From 7f5d8635cce6851459151b8cd086c334fc508781 Mon Sep 17 00:00:00 2001
From: Burnus <github@burnus.net>
Date: Sun, 3 Dec 2023 22:37:53 +0100
Subject: [PATCH] Bugfix for 2023 day 03: Handle number in very last position
 correctly

---
 2023/day03_gear_ratios/src/lib.rs         | 9 +++++++--
 2023/day03_gear_ratios/tests/sample_input | 6 +++---
 2 files changed, 10 insertions(+), 5 deletions(-)

diff --git a/2023/day03_gear_ratios/src/lib.rs b/2023/day03_gear_ratios/src/lib.rs
index 5972409..7e14839 100644
--- a/2023/day03_gear_ratios/src/lib.rs
+++ b/2023/day03_gear_ratios/src/lib.rs
@@ -16,7 +16,7 @@ fn find_part_numbers(input: &str) -> (Vec<usize>, Vec<usize>) {
         }
     }
     let mut cur_num = 0;
-    for (line_idx, line) in input.lines().enumerate() {
+    for (line_idx, line) in input.lines().chain("\n".lines()).enumerate() {
         if cur_num > 0 {
             let digits = (1_u32..).find(|d| 10_usize.pow(*d) > cur_num).unwrap() as usize;
             let mut is_part = false;
@@ -89,10 +89,15 @@ mod tests {
         read_to_string(name).expect(&format!("Unable to read file: {name}")[..]).trim().to_string()
     }
 
+    #[test]
+    fn empty_str() {
+        assert_eq!(run(""), (0, 0))
+    }
+
     #[test]
     fn test_sample() {
         let sample_input = read_file("tests/sample_input");
-        assert_eq!(run(&sample_input), (4361, 467835));
+        assert_eq!(run(&sample_input), (4364, 467835));
     }
 
     #[test]
diff --git a/2023/day03_gear_ratios/tests/sample_input b/2023/day03_gear_ratios/tests/sample_input
index b20187f..22158d1 100644
--- a/2023/day03_gear_ratios/tests/sample_input
+++ b/2023/day03_gear_ratios/tests/sample_input
@@ -5,6 +5,6 @@
 617*......
 .....+.58.
 ..592.....
-......755.
-...$.*....
-.664.598..
+......755.1
+...$.*...*
+.664.598.2