From f0638b6cef379829127dc352a227b3d43ba383cc Mon Sep 17 00:00:00 2001
From: Thomas Schmucker <ts@its1.de>
Date: Mon, 11 Nov 2024 12:40:07 +0100
Subject: day 10, part 1, aoc 2022

---
 2022/src/day10.cpp | 44 ++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 44 insertions(+)
 create mode 100644 2022/src/day10.cpp

(limited to '2022/src/day10.cpp')

diff --git a/2022/src/day10.cpp b/2022/src/day10.cpp
new file mode 100644
index 0000000..76c953c
--- /dev/null
+++ b/2022/src/day10.cpp
@@ -0,0 +1,44 @@
+#include <fstream>
+#include <iostream>
+#include <string>
+#include <vector>
+using namespace std;
+
+vector<int>
+read_file(string_view filename)
+{
+	fstream     input{ filename };
+	vector<int> cycles{};
+	int         reg_x = 1;
+
+	static const string add_instr = "addx ";
+
+	for ( string line; getline(input, line); ) {
+		cycles.emplace_back(reg_x);
+
+		if ( line.starts_with(add_instr) ) {
+			cycles.emplace_back(reg_x);
+			reg_x += stoi(line.substr(add_instr.size()));
+		}
+	}
+	cycles.emplace_back(reg_x);
+
+	return cycles;
+}
+
+void
+part1(const vector<int>& cycles)
+{
+	int sum = 0;
+	for ( size_t cycle = 19; cycle < cycles.size(); cycle += 40 ) {
+		sum += static_cast<int>(cycle + 1) * cycles[cycle];
+	}
+	cout << sum << endl;
+}
+
+int
+main()
+{
+	const auto cycles = read_file("data/day10.txt");
+	part1(cycles);
+}
-- 
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