day_9: fixed marginal case and validated

README.md

@@ -11,7 +11,7 @@ https://adventofcode.com/2024
 | 06 | Guard Gallivant | :pushpin: | :pushpin: | 2D navigation |
 | 07 | Bridge Repair | :pushpin: | :pushpin: | Equation parsing |
 | 08 | Resonant Collinearity | :pushpin: |  | Matrix exploration |
-| 09 | Disk fragmenter |  |  | |
+| 09 | Disk fragmenter | :pushpin: |  | Array indexing |
 | 10 |  |  |  | |
 | 11 |  |  |  | |
 | 12 |  |  |  | |

src/advent_of_code/mon_09.rs

@@ -1,14 +1,10 @@
 use super::{utils::read_disk_map_input, DiskChecksum, DiskMap};
 
-// Last result: 6349343813585
-
 pub fn disk_fragmenter(input: &str) -> DiskChecksum {
     let disk_map = read_disk_map_input(input);
 
     let organized_disk_map = organize_disk_map(disk_map);
 
-    println!("Organized map: {:?}", organized_disk_map);
-
     calc_disk_check_sum(&organized_disk_map)
 }
 
@@ -18,20 +14,16 @@ pub fn organize_disk_map(mut disk_map: DiskMap) -> DiskMap {
 
     'outer: loop {
         if end_index <= start_index || start_index > disk_map.len() - 1 {
-            println!(
-                "Broke out of outer: {} {} with len {}",
-                start_index,
-                end_index,
-                disk_map.len()
-            );
             break 'outer;
         }
 
         if let None = disk_map[start_index] {
             'inner: loop {
+                if end_index <= start_index {
+                    break 'inner;
+                }
                 if let Some(_) = disk_map[end_index] {
                     disk_map.swap(start_index, end_index);
-                    end_index -= 1;
                     break 'inner;
                 }
                 end_index -= 1;

src/advent_of_code/utils.rs

@@ -170,7 +170,8 @@ pub fn read_disk_map_input(input: &str) -> DiskMap {
 
     let mut id: usize = 0;
     for (digit_index, char_digit) in raw_map.chars().enumerate() {
-        if let Some(digit) = char_digit.to_digit(10u32) {
+        if let Some(digit) = char_digit.to_digit(10) {
+            if digit > 0 {
                 for _ in 0..digit {
                     if digit_index % 2 == 0 {
                         disk_map.push(Some(id));
@@ -183,6 +184,7 @@ pub fn read_disk_map_input(input: &str) -> DiskMap {
                 }
             }
         }
+    }
 
     disk_map
 }