Added day 20 code for part 1 and 2

Signed-off-by: Louis Vallat <louis@louis-vallat.xyz>

.gitlab-ci.yml

@@ -98,3 +98,8 @@ day-19:
   stage: build
   script:
     - cd day19; cargo run --release ./input
+
+day-20:
+  stage: build
+  script:
+    - cd day20; cargo run --release ./input

day20/Cargo.toml

@@ -0,0 +1,8 @@
+[package]
+name = "day20"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]

day20/input

@@ -0,0 +1,102 @@
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day20/src/main.rs

@@ -0,0 +1,94 @@
+use std::{fs, env, collections::HashSet};
+
+#[derive(Debug)]
+struct Image {
+    pub h: usize,
+    pub w: usize,
+    pub i: HashSet<(usize, usize)>
+}
+
+fn read_input(path: &str) -> String {
+    return fs::read_to_string(path).expect("Cannot read file.");
+}
+
+fn parse_input(s: &str) -> (HashSet<usize>, Image) {
+    let mut e = HashSet::new();
+    let mut p = HashSet::new();
+    let mut r = 0;
+
+    for l in s.lines() {
+        if e.is_empty() {
+            for (i, c) in l.chars().enumerate() {
+                if c == '#' { e.insert(i); }
+            }
+        } else if !l.is_empty() {
+            for (i, c) in l.chars().enumerate() {
+                if c == '#' { p.insert((r, i)); }
+            }
+            r += 1;
+        }
+    }
+
+    let c = get_min_max_coord(&p);
+    return (e, Image { h: c.0.1, w: c.1.1, i: p });
+}
+
+fn get_min_max_coord(p: &HashSet<(usize, usize)>) -> ((usize, usize), (usize, usize)) {
+    let (mut lh, mut uh, mut lw, mut uw) = (usize::MAX, usize::MIN, usize::MAX, usize::MIN);
+
+    for i in p.iter() {
+        lh = std::cmp::min(lh, i.0);
+        uh = std::cmp::max(uh, i.0);
+        lw = std::cmp::min(lw, i.1);
+        uw = std::cmp::max(uw, i.1);
+    }
+
+    return ((lh, uh), (lw, uw));
+}
+
+fn shift_image_for_safety(i: &mut Image, s: usize) {
+    let mut h = HashSet::new();
+    for e in i.i.clone() {
+        h.insert((e.0 + s, e.1 + s));
+    }
+    i.h += s * 2;
+    i.w += s * 2;
+    i.i = h;
+}
+
+fn enhance_image(i: &mut Image, a: &HashSet<usize>) {
+    let mut e = HashSet::new();
+    for r in 1..i.h {
+        for c in 1..i.w {
+            let mut z = 0;
+            for y in (r - 1) as i32..=(r + 1) as i32 {
+                for x in (c - 1) as i32..=(c + 1) as i32 {
+                    z <<= 1;
+                    if i.i.contains(&(y as usize, x as usize)) { z += 1; }
+                }
+            }
+            if a.contains(&z) { e.insert((r, c)); }
+        }
+    }
+    i.i = e;
+    i.h -= 1;
+    i.w -= 1;
+}
+
+fn main() {
+    let args: Vec<String> = env::args().collect();
+    for arg in args.iter().skip(1) {
+        let input = read_input(&arg);
+        let mut vec_in = parse_input(&input);
+        shift_image_for_safety(&mut vec_in.1, 100);
+        let mut p1 = 0;
+        for i in 0..50 {
+            if i == 2 { p1 = vec_in.1.i.len(); }
+            enhance_image(&mut vec_in.1, &vec_in.0);
+        }
+        println!("[{}]", &arg);
+        println!("\t[Part 1] => Answer is '{}'.", p1);
+        println!("\t[Part 2] => Answer is '{}'.", vec_in.1.i.len());
+    }
+}
+