjgnjgjsgjgqjjnccdttpqttswwcgcmgmccrppmqmbbfwwvdwdfwfjwfjjblldsdrdvvgcvcwwllfpllcslsvssnvsnvvhnvnvwwcgwccslsbbnlbnbrrrtprptpdpdvdttgsgwswppcdchhqbqcbqbzbgbbstshthsttqgtqtpqqzhhwhghwwmbbdlbbtlltsllbvbnvvmqvqtvqvttlwtltmmrttwgtwwfdddwcchtchhbthbbclczzqbzzpvvwzwswggjddntnrnnwmnnbdbmbccqgqvvsnvvqbvbzvvzmvzzrfrlfrfhhdvddnmnnmhmqhhrhlrldljlbljjgqqvdvhhgmgvgddmmznndmmhssznsswvwdvdzdhhscssntnftfmmrggbmbmgmlltctbtbntnqqscqcscrcrhrlhhdchhzccvvbfvvpfffbwbsbjjmgmwgmgppjnpjphhlmhhpwwhwzhhhzbbzzcbchhpnnptpvphhsdsccffqbqllchlhlwlcljlppnccqsstzstswtwwljwjmmpttvqqspsjjclljqqlhqqtnnbrrsbrbjjllrmrjmjzmmclmclmmcvvbddhnnmhmbbwqqqhrqqtqmqbqdbdtdvvcscshccmffhqffdgdcgddljdjbdbjbdbrrtjjtnntpntpnpmnpmpgghffrnfrnnmdnmnhmmjcjffftrrttfwfvwvcwwrmwmpwmmnvntthmmgmbbcdclcppjhpjhjwwlppgsszqqwggmttfrfqflfsfmmmhchshmmjtjjgdjjnnsvsmsnwcgdfqljmnphlfdrhpggfqnhnszgpndhdqcgfhtdcgbsbtmhvnnrmqzqqcjdqndzbnrhwjvbvcldmnwltgpqbmstntnggtbqjzzqrfdsfttdfrcnsrpwrjrjqbgtjfmlwsrzdbdqvbtczgsjqhtgmctjfmdglfrsvqtgwpbqghzgzdfwzhbdhlmhdvhwjrdhhtjptvwpmjnmfcjdmdczmczvdqwvbgtvlwvwnvdlbqfshmlmvzzcmjbtpwpwgsqhfsgljzhbppcztfjdntzcvllqnzrqjwfjrlgvhmbpvbtqjrdzcsmcjzcdsmvcmhrbhgnscnfrfmscqsqpqplbrzhsrlsvvpmfdtdmtlrtvspmlljmfpshfmstjgnrrwmqlbnwbndcfdstrtqtnzpfqlcgrzmsnmhllljdgtmvftjttbwhqzcqwbwdbshgcqrptfjwbbfsjnvzztlbdchqrlbbrcnsswmhwphfwrbnvrncbrthprmltlwwlfpbqhdfqzwwcwjgqzdnvmhwpzpbtpwwvzcpfcsfqpwjljzzfwzmlfvhsccppzlzjlrvlpdtjpcptnvqjwtdbzrqwnfwmmjndflqqggczrfjlpdfjffctprnmhfdqvnzbfvhszzdmngnlmwzfdrbvlvjnmbllgrczssqcrhbmnpmqlrzgmqmhgsvcdlqnmlhlzvqzhnccbctslzlbcpdvqltqncpcrzwdchrqmwfwlcbcvfnnpjntfrznqdjsdtzqjjttddwvnfqmznhflblzvvtbwdzrrlqlmndzzzwnpbhhlvlbswfjtbnhlccscbnfgjtwbfdlwvzszwnwzhlbcdpvgqjcrpzsvvnfwqcqvrmhzhggvmzwggdpbfrdscjwhsdsbbjcnzldhzcvqtjrhsbfjlrlpvtcqhnnsvslfrdjvjhfhdcfzqchpvvhzbpqglqlrdttrdtndzhnzhtqndghtgmpsnhptprqzhbbdcrgmbvrvqmbptqgnmsccwmhrlpddvmhjntllwrzqwnsjchnblcgndjtmpswwgcstdftqcbhzgttrhnpvrhspjznhhvrlpdqbzzrvzjphcswhljdldvsrdhzltwgrcsvqwnhtqqjjrjgrplzmsnjhzrfbtqgdfgnbpvjrfzrrpdphgzrfbswdhzgbzswqtwwdtrvvswmjvwhqddfzjhgdqsfnwbmlcfwtmpldrdpwjwggbpmncvbghzjmpsqpvnmbhjfzzpsjdgmrtnndhzrphjzdbgrrnthtrfnspdngbdmwbnfjlsndqswfsvfqftqlgqjpfsfpmdbsjfrptvbpvflqgvlmmbchhghhrwmvdlrhlsdtvjjchwglcrwfsfnnbhjbtccbjsfwrbzrvgsbfnvzghhrqblqchjvdtrrbrwwwmfnczzmmrqdggsfrqbldbbfbbcthtsvpcnlbjjztwvhctbrjltqdwbzmrrfslbmjpnqwllbvjzgfsfqqtwbgwgclgdflshfhwggwdqlgbmdmdqglrtfwbddtsltmsvswhgjtqwtnrncpdzhnpfqcjnjzmtbjfzpjwgfbfggmsmfdhfbjctnhchpgfspthdbfpmvrmdbbspvwzqqwnmfwdnnblbcjszbccgflngnjjwsqshfbhjwgzrmvsgnrdbgwfhdvpmznpnvznfcqdclztcptjrrpbmpztwwbvlvtmngfhmfbfmrjbjzlrcvgllrlgthltstnwmffntqrwsrndlzqhztwpcwbdjjztgdzmgtthcvtvnjzzhvstfqhgddddgdsrbcqzqspjrncphhtbnslzphrtfqphffjrrlgwbrwqfzzqvzhnffcwvrncttgplshccglvchvlcbnlthhmzvcrfjvjqfsjjzzgqlpslfwngqnbgcwffpcqhlmlhvwssrpjbrcbftpzbbpptzrdqwpzpdjhtwbvwcqbfnwtflfgzgttglpcwdnzsmjffgfftdnpzlpszmzrrhvlzdfpgbzqlvvfslnndcmjvvpwzwcdzpcttfwbsdswmfqbbhbfbjvbvtspbbhmphzjsjcmmzpvvzhtvzlgwlqqvbnrgtszvghjfmchrwwhpmbsvfmgvqdtmvdtjppchbsgqrtgtnzczqmpgjdbmmflfpjbcdmhldwpgdtdvsbzhztjzfhcsbndfjntbldjnqwdffqspfnlplbtcdjtwdjhldtsdfrnmpfhzghnpcqlhhgblmqjvwhndqfbccvzzlbzbdprvcpwjjhrqnjptwssbjhgvpgtfzqwrzjvbdgwtnmptvdjrffcmbzmzcmrfbjv
diff --git a/6/solution.mjs b/6/solution.mjs
new file mode 100644
index 0000000..0dae9e8
--- /dev/null
+++ b/6/solution.mjs
@@ -0,0 +1,32 @@
+import { readFileSync } from 'node:fs';
+
+const input = readFileSync('input', 'utf-8');
+
+function isValidMarker(marker) {
+  return marker.split('').every((c, i, word) => word.lastIndexOf(c) === i);
+}
+
+function findMarker(markerLength) {
+  for (let pos = markerLength; pos <= input.length; pos++) {
+    const marker = input.slice(pos - markerLength, pos);
+    if (isValidMarker(marker)) {
+      return { marker, pos };
+    }
+  }
+}
+
+const packetMarker = findMarker(4);
+if (packetMarker) {
+  console.log(
+    `Found packet marker: ${packetMarker.marker} after: ${packetMarker.pos} ` +
+    `characters`
+  );
+}
+
+const messageMarker = findMarker(14);
+if (messageMarker) {
+  console.log(
+    `Found message marker: ${messageMarker.marker} after: ` +
+    `${messageMarker.pos} characters`
+  );
+}