day 1 part 1 in rust

.gitignore

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+target
+*.out
+Cargo.lock
+input.txt

day_01/Cargo.toml

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+[package]
+name = "day_01"
+version = "0.1.0"
+edition = "2021"
+
+[dependencies]

day_01/src/main.rs

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+fn main() {
+    let input = include_str!("../input.txt");
+    let mut left: Vec<u32> = Vec::new();
+    let mut right: Vec<u32> = Vec::new();
+    let count = input.lines().count();
+    for line in input.lines() {
+        let (l, r) = line.split_once("   ").unwrap();
+        left.push(l.parse().unwrap());
+        right.push(r.parse().unwrap());
+    }
+    let mut sum: u32 = 0;
+    for _ in 0..count {
+        let (il, minl) = smallest(&left);
+        let (ir, minr) = smallest(&right);
+        sum += if minl > minr {
+            minl - minr
+        } else {
+            minr - minl
+        };
+        left.swap_remove(il);
+        right.swap_remove(ir);
+    }
+    println!("{sum}");
+}
+
+fn smallest(source: &[u32]) -> (usize, u32) {
+    let mut min = 99999;
+    let mut min_index = 0;
+    for (i, &n) in source.iter().enumerate() {
+        if n < min {
+            min = n;
+            min_index = i;
+        }
+    }
+    (min_index, min)
+}