day one

day-1/src/main.rs

@@ -0,0 +1,36 @@
+use std::fs;
+
+/// it 'appends' to a Vec and acts like a sorting 'algo'
+fn algo_append(v: &mut Vec<i32>, i: i32) {
+    if let Some(pos) = v.iter().position(|&x| x > i) {
+        v.insert(pos, i);
+    } else {
+        v.push(i);
+    }
+}
+
+fn solution(s: &str) {
+    let mut left: Vec<i32> = Vec::new();
+    let mut right: Vec<i32> = Vec::new();
+    // let mut disc: Vec<u32> = Vec::new();
+    let mut total = 0;
+    for id_line in s.split('\n') {
+        let id = id_line.split("   ").collect::<Vec<&str>>();
+        let l_dis = id[0].parse::<i32>().unwrap();
+        let r_dis = id[1].parse::<i32>().unwrap();
+        algo_append(&mut left, l_dis);
+        algo_append(&mut right, r_dis);
+    }
+
+    for i in 0..left.len() {
+        total += left[i].abs_diff(right[i]);
+    }
+
+    println!("{total}")
+}
+
+fn main() {
+    let s = fs::read_to_string("locs.txt").unwrap();
+
+    solution(&s);
+}