From 2a9dd4c3f2d16cd4976738e5bdce29b4f4dc31d5 Mon Sep 17 00:00:00 2001
From: Greg Burri <greg.burri@gmail.com>
Date: Mon, 9 Dec 2024 15:59:38 +0100
Subject: [PATCH] Add one comment :D

---
 src/day09.rs | 7 ++-----
 1 file changed, 2 insertions(+), 5 deletions(-)

diff --git a/src/day09.rs b/src/day09.rs
index 8ad49bb..eac0b8c 100644
--- a/src/day09.rs
+++ b/src/day09.rs
@@ -69,7 +69,7 @@ pub fn defrag_v2(mut memory: Vec<u32>) -> Vec<u32> {
     let mut files: Vec<MemoryChunk> = Vec::new();
 
     let mut pos = 0;
-    loop {
+    while pos < memory.len() {
         let start = pos;
         let v = memory[start];
         pos += 1;
@@ -87,14 +87,11 @@ pub fn defrag_v2(mut memory: Vec<u32>) -> Vec<u32> {
         } else {
             files.push(chunk);
         }
-
-        if pos == memory.len() {
-            break;
-        }
     }
 
     for f in files.iter().rev() {
         for free_space in free_spaces.iter_mut() {
+            // Files are only move backward.
             if free_space.pos >= f.pos {
                 break;
             }
-- 
2.45.2