From a84c3e49f5193560178d35b7b79cef4f5823f190 Mon Sep 17 00:00:00 2001
From: Sijmen Schoon <me@sijmenschoon.nl>
Date: Tue, 15 Dec 2020 22:41:56 +0100
Subject: [PATCH] Rust: small optimization for day9 part1

---
 rust/src/main.rs | 12 +++++-------
 1 file changed, 5 insertions(+), 7 deletions(-)

diff --git a/rust/src/main.rs b/rust/src/main.rs
index 726019e..76276e2 100644
--- a/rust/src/main.rs
+++ b/rust/src/main.rs
@@ -381,19 +381,16 @@ mod day09 {
     use std::time::{Duration, Instant};
 
     fn part1(numbers: &[usize]) -> usize {
-        for (i, &n) in numbers.iter().enumerate().skip(COUNT) {
-            let mut found = false;
+        'outer: for (i, &n) in numbers.iter().enumerate().skip(COUNT) {
             for x in i - COUNT..i {
                 for y in x + 1..i {
                     if numbers[x] + numbers[y] == n {
-                        found = true;
+                        continue 'outer;
                     }
                 }
             }
 
-            if !found {
-                return n;
-            }
+            return n;
         }
 
         panic!();
@@ -416,7 +413,8 @@ mod day09 {
             }
         }
 
-        numbers[lower..upper].iter().min().unwrap() + numbers[lower..upper].iter().max().unwrap()
+        let slice = &numbers[lower..upper];
+        slice.iter().min().unwrap() + slice.iter().max().unwrap()
     }
 
     const COUNT: usize = 25;