From 56e890cec0a28c0a485212ccebfaf774235a79a2 Mon Sep 17 00:00:00 2001
From: Thomas Schmucker <ts@its1.de>
Date: Wed, 3 Jan 2024 23:35:54 +0100
Subject: prepare for more puzzles ... :)

---
 2023/src/day02.cpp | 100 +++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 100 insertions(+)
 create mode 100644 2023/src/day02.cpp

(limited to '2023/src/day02.cpp')

diff --git a/2023/src/day02.cpp b/2023/src/day02.cpp
new file mode 100644
index 0000000..aa3d5a2
--- /dev/null
+++ b/2023/src/day02.cpp
@@ -0,0 +1,100 @@
+#include <cctype>
+#include <cstdio>
+#include <fstream>
+#include <iostream>
+#include <map>
+#include <sstream>
+#include <string>
+#include <vector>
+using namespace std;
+
+vector<string>
+split(const string& line, char sep)
+{
+	vector<string> parts;
+	stringstream   input{ line };
+
+	for ( string part; getline(input, part, sep); ) {
+		parts.emplace_back(part);
+	}
+
+	return parts;
+}
+
+void
+part1()
+{
+	fstream input{ "data/day02.txt" };
+
+	auto sum = 0;
+	for ( string line; getline(input, line); ) {
+		auto game = split(line, ':');
+
+		auto gameId = 0;
+		sscanf(game[0].data(), "Game %d", &gameId); // NOLINT
+
+		auto subsets = split(game[1], ';');
+
+		auto fail = false;
+
+		for ( const auto& subset: subsets ) {
+			auto cubes = split(subset, ',');
+
+			map<string, int> counts{};
+
+			for ( const auto& cube: cubes ) {
+				auto data = split(cube, ' ');
+
+				auto count = stoi(data[1]);
+				auto color = data[2];
+
+				counts[color] += count;
+			}
+
+			fail |= (counts["red"] > 12) || (counts["green"] > 13) || (counts["blue"] > 14); // NOLINT
+		}
+
+		if ( !fail ) {
+			sum += gameId;
+		}
+	}
+	cout << sum << endl;
+}
+
+void
+part2()
+{
+	fstream input{ "data/day02.txt" };
+
+	auto sum = 0;
+
+	for ( string line; getline(input, line); ) {
+		auto game = split(line, ':');
+
+		auto subsets = split(game[1], ';');
+
+		map<string, int> colors{};
+
+		for ( const auto& subset: subsets ) {
+			auto cubes = split(subset, ',');
+
+			for ( const auto& cube: cubes ) {
+				auto data = split(cube, ' ');
+
+				auto count = stoi(data[1]);
+				auto color = data[2];
+
+				colors[color] = max(colors[color], count);
+			}
+		}
+		sum += colors["red"] * colors["green"] * colors["blue"];
+	}
+	cout << sum << endl;
+}
+
+int
+main()
+{
+	part1();
+	part2();
+}
-- 
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