WIP: Re-implement using ndarray

Re-implement day 11.1 with graphs
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.
2020-12-15 20:39:25 +00:00 · 2020-12-15 20:39:20 +00:00 · 2020-12-15 20:39:17 +00:00 · 2020-12-15 20:33:16 +00:00 · 2020-12-15 18:55:49 +00:00
11 changed files with 1455 additions and 0 deletions
--- a/day-11/Cargo.lock
+++ b/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]]
+name = "matrixmultiply"
+version = "0.2.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "916806ba0031cd542105d916a97c8572e1fa6dd79c9c51e7eb43a09ec2dd84c1"
+dependencies = [
+ "rawpointer",
+]
+
+[[package]]
+name = "ndarray"
+version = "0.14.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "6c0d5c9540a691d153064dc47a4db2504587a75eae07bf1d73f7a596ebc73c04"
+dependencies = [
+ "matrixmultiply",
+ "num-complex",
+ "num-integer",
+ "num-traits",
+ "rawpointer",
+]
+
+[[package]]
+name = "num-complex"
+version = "0.3.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "747d632c0c558b87dbabbe6a82f3b4ae03720d0646ac5b7b4dae89394be5f2c5"
+dependencies = [
+ "num-traits",
+]
+
+[[package]]
+name = "num-integer"
+version = "0.1.44"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "d2cc698a63b549a70bc047073d2949cce27cd1c7b0a4a862d08a8031bc2801db"
+dependencies = [
+ "autocfg",
+ "num-traits",
+]
+
+[[package]]
+name = "num-traits"
+version = "0.2.14"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "9a64b1ec5cda2586e284722486d802acf1f7dbdc623e2bfc57e65ca1cd099290"
+dependencies = [
+ "autocfg",
+]
+
+[[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 = "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"
--- a/day-11/Cargo.toml
+++ b/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"
--- a/day-11/input
+++ b/day-11/input
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--- a/day-11/src/main.rs
+++ b/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(())
+    }
+}
--- a/day-14/Cargo.lock
+++ b/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"
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+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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+checksum = "e2abad23fbc42b3700f2f279844dc832adb2b2eb069b2df918f455c4e18cc646"
+
+[[package]]
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+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "0ee1c47aaa256ecabcaea351eae4a9b01ef39ed810004e298d2511ed284b1525"
+
+[[package]]
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+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "dbf0c48bc1d91375ae5c3cd81e3722dff1abcf81a30960240640d223f59fe0e5"
+
+[[package]]
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+checksum = "1e0704ee1a7e00d7bb417d0770ea303c1bccbabf0ef1667dae92b5967f5f8a71"
+dependencies = [
+ "unicode-xid",
+]
+
+[[package]]
+name = "quote"
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+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"
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+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"
--- a/day-14/Cargo.toml
+++ b/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"
--- a/day-14/input
+++ b/day-14/input
@ -0,0 +1,561 @@
+mask = X011X00011011110001X01010011X0X0X010
+mem[35176] = 9976167
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+mem[13552] = 1655255
+mask = 01X0101XX110110101010X1001X0010110X1
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+mask = 0X11X0000110010000001001XX0000110X10
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+mem[62308] = 31534
+mem[64601] = 494
+mask = 0001X1X101101X0X1X00X101101X1011010X
+mem[35524] = 261536
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+mask = 1XX11001110X000010000X00000X00100001
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+mask = 01011101X10X1111000011X1101XX1110101
+mem[40491] = 11567
+mem[29057] = 5710533
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+mem[57270] = 997670442
+mask = 001010X100101X00X00001XX01X000011010
+mem[54373] = 3875
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+mem[106] = 5774051
+mem[41573] = 7822355
+mask = 001110X0011X01X00X0X110X0X0000010X1X
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+mask = 001010X011101100010001X0100101X0000X
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+mask = X11010001110X10001X011X001001X1100XX
+mem[49457] = 476570
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+mask = 00XX100000101100X00X1110111XX00101X0
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+mask = XX111X10X111X10001X001X1X1011011X011
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+mask = X010X0011101001010X0111X000111X000XX
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+mem[29083] = 165056
+mask = 00X110000110X10X000000X1X0000010X00X
+mem[63634] = 156131519
+mem[63499] = 37794
+mem[54660] = 213384
+mem[19357] = 291569507
+mem[11793] = 44425775
+mem[1569] = 1499
+mask = 0111X1XX1110XX0100001011X010X0111010
+mem[17747] = 687783
+mem[47527] = 43313
+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
--- a/day-14/src/main.rs
+++ b/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(())
+    }
+}
--- a/day-15/Cargo.lock
+++ b/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"
--- a/day-15/Cargo.toml
+++ b/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"
--- a/day-15/src/main.rs
+++ b/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(())
+    }
+}
Author	SHA1	Message	Date
Tristan Daniël Maat	f38ec71c3f	WIP: Re-implement using ndarray	2020-12-15 20:39:25 +00:00
Tristan Daniël Maat	5a7cd20ca6	Re-implement day 11.1 with graphs 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.	2020-12-15 20:39:20 +00:00
Tristan Daniël Maat	74819475ca	Complete day 11.1	2020-12-15 20:39:17 +00:00
Tristan Daniël Maat	2f48b0e912	Complete day 14	2020-12-15 20:33:16 +00:00
Tristan Daniël Maat	a0e76a9949	Complete day 15	2020-12-15 18:55:49 +00:00