WIP: Re-implement using ndarray

This is to have a potentially nicer way to iterate neighbours, as well
as recursive directions.

While the former is neater than it was previously, the latter sadly
wasn't possible after all, and it's very inefficient.

day-11/Cargo.lock

@@ -0,0 +1,141 @@
+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+[[package]]
+name = "autocfg"
+version = "1.0.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "cdb031dd78e28731d87d56cc8ffef4a8f36ca26c38fe2de700543e627f8a464a"
+
+[[package]]
+name = "day-11"
+version = "0.1.0"
+dependencies = [
+ "indoc",
+ "ndarray",
+]
+
+[[package]]
+name = "indoc"
+version = "0.3.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "47741a8bc60fb26eb8d6e0238bbb26d8575ff623fdc97b1a2c00c050b9684ed8"
+dependencies = [
+ "indoc-impl",
+ "proc-macro-hack",
+]
+
+[[package]]
+name = "indoc-impl"
+version = "0.3.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ce046d161f000fffde5f432a0d034d0341dc152643b2598ed5bfce44c4f3a8f0"
+dependencies = [
+ "proc-macro-hack",
+ "proc-macro2",
+ "quote",
+ "syn",
+ "unindent",
+]
+
+[[package]]
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+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "916806ba0031cd542105d916a97c8572e1fa6dd79c9c51e7eb43a09ec2dd84c1"
+dependencies = [
+ "rawpointer",
+]
+
+[[package]]
+name = "ndarray"
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+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "6c0d5c9540a691d153064dc47a4db2504587a75eae07bf1d73f7a596ebc73c04"
+dependencies = [
+ "matrixmultiply",
+ "num-complex",
+ "num-integer",
+ "num-traits",
+ "rawpointer",
+]
+
+[[package]]
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+dependencies = [
+ "num-traits",
+]
+
+[[package]]
+name = "num-integer"
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+checksum = "d2cc698a63b549a70bc047073d2949cce27cd1c7b0a4a862d08a8031bc2801db"
+dependencies = [
+ "autocfg",
+ "num-traits",
+]
+
+[[package]]
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+checksum = "9a64b1ec5cda2586e284722486d802acf1f7dbdc623e2bfc57e65ca1cd099290"
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+ "autocfg",
+]
+
+[[package]]
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+
+[[package]]
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+checksum = "1e0704ee1a7e00d7bb417d0770ea303c1bccbabf0ef1667dae92b5967f5f8a71"
+dependencies = [
+ "unicode-xid",
+]
+
+[[package]]
+name = "quote"
+version = "1.0.7"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "aa563d17ecb180e500da1cfd2b028310ac758de548efdd203e18f283af693f37"
+dependencies = [
+ "proc-macro2",
+]
+
+[[package]]
+name = "rawpointer"
+version = "0.2.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "60a357793950651c4ed0f3f52338f53b2f809f32d83a07f72909fa13e4c6c1e3"
+
+[[package]]
+name = "syn"
+version = "1.0.54"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "9a2af957a63d6bd42255c359c93d9bfdb97076bd3b820897ce55ffbfbf107f44"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "unicode-xid",
+]
+
+[[package]]
+name = "unicode-xid"
+version = "0.2.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f7fe0bb3479651439c9112f72b6c505038574c9fbb575ed1bf3b797fa39dd564"
+
+[[package]]
+name = "unindent"
+version = "0.1.7"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f14ee04d9415b52b3aeab06258a3f07093182b88ba0f9b8d203f211a7a7d41c7"

day-11/Cargo.toml

@@ -0,0 +1,11 @@
+[package]
+name = "day-11"
+version = "0.1.0"
+authors = ["Tristan Daniël Maat <tm@tlater.net>"]
+edition = "2018"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+indoc = "0.3"
+ndarray = "0.14"

day-11/input

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day-11/src/main.rs

@@ -0,0 +1,121 @@
+use std::fs;
+use std::iter;
+
+use ndarray::Array2;
+
+fn main() -> Result<(), Box<dyn std::error::Error>> {
+    let input = fs::read_to_string("input")?;
+    let layout = parse_layout(&input)?;
+
+    // Part 1
+    let result = count_with_neighboring_seats(&layout);
+    println!("{}", result);
+
+    // Part 2
+    let result = count_with_directional_seats(&layout);
+    println!("{}", result);
+
+    Ok(())
+}
+
+type Layout = Array2<Seating>;
+
+#[derive(Copy, Clone, Debug, PartialEq)]
+enum Seating {
+    Occupied,
+    Empty,
+    Floor,
+}
+
+impl Seating {
+    fn new(symbol: char) -> Result<Self, String> {
+        match symbol {
+            '#' => Ok(Seating::Occupied),
+            'L' => Ok(Seating::Empty),
+            '.' => Ok(Seating::Floor),
+            rubbish => Err(format!("Found some rubbish on the floor, area must be clean to conserve human behavior: {}", rubbish))
+        }
+    }
+}
+
+fn parse_layout(input: &str) -> Result<Layout, String> {
+    let (i, j) = (
+        input.lines().count(),
+        input.lines().next().ok_or("Waiting room too small")?.len(),
+    );
+
+    // Padding the input data so that we can later comfortably produce
+    // a convolution
+
+    let grid = input
+        .lines()
+        .flat_map(|line| {
+            iter::once(Ok(Seating::Floor))
+                .chain(line.chars().map(Seating::new))
+                .chain(iter::once(Ok(Seating::Floor)))
+        })
+        .collect::<Result<Vec<Seating>, String>>()?;
+
+    Array2::from_shape_vec((i, j), grid)
+        .map_err(|_| "Non-square waiting rooms don't exist".to_string())
+}
+
+fn count_with_neighboring_seats(layout: &Layout) -> usize {
+    unimplemented!()
+}
+
+fn count_with_directional_seats(layout: &Layout) -> usize {
+    unimplemented!()
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+    use indoc::indoc;
+
+    #[test]
+    fn test_simple() -> Result<(), Box<dyn std::error::Error>> {
+        let input = indoc!(
+            "L.LL.LL.LL
+             LLLLLLL.LL
+             L.L.L..L..
+             LLLL.LL.LL
+             L.LL.LL.LL
+             L.LLLLL.LL
+             ..L.L.....
+             LLLLLLLLLL
+             L.LLLLLL.L
+             L.LLLLL.LL
+            "
+        );
+
+        let layout = parse_layout(&input)?;
+        let result = count_with_neighboring_seats(&layout);
+
+        assert_eq!(result, 37);
+        Ok(())
+    }
+
+    #[test]
+    fn test_simple2() -> Result<(), Box<dyn std::error::Error>> {
+        let input = indoc!(
+            "L.LL.LL.LL
+             LLLLLLL.LL
+             L.L.L..L..
+             LLLL.LL.LL
+             L.LL.LL.LL
+             L.LLLLL.LL
+             ..L.L.....
+             LLLLLLLLLL
+             L.LLLLLL.L
+             L.LLLLL.LL
+            "
+        );
+
+        let layout = parse_layout(&input)?;
+        let result = count_with_directional_seats(&layout);
+
+        assert_eq!(result, 37);
+        Ok(())
+    }
+}

day-14/Cargo.lock

@@ -0,0 +1,144 @@
+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+[[package]]
+name = "aho-corasick"
+version = "0.7.15"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "7404febffaa47dac81aa44dba71523c9d069b1bdc50a77db41195149e17f68e5"
+dependencies = [
+ "memchr",
+]
+
+[[package]]
+name = "day-14"
+version = "0.1.0"
+dependencies = [
+ "indoc",
+ "itertools",
+ "lazy_static",
+ "regex",
+]
+
+[[package]]
+name = "either"
+version = "1.6.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e78d4f1cc4ae33bbfc157ed5d5a5ef3bc29227303d595861deb238fcec4e9457"
+
+[[package]]
+name = "indoc"
+version = "0.3.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "47741a8bc60fb26eb8d6e0238bbb26d8575ff623fdc97b1a2c00c050b9684ed8"
+dependencies = [
+ "indoc-impl",
+ "proc-macro-hack",
+]
+
+[[package]]
+name = "indoc-impl"
+version = "0.3.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ce046d161f000fffde5f432a0d034d0341dc152643b2598ed5bfce44c4f3a8f0"
+dependencies = [
+ "proc-macro-hack",
+ "proc-macro2",
+ "quote",
+ "syn",
+ "unindent",
+]
+
+[[package]]
+name = "itertools"
+version = "0.9.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "284f18f85651fe11e8a991b2adb42cb078325c996ed026d994719efcfca1d54b"
+dependencies = [
+ "either",
+]
+
+[[package]]
+name = "lazy_static"
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+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e2abad23fbc42b3700f2f279844dc832adb2b2eb069b2df918f455c4e18cc646"
+
+[[package]]
+name = "memchr"
+version = "2.3.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "0ee1c47aaa256ecabcaea351eae4a9b01ef39ed810004e298d2511ed284b1525"
+
+[[package]]
+name = "proc-macro-hack"
+version = "0.5.19"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "dbf0c48bc1d91375ae5c3cd81e3722dff1abcf81a30960240640d223f59fe0e5"
+
+[[package]]
+name = "proc-macro2"
+version = "1.0.24"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "1e0704ee1a7e00d7bb417d0770ea303c1bccbabf0ef1667dae92b5967f5f8a71"
+dependencies = [
+ "unicode-xid",
+]
+
+[[package]]
+name = "quote"
+version = "1.0.7"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "aa563d17ecb180e500da1cfd2b028310ac758de548efdd203e18f283af693f37"
+dependencies = [
+ "proc-macro2",
+]
+
+[[package]]
+name = "regex"
+version = "1.4.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "38cf2c13ed4745de91a5eb834e11c00bcc3709e773173b2ce4c56c9fbde04b9c"
+dependencies = [
+ "aho-corasick",
+ "memchr",
+ "regex-syntax",
+ "thread_local",
+]
+
+[[package]]
+name = "regex-syntax"
+version = "0.6.21"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "3b181ba2dcf07aaccad5448e8ead58db5b742cf85dfe035e2227f137a539a189"
+
+[[package]]
+name = "syn"
+version = "1.0.54"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "9a2af957a63d6bd42255c359c93d9bfdb97076bd3b820897ce55ffbfbf107f44"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "unicode-xid",
+]
+
+[[package]]
+name = "thread_local"
+version = "1.0.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "d40c6d1b69745a6ec6fb1ca717914848da4b44ae29d9b3080cbee91d72a69b14"
+dependencies = [
+ "lazy_static",
+]
+
+[[package]]
+name = "unicode-xid"
+version = "0.2.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f7fe0bb3479651439c9112f72b6c505038574c9fbb575ed1bf3b797fa39dd564"
+
+[[package]]
+name = "unindent"
+version = "0.1.7"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f14ee04d9415b52b3aeab06258a3f07093182b88ba0f9b8d203f211a7a7d41c7"

day-14/Cargo.toml

@@ -0,0 +1,13 @@
+[package]
+name = "day-14"
+version = "0.1.0"
+authors = ["Tristan Daniël Maat <tm@tlater.net>"]
+edition = "2018"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+indoc = "0.3"
+itertools = "0.9"
+lazy_static = "1.4"
+regex = "1.4"

day-14/input

@@ -0,0 +1,561 @@
+mask = X011X00011011110001X01010011X0X0X010
+mem[35176] = 9976167
+mem[39031] = 108553
+mem[59131] = 6439623
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+mem[53936] = 331755
+mem[56389] = 2017477
+mask = 101110001111X1X0000011X11X1X01X00001
+mem[115] = 642
+mem[35236] = 21608171
+mem[40102] = 7571
+mask = 0010100X10X01X00010XX0001X1X0X011001
+mem[45336] = 5952410
+mem[22732] = 97085
+mem[13568] = 32642580
+mem[11278] = 991213086
+mem[13552] = 1655255
+mask = 01X0101XX110110101010X1001X0010110X1
+mem[42192] = 4234239
+mem[31473] = 17136584
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+mem[29158] = 116136736
+mask = 0001100X0X1X110X1X00010X0100010X0100
+mem[39435] = 357608510
+mem[14973] = 532464795
+mem[2752] = 64188
+mem[61697] = 11187418
+mem[18575] = 199186
+mem[47723] = 426934
+mem[27423] = 1974772
+mask = 000110000010X10X0X001100X01001X0X1X0
+mem[44107] = 25101
+mem[44194] = 21551
+mem[12030] = 169
+mem[6630] = 12436270
+mask = 0X11XX0111111111110010101110100XX000
+mem[449] = 7072331
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+mem[19455] = 24135
+mem[39633] = 268298
+mask = 0001100101111X01X0X01101X1001001X000
+mem[4608] = 14005
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+mask = 101X100011100X00X10111010X00010X01X0
+mem[42500] = 58188815
+mem[11694] = 11887
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+mem[37274] = 5127
+mem[17385] = 17378063
+mask = 0111110X0X0011X1010X1X110101X1XX0001
+mem[6801] = 243108
+mem[48960] = 4760103
+mem[22732] = 523377
+mask = 00011000001X1X1010000X01110X00X0X001
+mem[4608] = 1170
+mem[30523] = 52724553
+mem[64163] = 19673
+mem[11679] = 12049
+mem[338] = 18404
+mem[36800] = 1073142
+mask = XX101000101010000101001000100X1100X0
+mem[25041] = 33614936
+mem[19637] = 12910
+mem[48777] = 312026612
+mem[3614] = 42590
+mask = 00X0000000X0110001001X11X10001000001
+mem[13162] = 62756298
+mem[14130] = 79824
+mask = 10X100X01X1X1X10000X0X000111X10X0101
+mem[54039] = 155170303
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+mask = 00011X0X01XX1101X000X10110XX0000000X
+mem[14232] = 18518
+mem[4532] = 1320230
+mem[40264] = 68063
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+mask = 011X1X0X011011000000110X0110101X0X00
+mem[13568] = 975118
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+mem[8637] = 3036011
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+mem[28520] = 801207
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+mem[4651] = 9924
+mem[61289] = 2749110
+mem[57251] = 19712904
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+mem[24158] = 8884236
+mem[22515] = 1409
+mem[22964] = 183923110
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+mem[44538] = 874947
+mem[5990] = 363
+mask = 0X11X101011XX111011010X1X0X01101X001
+mem[27091] = 1044
+mem[57617] = 3722045
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+mem[26059] = 13841479
+mem[55461] = 4252699
+mem[56882] = 25286
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+mem[60550] = 1965604
+mem[43412] = 861720
+mask = 1X11000XX1011X100010101X0XX10X1011X0
+mem[54042] = 883549632
+mem[65377] = 94416
+mem[33534] = 13467
+mask = 00111000011111110X01X1XX100101011X11
+mem[21993] = 74
+mem[49628] = 5558
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+mem[36392] = 32630
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+mem[52078] = 214690759
+mem[62049] = 235777
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+mem[49729] = 23532
+mem[3769] = 475930259
+mem[50832] = 7539691
+mask = 01011X01010011111X00111111X111000X01
+mem[47391] = 294107389
+mem[41571] = 33636200
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+mask = 011110101110X10X01XX11110X1100110010
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+mem[29723] = 382196268
+mask = 0X1X10X0X11011000X00111100X1001X0X00
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+mask = X001100001X00101X000010101011010100X
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+mask = X0101000011011000X0X001111011X100101
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+mem[42040] = 243356019
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+mem[28563] = 1986
+mem[39009] = 628217
+mask = 01X11X01010011X100101X010000101101X1
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+mem[41317] = 2850662
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+mem[26815] = 6522802
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+mem[56904] = 2521022
+mask = XXX111XX1110X10101001X01001111000XX1
+mem[56039] = 13855
+mem[48222] = 13842
+mem[57251] = 110043295
+mem[896] = 7181
+mem[64594] = 3483
+mask = 00011X000X1011001000011111XX00100010
+mem[41571] = 63539
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+mask = 001010011010X1001XX00000X1000110011X
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+mask = 1011X00011X11X1000X011100X0111000X01
+mem[50450] = 627875
+mem[64553] = 99
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+mem[11413] = 60359360
+mask = 0010X0X0XX101100010X001111X1X1110001
+mem[37311] = 436389854
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+mem[32818] = 1561170
+mem[61100] = 144227
+mask = 0111110X011X11X10100111XX00XX101XX01
+mem[51399] = 1972
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+mem[41416] = 936
+mem[12700] = 246505
+mem[57540] = 2923524
+mem[8321] = 70934934
+mask = 0X11X0000110010000001001XX0000110X10
+mem[21546] = 912416315
+mem[29145] = 99559
+mem[16528] = 29459665
+mem[13846] = 6110601
+mem[6104] = 13330
+mem[62308] = 31534
+mem[64601] = 494
+mask = 0001X1X101101X0X1X00X101101X1011010X
+mem[35524] = 261536
+mem[39801] = 310749971
+mem[46522] = 1236
+mem[4129] = 1844
+mem[6315] = 6569
+mem[32886] = 168
+mem[42248] = 11892434
+mask = 1XX11001110X000010000X00000X00100001
+mem[34337] = 3847
+mem[8390] = 8155520
+mem[62768] = 5218234
+mem[29841] = 249705
+mask = 01011101X10X1111000011X1101XX1110101
+mem[40491] = 11567
+mem[29057] = 5710533
+mem[7221] = 1098
+mem[57270] = 997670442
+mask = 001010X100101X00X00001XX01X000011010
+mem[54373] = 3875
+mem[41275] = 111847
+mem[15151] = 45571
+mem[22776] = 8162199
+mask = X01110X0111XXX0000001X11111110000X01
+mem[106] = 5774051
+mem[41573] = 7822355
+mask = 001110X0011X01X00X0X110X0X0000010X1X
+mem[39101] = 17209596
+mem[57877] = 216131041
+mem[63978] = 643398
+mem[10351] = 15285
+mem[35863] = 23302872
+mask = 001010X011101100010001X0100101X0000X
+mem[20499] = 211562966
+mem[46546] = 1635565
+mem[45815] = 18600505
+mem[65441] = 25793
+mem[48867] = 4021120
+mask = X11010001110X10001X011X001001X1100XX
+mem[49457] = 476570
+mem[26669] = 4266538
+mem[50839] = 9507231
+mem[54766] = 1208643
+mem[49279] = 2607329
+mem[20912] = 1119428
+mask = 00X111X011X0110100000001001001001X10
+mem[3981] = 28411
+mem[1880] = 357278
+mem[31243] = 162
+mask = 00011100X1X0X101000X000110XXX1011000
+mem[26881] = 21252
+mem[10018] = 6965635
+mem[47777] = 33385526
+mem[46651] = 214034
+mem[42585] = 40702649
+mem[55569] = 20351
+mem[23923] = 253114336
+mask = 00XX100000101100X00X1110111XX00101X0
+mem[29597] = 1149
+mem[21886] = 38689097
+mem[37141] = 700
+mem[19653] = 273424
+mem[50472] = 7691440
+mask = XX111X10X111X10001X001X1X1011011X011
+mem[8566] = 25451836
+mem[39771] = 4721485
+mem[44687] = 6594426
+mem[42570] = 361
+mem[14627] = 64772285
+mem[48337] = 1264
+mask = X010X0011101001010X0111X000111X000XX
+mem[54859] = 36075224
+mem[61289] = 1247
+mem[31793] = 19842184
+mem[15612] = 404768
+mask = 10110X01110X1X1000100X1X00100011110X
+mem[41092] = 29758
+mem[58134] = 1780
+mem[30647] = 865419
+mem[46184] = 133
+mask = 0XX1110101X011X1XXX00011X0X011010001
+mem[52020] = 14383756
+mem[64473] = 2371708
+mem[53688] = 3645018
+mem[62848] = 112067628
+mem[25377] = 5361
+mem[40061] = 584
+mem[57896] = 4809281
+mask = 0001X1X10X1X1X001X00001X1X0000100100
+mem[50150] = 1695
+mem[58420] = 95104341
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+mem[29926] = 1556
+mem[28188] = 165994572
+mem[44315] = 2054
+mask = 0111X0001110X100X000X11111011110000X
+mem[40090] = 53578
+mem[61376] = 125798
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+mem[64504] = 60087919
+mem[29083] = 165056
+mask = 00X110000110X10X000000X1X0000010X00X
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+mask = 0111X1XX1110XX0100001011X010X0111010
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+mem[46385] = 30062259
+mem[39435] = 6225
+mask = 00111110111001X0X1XX1X0X10X11X010011
+mem[60773] = 4068534
+mem[46727] = 88487
+mem[45335] = 2899
+mem[55714] = 3991
+mask = 01X11X0010111111X11X11X0100001010001
+mem[50543] = 70
+mem[28563] = 17930
+mem[14417] = 107070185
+mem[19810] = 530758
+mem[26195] = 352915721
+mem[23620] = 541394
+mem[51609] = 68738
+mask = 1010100X01X01X0000X01X1X11001XX01101
+mem[30706] = 33489
+mem[3614] = 97141
+mem[47530] = 61588428
+mem[54451] = 37
+mem[17417] = 3467253
+mask = 0XX0X10X00X0XX001X0010100X1000100101
+mem[61965] = 25976999
+mem[52290] = 83693474
+mem[10104] = 172902064
+mask = 10101001X100110000X0X111110X11111X10
+mem[51399] = 42079173
+mem[10104] = 60
+mem[42192] = 761948
+mask = 01111X1X111001010XX01111X1111101X011
+mem[15002] = 5761
+mem[57522] = 781049282
+mem[58771] = 36590
+mem[50845] = 895780041
+mask = 1110100X1110X10001X011X0100X1X11XX0X
+mem[28451] = 29180808
+mem[49154] = 106361
+mem[19472] = 962416
+mask = X001X1XX011010001X00X1111010X011100X
+mem[472] = 20077
+mem[44685] = 88446
+mem[46048] = 3015039
+mem[61697] = 1680
+mem[65441] = 420953
+mask = 010111X0001XX100010001101X0000001011
+mem[7230] = 105401132
+mem[37903] = 49164
+mem[2407] = 15927
+mem[62905] = 2466
+mem[6996] = 275026478
+mask = 0010X0X0111011000X00101X010000101100
+mem[20747] = 130064892
+mem[227] = 14848571
+mask = 1X101X0011100100X10X11000XX00XX0010X
+mem[18075] = 4105
+mem[7692] = 10369
+mem[34480] = 70016
+mem[54747] = 178664159
+mem[31770] = 4308718
+mem[25940] = 286972
+mask = 1X1X100011110X10X000X00XX01001000001
+mem[18927] = 433001153
+mem[56004] = 381
+mem[7713] = 560209289
+mem[55758] = 1791814
+mem[12953] = 174435
+mem[40556] = 1415
+mask = X01X101001110XX00001000X10000X010000
+mem[62126] = 15628
+mem[53714] = 392410
+mem[49154] = 13065
+mask = 001X1000X0X010XX01X0X000X1000000X100
+mem[8723] = 64433454
+mem[6757] = 1682978
+mem[60483] = 13735
+mask = 01011X01011XX1111X001X110000X01100XX
+mem[64013] = 806538
+mem[51273] = 32346
+mask = 00X11101011011010110101X0011110XX001
+mem[55121] = 416007913
+mem[44077] = 5865583
+mem[64585] = 323728
+mask = 101X100X11X100X01000100X01000X100001
+mem[60817] = 42192
+mem[6757] = 4925545
+mem[33281] = 6862960
+mem[21115] = 11608810
+mask = XXX0X11000101X010100X010101X10001000
+mem[42505] = 6795
+mem[27245] = 671587340
+mem[43412] = 8741321
+mem[2793] = 1114109
+mem[34194] = 2767551
+mask = 0X111X0001111101010010001001XX1X1110
+mem[21794] = 1041902
+mem[22992] = 3666
+mem[63730] = 46469539
+mask = 000110X10X001101X00X011110X011010001
+mem[6617] = 22675825
+mem[9131] = 24859225
+mask = 001X1X0XX010X10010001X0001000010XX10
+mem[28267] = 491581202
+mem[7622] = 154622
+mem[49279] = 1164052
+mem[6361] = 62173
+mem[29823] = 6599915
+mask = 01X0XX1X0X10110101001010101XX11X1000
+mem[50472] = 5878
+mem[3981] = 896
+mem[39714] = 74
+mem[6898] = 1993
+mem[8193] = 487
+mask = 0001X100111011X000000110X00X01000000
+mem[25162] = 323406673
+mem[43610] = 647412
+mem[54042] = 811029198
+mem[13461] = 33008731
+mem[17432] = 766541
+mem[45290] = 167819285
+mask = 00110X000110010000XXX111011101010010
+mem[10481] = 1969
+mem[61056] = 100302708
+mem[62768] = 97484359
+mask = 0X0XX100001X11XX0100010010X001001X10
+mem[11117] = 90479
+mem[51399] = 5088
+mem[65489] = 273
+mem[29185] = 9519
+mem[46096] = 669
+mask = 01111X0XXX111X11X1X01010100X01X00001
+mem[6256] = 8901226
+mem[38934] = 11506
+mem[4000] = 49916408
+mem[31753] = 7960142
+mem[61777] = 22041
+mask = X11110001110110X000X011100X00XX00001
+mem[37652] = 309890
+mem[4955] = 6491368
+mask = 0X1X110000X00X001000011000100110X011
+mem[35882] = 20171
+mem[14041] = 542
+mem[973] = 33148060
+mem[61056] = 2230
+mem[30545] = 2890
+mem[48094] = 745799437
+mask = 1011000011X1111000X0X1XX11X1X10X0101
+mem[61322] = 765242
+mem[6315] = 7001612
+mem[11278] = 12973
+mem[59259] = 2040
+mem[46184] = 498
+mask = X01X10101X1X0100000X10101011X110X011
+mem[1103] = 6682
+mem[49066] = 528792283
+mem[42040] = 222766

day-14/src/main.rs

@@ -0,0 +1,162 @@
+use std::collections::HashMap;
+use std::fs;
+
+use itertools::Itertools;
+use lazy_static::lazy_static;
+use regex::Regex;
+
+const MASK_36_BITS: u64 = 0xFFFFFFFFF;
+
+fn main() -> Result<(), Box<dyn std::error::Error>> {
+    let input = fs::read_to_string("input")?;
+    let program = parse_program(&input)?;
+
+    // Part 1
+    let memory = run_program_chip1(&program);
+    println!("{}", memory.iter().map(|(_, value)| value).sum::<u64>());
+
+    // Part 2
+    let memory = run_program_chip2(&program);
+    println!("{}", memory.iter().map(|(_, value)| value).sum::<u64>());
+
+    Ok(())
+}
+
+#[derive(Copy, Clone, Debug)]
+enum Instruction {
+    Mask(u64, u64, u64),
+    Mem(u64, u64),
+}
+
+impl Instruction {
+    fn new(instruction: &str) -> Result<Self, String> {
+        lazy_static! {
+            static ref INSTRUCTION_RE: Regex =
+                Regex::new(r"([[:alpha:]]+?)\[?(\d+?)?\]? = ([0-9X]+)")
+                    .expect("Regex should compile");
+        }
+
+        let caps = INSTRUCTION_RE
+            .captures(instruction)
+            .ok_or("Instruction did not match")?;
+
+        Ok(match &caps[1] {
+            "mask" => {
+                let and = u64::from_str_radix(&caps[3].replace("X", "1"), 2)
+                    .map_err(|e| format!("Could not parse and: {}", e))?;
+                let or = u64::from_str_radix(&caps[3].replace("X", "0"), 2)
+                    .map_err(|e| format!("Could not parse or: {}", e))?;
+
+                Instruction::Mask(and, or, and ^ or)
+            }
+            "mem" => {
+                let location = caps[2]
+                    .parse()
+                    .map_err(|e| format!("Could not parse location: {}", e))?;
+                let value = caps[3]
+                    .parse()
+                    .map_err(|e| format!("Could not parse value: {}", e))?;
+
+                Instruction::Mem(location, value)
+            }
+            _ => Err("Invalid instruction")?,
+        })
+    }
+}
+
+fn parse_program(input: &str) -> Result<Vec<Instruction>, String> {
+    input.lines().map(Instruction::new).collect()
+}
+
+fn run_program_chip1(program: &Vec<Instruction>) -> Vec<(u64, u64)> {
+    let mut mask = (u64::max_value() & MASK_36_BITS, 0);
+
+    program
+        .iter()
+        .filter_map(|instruction| match instruction {
+            Instruction::Mask(and, or, _) => {
+                mask = (*and, *or);
+                None
+            }
+            Instruction::Mem(address, value) => Some((*address as u64, value & mask.0 | mask.1)),
+        })
+        .collect::<Vec<(u64, u64)>>()
+        .into_iter()
+        .rev()
+        .unique_by(|address| address.0)
+        .collect()
+}
+
+fn run_program_chip2(program: &Vec<Instruction>) -> Vec<(u64, u64)> {
+    let mut memory = HashMap::new();
+    let mut mask = (0, 0);
+
+    for instruction in program {
+        match instruction {
+            Instruction::Mask(_, or, floating) => {
+                mask = (*or, *floating);
+            }
+            Instruction::Mem(address, value) => {
+                // We set floating bits to 0 here, so that they can be
+                // toggled with addition
+                let base = (address | mask.0) & !mask.1 & MASK_36_BITS;
+
+                let mut floating = !mask.1 & MASK_36_BITS;
+                while floating <= MASK_36_BITS {
+                    // For each unset bit in the floating mask, we
+                    // toggle the bit in the address
+                    memory.insert(base | (!floating & MASK_36_BITS), *value);
+                    floating += 1;
+
+                    // Since add does overflows, we reset 1s to 0s if
+                    // they're unset in the original mask
+                    floating |= !mask.1 & MASK_36_BITS;
+                }
+            }
+        }
+    }
+
+    memory.drain().collect()
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+    use indoc::indoc;
+
+    #[test]
+    fn test_simple() -> Result<(), Box<dyn std::error::Error>> {
+        let input = indoc!(
+            "
+             mask = XXXXXXXXXXXXXXXXXXXXXXXXXXXXX1XXXX0X
+             mem[8] = 11
+             mem[7] = 101
+             mem[8] = 0
+            "
+        );
+
+        let program = parse_program(input)?;
+        let memory = run_program_chip1(&program);
+
+        assert_eq!(memory.iter().map(|(_, value)| value).sum::<u64>(), 165);
+        Ok(())
+    }
+
+    #[test]
+    fn test_simple2() -> Result<(), Box<dyn std::error::Error>> {
+        let input = indoc!(
+            "
+             mask = 000000000000000000000000000000X1001X
+             mem[42] = 100
+             mask = 00000000000000000000000000000000X0XX
+             mem[26] = 1
+            "
+        );
+
+        let program = parse_program(input)?;
+        let memory = dbg!(run_program_chip2(&program));
+
+        assert_eq!(memory.iter().map(|(_, value)| value).sum::<u64>(), 208);
+        Ok(())
+    }
+}

day-15/Cargo.lock

@@ -0,0 +1,78 @@
+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+[[package]]
+name = "day-15"
+version = "0.1.0"
+dependencies = [
+ "indoc",
+]
+
+[[package]]
+name = "indoc"
+version = "0.3.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "47741a8bc60fb26eb8d6e0238bbb26d8575ff623fdc97b1a2c00c050b9684ed8"
+dependencies = [
+ "indoc-impl",
+ "proc-macro-hack",
+]
+
+[[package]]
+name = "indoc-impl"
+version = "0.3.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ce046d161f000fffde5f432a0d034d0341dc152643b2598ed5bfce44c4f3a8f0"
+dependencies = [
+ "proc-macro-hack",
+ "proc-macro2",
+ "quote",
+ "syn",
+ "unindent",
+]
+
+[[package]]
+name = "proc-macro-hack"
+version = "0.5.19"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "dbf0c48bc1d91375ae5c3cd81e3722dff1abcf81a30960240640d223f59fe0e5"
+
+[[package]]
+name = "proc-macro2"
+version = "1.0.24"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "1e0704ee1a7e00d7bb417d0770ea303c1bccbabf0ef1667dae92b5967f5f8a71"
+dependencies = [
+ "unicode-xid",
+]
+
+[[package]]
+name = "quote"
+version = "1.0.7"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "aa563d17ecb180e500da1cfd2b028310ac758de548efdd203e18f283af693f37"
+dependencies = [
+ "proc-macro2",
+]
+
+[[package]]
+name = "syn"
+version = "1.0.54"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "9a2af957a63d6bd42255c359c93d9bfdb97076bd3b820897ce55ffbfbf107f44"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "unicode-xid",
+]
+
+[[package]]
+name = "unicode-xid"
+version = "0.2.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f7fe0bb3479651439c9112f72b6c505038574c9fbb575ed1bf3b797fa39dd564"
+
+[[package]]
+name = "unindent"
+version = "0.1.7"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f14ee04d9415b52b3aeab06258a3f07093182b88ba0f9b8d203f211a7a7d41c7"

day-15/Cargo.toml

@@ -0,0 +1,10 @@
+[package]
+name = "day-15"
+version = "0.1.0"
+authors = ["Tristan Daniël Maat <tm@tlater.net>"]
+edition = "2018"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+indoc = "0.3"

day-15/src/main.rs

@@ -0,0 +1,121 @@
+use std::collections::HashMap;
+
+fn main() -> Result<(), Box<dyn std::error::Error>> {
+    // Part 1
+    let numbers = parse_numbers("1,20,11,6,12,0")?;
+    let result = play(&numbers, 2020);
+    println!("{}", result);
+
+    // Part 2
+    let numbers = parse_numbers("1,20,11,6,12,0")?;
+    let result = play(&numbers, 30000000);
+    println!("{}", result);
+
+    Ok(())
+}
+
+fn parse_numbers(input: &str) -> Result<Vec<u32>, std::num::ParseIntError> {
+    input.split(',').map(|number| number.parse()).collect()
+}
+
+fn play(numbers: &Vec<u32>, turns: usize) -> u32 {
+    let mut said = HashMap::new();
+    for (turn, number) in numbers.iter().enumerate() {
+        said.insert(*number, (turn + 1, 0));
+    }
+    let mut last = *numbers.last().expect("Must have at least one number");
+
+    for turn in numbers.len()..turns {
+        match said.get(&last) {
+            Some((_, 0)) | None => {
+                last = 0;
+
+                let entry = said.entry(last).or_insert((0, 0));
+                *entry = (turn + 1, entry.0);
+            }
+            Some((last_turn, last_last_turn)) => {
+                last = (last_turn - last_last_turn) as u32;
+
+                let entry = said.entry(last).or_insert((0, 0));
+                *entry = (turn + 1, entry.0);
+            }
+        };
+    }
+
+    last
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn test_simple() -> Result<(), Box<dyn std::error::Error>> {
+        let input = "0,3,6";
+        let numbers = parse_numbers(input)?;
+        let result = play(&numbers, 2020);
+
+        assert_eq!(result, 436);
+        Ok(())
+    }
+
+    #[test]
+    fn test_simple0() -> Result<(), Box<dyn std::error::Error>> {
+        let input = "1,3,2";
+        let numbers = parse_numbers(input)?;
+        let result = play(&numbers, 2020);
+
+        assert_eq!(result, 1);
+        Ok(())
+    }
+
+    #[test]
+    fn test_simple1() -> Result<(), Box<dyn std::error::Error>> {
+        let input = "2,1,3";
+        let numbers = parse_numbers(input)?;
+        let result = play(&numbers, 2020);
+
+        assert_eq!(result, 10);
+        Ok(())
+    }
+
+    #[test]
+    fn test_simple2() -> Result<(), Box<dyn std::error::Error>> {
+        let input = "1,2,3";
+        let numbers = parse_numbers(input)?;
+        let result = play(&numbers, 2020);
+
+        assert_eq!(result, 27);
+        Ok(())
+    }
+
+    #[test]
+    fn test_simple3() -> Result<(), Box<dyn std::error::Error>> {
+        let input = "2,3,1";
+        let numbers = parse_numbers(input)?;
+        let result = play(&numbers, 2020);
+
+        assert_eq!(result, 78);
+        Ok(())
+    }
+
+    #[test]
+    fn test_simple4() -> Result<(), Box<dyn std::error::Error>> {
+        let input = "3,2,1";
+        let numbers = parse_numbers(input)?;
+        let result = play(&numbers, 2020);
+
+        assert_eq!(result, 438);
+        Ok(())
+    }
+
+    #[test]
+    fn test_simple5() -> Result<(), Box<dyn std::error::Error>> {
+        let input = "3,1,2";
+        let numbers = parse_numbers(input)?;
+        let result = play(&numbers, 2020);
+
+        assert_eq!(result, 1836);
+        Ok(())
+    }
+}