Initial commit and day 1

.github/workflows/rust.yml

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+name: Rust
+
+on:
+  push:
+    branches: [ main ]
+  pull_request:
+    branches: [ main ]
+
+env:
+  CARGO_TERM_COLOR: always
+
+jobs:
+  build:
+
+    runs-on: ubuntu-latest
+
+    steps:
+    - uses: actions/checkout@v2
+    - name: Build
+      run: cargo build --verbose
+    - name: Run tests
+      run: cargo test --verbose

.gitignore

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+**/target

Cargo.lock

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+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+[[package]]
+name = "advent-of-code-2017"
+version = "0.1.0"

Cargo.toml

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+[package]
+name = "advent-of-code-2017"
+version = "0.1.0"
+authors = ["Smaug123 <patrick+github@patrickstevens.co.uk>"]
+edition = "2018"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]

day_1/Cargo.lock

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+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+[[package]]
+name = "day_1"
+version = "0.1.0"

day_1/Cargo.toml

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+[package]
+name = "day_1"
+version = "0.1.0"
+authors = ["Smaug123 <patrick+github@patrickstevens.co.uk>"]
+edition = "2018"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]

day_1/input.txt

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+77736991856689225253142335214746294932318813454849177823468674346512426482777696993348135287531487622845155339235443718798255411492778415157351753377959586612882455464736285648473397681163729345143319577258292849619491486748832944425643737899293811819448271546283914592546989275992844383947572926628695617661344293284789225493932487897149244685921644561896799491668147588536732985476538413354195246785378443492137893161362862587297219368699689318441563683292683855151652394244688119527728613756153348584975372656877565662527436152551476175644428333449297581939357656843784849965764796365272113837436618857363585783813291999774718355479485961244782148994281845717611589612672436243788252212252489833952785291284935439662751339273847424621193587955284885915987692812313251556836958571335334281322495251889724281863765636441971178795365413267178792118544937392522893132283573129821178591214594778712292228515169348771198167462495988252456944269678515277886142827218825358561772588377998394984947946121983115158951297156321289231481348126998584455974277123213413359859659339792627742476688827577318285573236187838749444212666293172899385531383551142896847178342163129883523694183388123567744916752899386265368245342587281521723872555392212596227684414269667696229995976182762587281829533181925696289733325513618571116199419759821597197636415243789757789129824537812428338192536462468554399548893532588928486825398895911533744671691387494516395641555683144968644717265849634943691721391779987198764147667349266877149238695714118982841721323853294642175381514347345237721288281254828745122878268792661867994785585131534136646954347165597315643658739688567246339618795777125767432162928257331951255792438831957359141651634491912746875748363394329848227391812251812842263277229514125426682179711184717737714178235995431465217547759282779499842892993556918977773236196185348965713241211365895519697294982523166196268941976859987925578945185217127344619169353395993198368185217391883839449331638641744279836858188235296951745922667612379649453277174224722894599153367373494255388826855322712652812127873536473277

day_1/src/lib.rs

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+fn input() -> Vec<u32> {
+    let input = include_str!("../input.txt");
+    input
+        .trim()
+        .chars()
+        .map(|l| l.to_digit(10).expect(&format!("{} wasn't a valid u32", l)))
+        .collect::<Vec<u32>>()
+}
+
+pub fn part_1(numbers: &[u32]) -> u32 {
+    let mut sum = 0;
+    let mut previous = numbers[0];
+    let len = numbers.len();
+    for i in 1..len {
+        if numbers[i] == previous {
+            sum += previous;
+        }
+        previous = numbers[i];
+    }
+    if len > 1 {
+        if previous == numbers[0] {
+            sum += previous;
+        }
+    }
+
+    sum
+}
+
+pub fn part_2(numbers: &[u32]) -> u32 {
+    let mut sum = 0;
+    let len = numbers.len();
+    for i in 0..len / 2 {
+        if numbers[i] == numbers[len / 2 + i] {
+            sum += 2 * numbers[i];
+        }
+    }
+
+    sum
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn part1_known() {
+        assert_eq!(part_1(&[1, 1, 2, 2]), 3);
+        assert_eq!(part_1(&[1, 1, 1, 1]), 4);
+        assert_eq!(part_1(&[1, 2, 3, 4]), 0);
+        assert_eq!(part_1(&[9, 1, 2, 1, 2, 1, 2, 9]), 9);
+    }
+
+    #[test]
+    fn part2_known() {
+        assert_eq!(part_2(&[1, 2, 1, 2]), 6);
+        assert_eq!(part_2(&[1, 2, 2, 1]), 0);
+        assert_eq!(part_2(&[1, 2, 3, 4, 2, 5]), 4);
+        assert_eq!(part_2(&[1, 2, 3, 1, 2, 3]), 12);
+        assert_eq!(part_2(&[1, 2, 1, 3, 1, 4, 1, 5]), 4);
+    }
+
+    #[test]
+    fn test_day_1() {
+        let input = input();
+        assert_eq!(part_1(&input), 1223);
+        assert_eq!(part_2(&input), 1284);
+    }
+}

src/main.rs

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+fn main() {
+    println!("Hello, world!");
+}