beginning of days 4 and 5

day5/rust/Cargo.toml

@@ -0,0 +1,9 @@
+[package]
+name = "rust"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+itertools = "0.10"

day5/rust/src/main.rs

@@ -0,0 +1,34 @@
+use itertools::Itertools;
+use std::collections::HashMap;
+use std::fs;
+
+fn main() {
+    let input = fs::read_to_string("../input.txt").expect("Could not read file");
+
+    let lines = input
+        .lines()
+        .filter_map(|l| {
+            l.split(" -> ")
+                .map(|s| s.split(','))
+                .flatten()
+                .map(|i| i.parse::<i8>().unwrap())
+                .collect_tuple()
+        })
+        .collect::<Vec<(i8, i8, i8, i8)>>();
+
+    let mut points = HashMap::new();
+
+    for (x1, y1, x2, y2) in lines {
+        let dx: i8 = x2 - x1;
+        let dy: i8 = y2 - y1;
+        for x in x1..x1 + dx {
+            for y in y1..y1 + dy {
+                *points.entry((x, y)).or_insert(0) += 1;
+            }
+        }
+    }
+
+    for (key, value) in points.into_iter() {
+        println!("({}, {}), {}", key.0, key.1, value);
+    }
+}