From 756f22d58bb198b8f34589c112e1003614ccdcd6 Mon Sep 17 00:00:00 2001
From: Thomas Schmucker <ts@its1.de>
Date: Sun, 2 Nov 2025 21:41:58 +0100
Subject: aoc 2017, days 1-20

---
 2017/src/day05.cpp | 57 ++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 57 insertions(+)
 create mode 100644 2017/src/day05.cpp

(limited to '2017/src/day05.cpp')

diff --git a/2017/src/day05.cpp b/2017/src/day05.cpp
new file mode 100644
index 0000000..93656b6
--- /dev/null
+++ b/2017/src/day05.cpp
@@ -0,0 +1,57 @@
+#include <filesystem>
+#include <fstream>
+#include <iostream>
+
+using namespace std;
+
+namespace {
+
+vector<int>
+read_lines(const filesystem::path& filename)
+{
+	ifstream    file{ filename };
+	vector<int> lines;
+
+	for ( int value{}; file >> value; ) {
+		lines.emplace_back(value);
+	}
+
+	return lines;
+}
+
+void
+part1(vector<int> values)
+{
+	int steps = 0;
+	for ( size_t ip = 0; ip < values.size(); ) {
+		auto offset = values[ip]++;
+		ip += static_cast<size_t>(offset);
+		++steps;
+	}
+
+	cout << "Part1: " << steps << '\n';
+}
+
+void
+part2(vector<int> values)
+{
+	int steps = 0;
+	for ( size_t ip = 0; ip < values.size(); ) {
+		auto offset = values[ip];
+		values[ip] += (offset >= 3) ? -1 : 1;
+		ip += static_cast<size_t>(offset);
+		++steps;
+	}
+
+	cout << "Part2: " << steps << '\n';
+}
+
+} // namespace
+
+int
+main()
+{
+	auto values = read_lines("data/day05.txt");
+	part1(values);
+	part2(values);
+}
-- 
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