From 9a1f073f8e33e8b0d6c97332f51161683cfc6e58 Mon Sep 17 00:00:00 2001
From: Sebastiano Tronto <sebastiano@tronto.net>
Date: Mon, 9 Dec 2024 14:06:37 +0100
Subject: Day 9 with views::reverse

---
 2024/09/day09a.cpp | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

(limited to '2024/09/day09a.cpp')

diff --git a/2024/09/day09a.cpp b/2024/09/day09a.cpp
index c52c8f0..80732d7 100644
--- a/2024/09/day09a.cpp
+++ b/2024/09/day09a.cpp
@@ -1,6 +1,7 @@
 #include <algorithm>
 #include <iostream>
 #include <map>
+#include <ranges>
 #include <set>
 #include <sstream>
 #include <string>
@@ -16,11 +17,11 @@ int main() {
 			a.push_back(id % 2 == 0 ? id/2 : -1); // -1 = space
 
 	int j = 0;
-	for (int i = a.size()-1; i >= 0; i--) {
+	for (auto& x : a | views::reverse) {
 		while (a[j] >= 0) j++;
 		if (a[j] == -2) break;
-		a[j] = a[i];
-		a[i] = -2; // -2 = freed up
+		a[j] = x;
+		x = -2; // -2 = freed up
 	}
 
 	long long checksum = 0;
-- 
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