Day 6

6/1-2.zig

@@ -0,0 +1,41 @@
+const std = @import("std");
+
+pub fn main() void {
+    const input = @embedFile("input.asc");
+
+    std.debug.print("Part 1: {}\n", .{findDisctinctSubstrIdx(input, 4)});
+    std.debug.print("Part 2: {}\n", .{findDisctinctSubstrIdx(input, 14)});
+}
+
+fn findDisctinctSubstrIdx(input: []const u8, n: usize) usize {
+    // Loop through all the groups of 4
+    var i: usize = n;
+    group: while (i < input.len) : (i += 1) {
+        const slice = input[(i - n)..i];
+
+        // See if each one of them is unique in smaller groups.
+        // Ex.: is 1 in 234? -> is 2 in 34? -> is 3 in 4?
+        var j: usize = 0;
+        while (j < slice.len - 1) : (j += 1) {
+            const needle = slice[j];
+            const haystack = slice[(j + 1)..];
+
+            for (haystack) |blade| {
+                // We found a match, throw batch to garbage
+
+                if (needle == blade) {
+                    // We know this character appears somewhere else in
+                    // the haystack. As long as this letter is here, this
+                    // n-letter work will be invalid. Skip ahead.
+                    i += j;
+                    continue :group;
+                }
+            }
+        }
+
+        // We found it, get out
+        break;
+    }
+
+    return i;
+}

6/input.asc

@@ -0,0 +1,2 @@
+bfdbbngnvnsvshhhrvrbrtbrrhqrqgrrmmdfmmqttptltntrntrnrcrdcrrctctdtwtrwwmlltcltcllmpprvvtbbmbvbsvvqwvvscswsqqgzqqppvzppnddjwddlrdlllmwllfccdfccswwrhhndhdhfdftdfdcdcllcjjbsbgssvlvrrhfrfjfpjffvnfvfwfzftztwwrhwrhwhwddpjjmhmgmsssstzszqzfqzzprpzpnndttphtpphvvcpcjppdtdwwqgwwwnhwnnvhvsvqqtrrbsscwssgwglgwlldjdzjjbsjbsbvvpbvppvfvqvbqbzzwtwbwpbbbcffdgggpnpfptpfphfhfthfthffzrrbzbcblbmmzmhhnvvqvlvwvzvtztgzznbbcqbccwhcwcnwnhndhhgcghhlthllplvppgngrgsswfsfnfjjswstsrtrhthhqzqggdtggzvvjljddqdzzrmrjmjcmjmrrwlldttrhhfjjgbglgjlldrllppnwpnwnndrddtdqdhhpccbgcgzzswzztgzzrwwzzmtztvvrtrgttvddwvwvmwvmmdjdrdtthqhgqhggldgdfdnnzjnjffmrrnprnpnssjrrbrjjrrzvrvhvllfvlvnlvvhlhrhzrzrsrswrssjvjdjfjwwjmjvjjthhnjnmnppsccmlcclfclcbllldwldwdlwddbddmnmrmgrmmtsszgssqjsqscswwzmwmbwwvqqbtbtwwpbbwdbdbhhqmqgqddflfmfnmffbtfbbsdsffspsjpsspzszccrsrstrtjrjppcrrpqqvttsbbjtbjjpbbccmzznvvzzvnvmmwmhmvmsstlssqtssvggtbgttgvtggfhggbcgcmcrmcmhhbttdlttfrfprrvttrtggcpplccqggcwwdjjjplprrbsrbbjsjbbfhbhphtttpffdgdgjddzldzlzplpnplljttdqqlmlllhzhjhccpwcwhwwbbqtqffjpfpfpjptplltbtzbbwwvggpcpprdprpbpvvgzgczzfffzcfzccjffrmrhmrhhchvhddsvswscsnnpfppdrdcrdrgdgmdgmgllhggjwggvqvmmvrrzpprhhqfhfvffvlvnlngnffbbtccfbfhfwhhhhwcwzwjjbffvrffqrrnsnwswrsrvrjvrvprpsptspttbztzfzlfzlflcflclqlplglmlqqvlvvhccmmddqvqzvvmlllvnlnhnfnwnlndnntrrhvvgjjnpnggfqgqdqqzvvclvclvlfvlvvlzlssqffmrfmfmjjczcmmmnttnfnmfnmmmhmggjgdjjqmjjvsslszlzrrpdpcpfcpfpnpssvtsvtvllbttzzljzzhrrnsnddjgdjgjljzzvhvddmdvvdtdmmpmqmnnwcwfwbfwwsvvbpvvgvnvcvdvtvrrcppwbppcqpccwqqzmqmmzczppwbbrzrjzzcrcvrrpttrjjcdjcjfcclscstthqhfqhffdcfdfqdqldddsswbblppdmdnnjvvhwvhvjhvjhjhlhcclrrcqcgcjgcjjtbtctbcbsccfwwltlrlplpfpjphplhhgtghhrppwhhrprwpwhhdqdpdwpwwtccvncvvvrpvphpssfpplcczttltgltldlmlqmmbsszdszznpprsprsprsppsbppjddjhhnrrfsrffmlmglgmlglccddpssdpsddhhfmfsfrfsfnnlggfrgghmgmrmprmprrnvrnnbqnqddhhfwfmfwfmfpfdfzdzppsbpsbpprfrvvwvtwtltvlttrhhgvhhjttmssdggnzzvmvcczmzbzwzttvtpvpcphcctmmhshjsjbssglsglgtltslscchhhsjjpljjdtdsdpppptlpprmppwdppglgmggnddztdzddzppswwmhfbpqzffjqgmsntwsnrwqrqwgpwgrbpbjwrhbcdcvqjnwslsnwhglcsjbwjhswjvzssfqgwbbdgbwfrblfmmlmsndhtlbwzfwsspqlncspqbgbnzshbwpvrmjqjzbcbzzdgssbtqdzffjphqjvrspfrjhpspbwcjwbfhqzsdnjwqjzjtjgnbrdbwqhzffphzppvlmsmppqcfjbjbdsnbwtvthwqcfrtfrwchnmqmhnwfcjtbwqwwvlnpmwlrvzwljrljzqstzglqwbzfdftzltlcbvmmfwcjqglvznztwnvzvftpndqmngqswppsnqhdbgthrddfbcfpflpndrhmcqwvnbfztsvnjjdwqgpmvdwvdftgbtvrwbnvvrwsdfzhwbwdhlpzbcqdzhbfqtpjqcmrpvcsrmcwvgghqrclfzpfgnppzmhvdhvdfrcrnjbdcwbftcqjhhfdsnfnwjzjllzzqftzsjrqnsbpjdcswhhmwwdzmvmqcjtqnczjcvzmmqwzjhjpcczgpbmcvbwmpmvnghlrgcmrrdnmjvmvnhtpfpgwgmdfzvlbclzjzwdqqcvfhhgfzdhzpdvfmwjlzzrpdgzmttmvvcplbwfzqftcgcwcgcpgwvnmlqsplpqwfnhwvqtlwcspqdzshsqnlcpqhpcpbwdhdjsmvtbqdwbcrscqfjcrcjhbjbpzbshpbmlcthmbjfwhzfphgbfqfnfztptzvdnwrpslmdtpmzmpbsszqshwdghrbtvhwzhcmpcgfqggpgzwmhhdrlhlvnpzvwwhzqvgvhrzngttcnqgjjhnblncnqnjzlwnmwnrtvwjtnrbhthncwmzwqdbdgtwrncljddnbhmphgjzfrrgmmcwfwjwjlcrhvcdtvsrvsfhmlgmzsgjchhrfmqslmdgtdtrlbhdffddvbsdbdwlwdcmcmmpvzpdtmbthjdzlpwftptpfsggmhjfjwvbwljsfhfwtbfwmczwhbmhvzllqtcqqfbrcdqqsrcpfmnswnfzfqghcmcbqwgvzqpwvvmbpddlhgjgzvgmpljznrhqphwcztqzpnhzqdgpwwclmsgpwnwtvtsjsdmcnvmjbqglttrhbzqdbgwnbsqzmsmztndrtmlpszhzgjbbftbsdwwdrlftrbbnrsqshfhdpdrwmztcqzdjlnthnjhppwntmbqdgzpmfmfnccblsdwljqhjfgtlgvpzpjbsndmwzfwrbmdhpnmbchqlwqtbhhhqqbsfnvscjwrzvjdtvbsqwzvfhwbbjgqpzcwqjdrlfmggzmhbcrhtbqdjntbtqdvmvpqflmccfpnbmnmtqbdflsgczpbsqpfphlzqgvwbjlmsgshrhpcljzdvwvdvlqqwchtjmjgtqjhgwtnddmhphwhvwhtrhfbjjjzfgrcqngnnddctzdzlqjlbdwmjqzccwrvctrzgtzqsswggbqdnplclhtdslcvzhppcjjslnshtwjnbrwdprqhdtfqmqpgfgnqtdnnhrnzfrsqhlftpdslgmmvqhvpjqjwpwgtnmgrbhwntdjftfwtjzjtprctbtsjmqmpcbbtrjvsgqgsfjprqmsmdztbhnbgzldqfzgwqwnnccgcfclctrwqmqpgvfglgsmmpjszqnphnzcnvswpsfsrmnsnlqnpmvfdvdtfgzrdmbftdrrrbfsvzfgmnffvjpcpnndrwhtjjrrvnztlfhcvfqjgfrhtbnhmwnrmwdhzmmtvjmsqmghtbtfjwdnvdcqtqjrfhrwscjftmbgjmcsrbpdpttlmvfmnfjhnptqvggnshzqnlqqdpqqsqssppbwpblhgfrwrblpzwvqphpsgfmbpqtqqpjpgnbblzstgcjhqntgpbfwlzzctqbnbvpgwsdsdldqzhvznqcsrrghpwllshqpdlqnqgzfwrnhwsvhftzplspcbqmclplprlthvwjhdndrjblqdgwvgjlbmblbmcnbzwzdlnpnhhppvrtngvqqwsttgwlvtcqmtrvpbnvcnfqdtqrsrsmhclmtgbdwwdvhwgfcqpmprcpdhqwftcchbwvstcdqrlwtgbcfqfgzprgvpbbzlqfzbqtcrlzscnqpqwtgzbbbdvsvmhggdr
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