Day 1 Part 1

day_1/hint1.txt

@@ -0,0 +1,6 @@
+3   4
+4   3
+2   5
+1   3
+3   9
+3   3

day_1/part1.rs

@@ -0,0 +1,36 @@
+use std::fs::File;
+use std::io::{self, BufRead};
+use std::path::Path;
+use std::env;
+
+fn read_lines<P>(filename: P) -> io::Result<io::Lines<io::BufReader<File>>>
+where P: AsRef<Path>, {
+    let file = File::open(filename)?;
+    Ok(io::BufReader::new(file).lines())
+}
+
+fn main() {
+    let mut left_list: Vec<i32> = vec![];
+    let mut right_list: Vec<i32> = vec![];
+
+    let args: Vec<_> = env::args().collect();
+
+    if let Ok(lines) = read_lines(args[1].clone()) {
+        for line in lines.flatten() {
+            let parts = line.split("   ").collect::<Vec<_>>();
+            let lnum = parts[0].parse::<i32>().unwrap();
+            let rnum = parts[1].parse::<i32>().unwrap();
+            left_list.push(lnum);
+            right_list.push(rnum);
+        }
+        left_list.sort();
+        right_list.sort();
+        let mut sum = 0;
+        for (i, left_n) in left_list.iter().enumerate() {
+            let right_n = right_list[i];
+            println!("{} {} {}", i, left_n, right_n);
+            sum += (left_n - right_n).abs();
+        }
+        println!("{}", sum);
+    }
+}