From 4073f69c841994067e67d8b9aafb5d32ae7ec6df Mon Sep 17 00:00:00 2001
From: Ishan Jain <contact@ishanjain.me>
Date: Wed, 7 Dec 2022 17:52:55 +0530
Subject: [PATCH] Optimized integer parsing in day 7 part 2

---
 .gitignore  | 2 +-
 src/main.rs | 6 ++++--
 2 files changed, 5 insertions(+), 3 deletions(-)

diff --git a/.gitignore b/.gitignore
index 913a1e0..dc7cec3 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,5 +1,5 @@
 /target
 go.mod
 go.sum
-test.go
+*.go
 test
diff --git a/src/main.rs b/src/main.rs
index 45368ba..eb062b8 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -48,8 +48,10 @@ fn solution(input: impl Iterator<Item = &'static str>) -> u32 {
             },
 
             _ => {
-                let (size, _) = line.split_once(' ').unwrap();
-                let size = size.parse::<u32>().unwrap();
+                let size = line
+                    .bytes()
+                    .take_while(|&c| c != b' ')
+                    .fold(0u32, |a, x| a * 10 + (x - b'0') as u32);
                 current_folder_size += size;
             }
         }