Lets use include_str! this year

day01/src/main.rs

@@ -1,20 +1,16 @@
-use std::fs::File;
-use std::io::prelude::*;
-use std::io::BufReader;
 use std::time::Instant;
 
 use anyhow::Result;
 
-const INPUT: &str = "input/input.txt";
+const INPUT: &str = include_str!("input/input.txt");
 
-fn solve_part1(input_path: &str) -> Result<i32> {
-    let file = File::open(input_path)?;
-    let reader = BufReader::new(file);
+fn solve_part1(input: &str) -> Result<i32> {
+    let lines = input.trim().lines();
 
     let mut increases = 0;
     let mut prev_reading: Option<i32> = None;
-    for line in reader.lines() {
-        let reading = line?.parse()?;
+    for line in lines {
+        let reading = line.parse()?;
         if let Some(prev) = prev_reading {
             if reading > prev {
                 increases += 1;
@@ -26,17 +22,13 @@ fn solve_part1(input_path: &str) -> Result<i32> {
     Ok(increases)
 }
 
-fn solve_part2(input_path: &str) -> Result<i32> {
-    let file = File::open(input_path)?;
-    let reader = BufReader::new(file);
+fn solve_part2(input: &str) -> Result<i32> {
+    let lines: Vec<&str> = input.trim().lines().collect();
 
     let mut increases = 0;
     let mut prev_sum: Option<i32> = None;
-    let all_lines = reader
-        .lines()
-        .collect::<Result<Vec<String>, std::io::Error>>()?;
-    for lines in all_lines.windows(3) {
-        let sum = lines.iter().map(|s| s.parse::<i32>().unwrap()).sum();
+    for group in lines.windows(3) {
+        let sum = group.iter().map(|s| s.parse::<i32>().unwrap()).sum();
         if let Some(prev) = prev_sum {
             if sum > prev {
                 increases += 1;
@@ -62,7 +54,7 @@ fn main() {
 mod tests {
     use super::*;
 
-    const TEST_INPUT: &str = "input/test.txt";
+    const TEST_INPUT: &str = include_str!("input/test.txt");
 
     #[test]
     fn solves_part1() {