From 899b3da016b0060164a4afb36738d920888ac0da Mon Sep 17 00:00:00 2001
From: Thomas Schmucker <ts@its1.de>
Date: Mon, 11 Nov 2024 19:34:50 +0100
Subject: aoc 2015, day02

---
 2015/src/day02.cpp | 57 ++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 57 insertions(+)
 create mode 100644 2015/src/day02.cpp

(limited to '2015/src')

diff --git a/2015/src/day02.cpp b/2015/src/day02.cpp
new file mode 100644
index 0000000..a2d54df
--- /dev/null
+++ b/2015/src/day02.cpp
@@ -0,0 +1,57 @@
+#include <fstream>
+#include <iostream>
+#include <string>
+#include <tuple>
+#include <vector>
+
+using namespace std;
+
+auto
+read_file(string_view filename)
+{
+	fstream                      input{ filename };
+	vector<tuple<int, int, int>> puzzle;
+	for ( string line; getline(input, line); ) {
+		int w, h, l;
+		if ( sscanf(line.c_str(), "%dx%dx%d", &w, &h, &l) == 3 ) {
+			puzzle.emplace_back(w, h, l);
+		}
+	}
+	return puzzle;
+}
+
+void
+part1(const vector<tuple<int, int, int>>& puzzle)
+{
+	int sum = 0;
+	for ( const auto& [w, h, l]: puzzle ) {
+		auto side1 = l * w;
+		auto side2 = w * h;
+		auto side3 = h * l;
+
+		sum += 2 * side1 + 2 * side2 + 2 * side3 + min({ side1, side2, side3 });
+	}
+	cout << sum << endl;
+}
+
+void
+part2(const vector<tuple<int, int, int>>& puzzle)
+{
+	int sum = 0;
+	for ( const auto& [w, h, l]: puzzle ) {
+		auto side1 = 2 * l;
+		auto side2 = 2 * w;
+		auto side3 = 2 * h;
+
+		sum += side1 + side2 + side3 - max({ side1, side2, side3 }) + l * w * h;
+	}
+	cout << sum << endl;
+}
+
+int
+main()
+{
+	auto puzzle = read_file("data/day02.txt");
+	part1(puzzle);
+	part2(puzzle);
+}
-- 
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