From 585d3537ed50602ae706be1ed9b7bb59a4a98976 Mon Sep 17 00:00:00 2001
From: Thomas Schmucker <ts@its1.de>
Date: Wed, 11 Dec 2024 12:40:13 +0100
Subject: aoc 2024, day 11, part 1

---
 2024/src/day11.cpp | 45 +++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 45 insertions(+)
 create mode 100644 2024/src/day11.cpp

(limited to '2024/src')

diff --git a/2024/src/day11.cpp b/2024/src/day11.cpp
new file mode 100644
index 0000000..f31e30b
--- /dev/null
+++ b/2024/src/day11.cpp
@@ -0,0 +1,45 @@
+#include <fstream>
+#include <iostream>
+#include <iterator>
+#include <vector>
+using namespace std;
+
+vector<long>
+read_file(string_view filename)
+{
+	fstream input{ filename };
+	return { istream_iterator<long>{ input }, {} };
+}
+
+void
+part1(vector<long> data)
+{
+	for ( size_t i = 0; i != 25; ++i ) {
+		vector<long> temp;
+		for ( const auto value: data ) {
+			if ( value == 0 ) {
+				temp.push_back(1);
+				continue;
+			}
+
+			auto str = to_string(value);
+			if ( str.size() % 2 == 0 ) {
+				auto len = str.size() / 2;
+				temp.push_back(stol(str.substr(0, len)));
+				temp.push_back(stol(str.substr(len)));
+				continue;
+			}
+
+			temp.push_back(value * 2024);
+		}
+		data.swap(temp);
+	}
+	cout << data.size() << endl;
+}
+
+int
+main()
+{
+	auto data = read_file("data/day11.txt");
+	part1(data);
+}
-- 
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