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/day02.cpp | 71 ++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 71 insertions(+)
 create mode 100644 2017/src/day02.cpp

(limited to '2017/src/day02.cpp')

diff --git a/2017/src/day02.cpp b/2017/src/day02.cpp
new file mode 100644
index 0000000..5f965bd
--- /dev/null
+++ b/2017/src/day02.cpp
@@ -0,0 +1,71 @@
+#include <algorithm>
+#include <filesystem>
+#include <fstream>
+#include <iostream>
+#include <sstream>
+#include <string>
+#include <vector>
+
+using namespace std;
+
+namespace {
+
+vector<vector<int>>
+read_file(const filesystem::path& filename)
+{
+	ifstream            file{ filename };
+	vector<vector<int>> grid;
+
+	for ( string line; getline(file, line); ) {
+		stringstream strm{ line };
+
+		vector<int> row;
+
+		for ( int value{}; strm >> value; ) {
+			row.emplace_back(value);
+		}
+
+		grid.emplace_back(row);
+	}
+
+	return grid;
+}
+
+void
+part1(const vector<vector<int>>& grid)
+{
+	int checksum = 0;
+	for ( const auto& row: grid ) {
+		auto [min, max] = ranges::minmax_element(row);
+		checksum += *max - *min;
+	}
+	cout << "Part1: " << checksum << '\n';
+}
+
+void
+part2(const vector<vector<int>>& grid)
+{
+	int checksum = 0;
+	for ( auto row: grid ) {
+		ranges::sort(row, ranges::greater());
+
+		for ( auto it = row.begin(); it != row.end(); ++it ) {
+			for ( auto it2 = next(it); it2 != row.end(); ++it2 ) {
+				if ( *it % *it2 == 0 ) {
+					checksum += *it / *it2;
+				}
+			}
+		}
+	}
+	cout << "Part2: " << checksum << '\n';
+}
+
+} // namespace
+
+int
+main()
+{
+	auto grid = read_file("data/day02.txt");
+	part1(grid);
+	part2(grid);
+}
-- 
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