day 6 in rust

rust/6/README.md

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+every time I open rust I want to have a clever functional solution where I just chain some iterators and it pops out the right answer with zero mutable state
+
+and more than half the time I end up with a fucking imperative loop juggling like five mutable variables
+this would be like completely trivial to rewrite in zig, I literally replace the vec with an alloc of an arraylist and heck reuse my indexedset from day 3 (or maybe write my own dedup for fun but meh) and bam it's literally just C tier code

rust/6/input.txt

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+dcbcsbblhhgdgssmcmqccdwdvwdvvcfvcfvvpvmmwccdqddshhdppcfpfbbfggfjfvvhzhmmsqswsttcgtctggjllhnnqbnnnldlglplvlbvbzztpzzvpphshwwfhhgssvgsvvpfvfzznbznndqqtsqttnvtvqqqrgqrrgzzlqzzbvzbzmzffnbfnbffcggdcggqhqpqzpqzqbbqvbqbhhtzhhrrrprlrclrcrssqspqpbblggfvvbpvbbssvttsztzpzjjwffnpnfnrrqhqgqrrzqzbzzdpdjpplpclpptltztjtztqthtmmmpsmmpjpqpvvshhsfshhrvrdvdggwssdbbzbttlmlmpprmrmlrrmqrqsshjhjljzjnjllbbvjvnnppqbppqqfffrbfbdfbbqppmtppfttqddtzzwbblqqbddgwgqwqzwwpzwzjjbccdjdwwrggrmrtmrtmrrvpptwwcdcwwsdshhjjhwjwqjwwqsshrrbsblssphspsjpssnsmsqswqwfwjwccdvccrqqnsqnsnwsnsmnmccvcqqfjjfljfljfjgjffjvffvjvhjhfhrfrlrrtpphbhwbbvmmnpndnlljdjfjsffvccnhchwhddrccljllmnnhmnmpnnhtnthnhvnhnwnqqjmmgzzvssphhjljbjwjbwwdnwwdvvzpvvhccvjjlclrrppgjgsshghvvzjvvpvvbjjqhjqqfcqffchcmmvdvtddftdtppfnppcnpnznwwpdpjpnpttlbbmmqfqmffqnfnbffbrbgbwggsmsbbfgbbfbzbtzbbvmmdlmlrlnlwwbswsjjpjhhwqwzqznqzqvvwccwvwwcbbpvvwcvcvzzhzchzccbnccjlljsjbjdbbvqbvvfdfgdfggzfzlzmzrznnqsnncmnnljjtcjcfftrthtrhrgrvvjggzpggrcrpcppggdfggpmmwnmnlmlglvvmjvvddsmsjsnjssqffffctczcjzjjlbbhpbbfdbdzbbsjbjnjbbqqjbqjbjjhwhssmvsschhhwppbjppllprpjrppdpfpgpjptjtptplpnptnptpjjmcmnnnhnjhjlhjlhjlhlwwhwmwjjbhhlfffrbbgvvqwvwswtstmmmfpmfpffmcfcrrqsqzqjjjnpnnztnznddlwdldsdbssstzstswwjtttmmwmsmwssvswszsjzsjjsffmccmfccqzzvpmbbbsqffgzdqbjtzhlqdzhlpwghlstcrcrffrnbwjnqgmbmpgttfmsswdqctlrpdnlsgnlldvbfpwtcptvbwftzcnbbscrrcpnwtmllcvsrmwzzlsdmfctdcwsqdlsnzgfpmzrnswhbqjhstztzzmzpcttsgsggnlhvjmcbbrhgqhsfmglpcbdvmmmnfbtbfrqbpcmttjtnwvznbshwrmznnsvpjqjntlzspljnbwtjcqztsfcqlrggrpzjgjsvqqcrmrjmzwdsshqfhbtfmlwmfvtbcgdmjgtcnphfmfmjlbjzrvjslccftnwcchgdwjnlthlwgldjwqwgdptdjdmzdrrzcdpbfrtdgcspjtqdqvzswwdwrhggdrqjjgwwrbwhhlrpqmszvlvjfqptncjlscvzbgzgmsttlbhbfrctnsphjcrcwlhcgrcrsjbrjvptgfbjgjrvtzmnhpzcgptbmrgvstsltnctjphsjdwpdqblfswzfhgjbpfrptlmhfwcpdlzqccgtdvbzhwngrhlqftmlhjprscflgzpflvvpfsjmlnmbzsrlrshvnsqrhhlqdlzhrcbjjjfrbqcdspwsmltcrtlbdnbnvhbbwgqdcncsztbfwztzdbqgcrnvndmpstpncbwvtctzdpmcpvrgqvjjztfwpvjtdqlvcvdpfzgcghsmbcwtzztmqwdpsprgsmfhphqsqmflrjdqzjscgzlnvcwcrlmpdscnhqpqjfdbdftqgttwntdbpnshdwnmwsrslfgnzlnwwwqgdbfnthhqtvbzsqgzjhhghtmvvfhlmlpbghnsvlttzsjlgndhdqmqqfdlqnbfscsnnqzcdwzdlqcnstcbsffghftqvwrsshgwmlnprhdnnwslwfwtmtfzdjwpmlvvdhjvdwrhvdsmpgrdpnqsjpqmhttrmdwllrmnbznwjwvvpjnnbnfzbdnhjbqqrnzgdqbspbqtwdpgsbwpzfdbpvzfjpsgmztnzrpvvhwlfscfvfpfblvplgdbhvjjpdjtnwrmvpjsphvglpsntvwtqwqvprcgwjltddpjngvmzfzhmqnnwglbzsbrcztpplpsmgmcfgzgpbtgsjrfvdzzcsthznvdpbwvdlcgdhncsjdvpcbbmtrqczctjljdfghsrvrsfjglqqhjttfdhqdqwhzhqrggsjwlldrntwmmbftgqjhpvvctpbtgltnttlhdqbsbwcqmctwlsnhmhncpmnzsllmjhcgnlfgvpcqrwzvsstgwbvjtnrlbblclzdrcwddrwnptqzgwdwtgrfwffpzjmwbqfmmrcfzfzjbwsslbhggtwtcrlhffzgfgrtljgnznnlgzwfmtwwqzhlthvpfclrtmrqfzrggbctzfsmjhrtwzpfrnhwwprnbwmvwvmvnzqpggmzgslctqbqdtvhgzjwzsnblqzmcpnpwllzhvzzmfqzfjlrsrcnjzqdzbpjftljtzvvmrjszvqllnhhgnrnqttnwlvllphjtnmlwqhcvmbsvnwtcdmhsmhdcwqwtvggcqfpdsrsscmhcvfzvdnffrfhdfmgbsghdbpwdwrdmlvsnzwcfchcqvccszdqrbnfvrpbftcwnjmczwgqzmtlmrthlhtjpmchltcmcqwgfgshtvtpmcmpbmlnjmhnpdsljjmjzddnlgtnjqztzsqqlhtqcscjvjncjvfcvsgjhqgzrmtjjcgvvmwswffmlcvlhqhbvrldrvbrfmmqcnqmfzlsghvclrdbsvcbqspgbzmjnlrdhvncnbcfmdlqrssggsmlwwglcjjzmcdwcnrgvvmgjcfbzlncmgqtllgldbdztbtfcjczqtjjlnpqmrgtjsmrbscvqlgqghfbgwccgwrjrzrsbbrqnjcqhllsqmrjtzmjnndwwmdjfhspjpgdcjjpdvwrsgjcfnpllnnnccvnfvqbpddgvbgbsbczmbzrbclczljdmbhpgmhwlqvnjzjwzzfjmsmcchjrqrtmhwlgjsptctlbtdnrqgntcvngcrqdqptfmhbvlhrqchdtwdwbrbqwtswzcrrfndldwmjbczppzrnncvvqsmpvvqcnsvhprhlmrhnjbwdvrbbwwdtmzrqttschrztgjcshlhfbmhmwrrmwgmfshpdhjwgdmcfdvqrmmwgmzbrlgbfltvlzmvqbgvhppdzglqbdlrhjnntnfvtmzjqccmqdbpjqphfggmjqdrndhclcfvqsjrsbcgdhcrbjsdjmwrzvpfpcjwjfdltztfzgmlzqzmztpvbflppgnhdzssznngfjggczdtdmcczjzfsnflpwqrbggmqdbbprfptzcdqvhrvszzjqqjlrlrdpwcnzhvgfhpcdbbgsfmtnszwbhwcdwdghqqctwqlqrlqbdwfvjnhcpmzchqfrwzhzgslzhncmrlrpzcjczvzwcvwcldbmscfqnnqnwwvrpfvjswqmhgmhgnmfzpsjmdhbpvsftccttvdpcdzcnzswqmtrwbctpbgmzrvrrshjjgdqsqrwfpcmsbvqhccvjqpztlttwjjdtbmwslschpqjjllvjcjwtmrtvvwdzglstvtpndmmzcpgqsvqgfdtqdjdctsbsbmqzqhtczhgqgwbdlrhjrwcmtbzfndsbnpnhmsdhtghwwzvtdwtscdnwzmrjrsrjvvbvrpbszchwbltrjbcqmlhqnzcfbhjqnsjghlnlbsrgzrrzfvslwpbqmgfswhgjdsdfrzsdhvdqvqfbcbvmbfhjfpzwlbspcbnvrgpfnmjbwbsnpqpqhjpsnwrlcmfhpdmjbvpnctcfqgdmwzblsnr

rust/6/part1.rs

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+use std::{
+    fs::File,
+    io::{BufReader, Read}, collections::HashSet,
+};
+
+
+fn main() -> () {
+    let input = File::open("input.txt").unwrap();
+    let buf = BufReader::new(input);
+
+    let window_size = 4;
+
+    let mut chars_iter = buf.bytes();
+    let mut window = vec![0u8; 4];
+    let mut dup_check = HashSet::<u8>::with_capacity(4);
+    let mut cursor = window_size - 1;
+    // initialise buffer
+    for i in 0..window_size - 1 {
+        window[i] = chars_iter.next().unwrap().unwrap();
+    }
+    // find non-duplicate window
+    let pos = chars_iter.position(|byte| {
+        let byte = byte.unwrap();
+        window[cursor] = byte;
+        cursor = (cursor + 1) % window_size;
+
+        dup_check.clear();
+        dup_check.extend(window.iter());
+        dup_check.len() == window_size
+    }).unwrap();
+
+    let pos = pos + window_size; // account for buffer initialisation
+
+    println!("{}", pos);
+}

rust/6/part2.rs

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+use std::{
+    fs::File,
+    io::{BufReader, Read}, collections::HashSet,
+};
+
+
+fn main() -> () {
+    let input = File::open("input.txt").unwrap();
+    let buf = BufReader::new(input);
+
+    let window_size = 14; // lmao the ONLY change
+
+    let mut chars_iter = buf.bytes();
+    let mut window = vec![0u8; window_size]; // never mind I had forgotten this bit
+    let mut dup_check = HashSet::<u8>::with_capacity(4);
+    let mut cursor = window_size - 1;
+    // initialise buffer
+    for i in 0..window_size - 1 {
+        window[i] = chars_iter.next().unwrap().unwrap();
+    }
+    // find non-duplicate window
+    let pos = chars_iter.position(|byte| {
+        let byte = byte.unwrap();
+        window[cursor] = byte;
+        cursor = (cursor + 1) % window_size;
+
+        dup_check.clear();
+        dup_check.extend(window.iter());
+        dup_check.len() == window_size
+    }).unwrap();
+
+    let pos = pos + window_size; // account for buffer initialisation
+
+    println!("{}", pos);
+}