From dd4e61032468f6a7cca682185ccc303dbb47dc3f Mon Sep 17 00:00:00 2001
From: Antoine Martin <antoine97.martin@gmail.com>
Date: Sun, 1 Dec 2019 16:36:46 +0100
Subject: [PATCH] 2019: day01: improve sub overflow handling

---
 aoc2019/src/day01.rs | 5 +----
 1 file changed, 1 insertion(+), 4 deletions(-)

diff --git a/aoc2019/src/day01.rs b/aoc2019/src/day01.rs
index a79dbf1..f196c11 100644
--- a/aoc2019/src/day01.rs
+++ b/aoc2019/src/day01.rs
@@ -10,10 +10,7 @@ pub fn run() -> Result<()> {
 }
 
 fn fuel_needed(module_weight: u64) -> u64 {
-    match (module_weight / 3).checked_sub(2) {
-        Some(f) => f,
-        None => 0,
-    }
+    (module_weight / 3).saturating_sub(2)
 }
 
 fn part1(input: &str) -> Result<u64> {