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/day06.cpp | 74 ++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 74 insertions(+)
 create mode 100644 2023/src/day06.cpp

(limited to '2023/src/day06.cpp')

diff --git a/2023/src/day06.cpp b/2023/src/day06.cpp
new file mode 100644
index 0000000..9a429c5
--- /dev/null
+++ b/2023/src/day06.cpp
@@ -0,0 +1,74 @@
+#include <cstdint>
+#include <fstream>
+#include <iostream>
+#include <numeric>
+#include <sstream>
+#include <vector>
+using namespace std;
+
+template<typename T = long>
+vector<T>
+read_ints(const string& line)
+{
+	stringstream iss{ line };
+	return vector<T>{ istream_iterator<T>{ iss }, istream_iterator<T>{} };
+}
+
+long
+solve(long time, long winningDistance)
+{
+	long counter = 0;
+	for ( long pushTime = 0; pushTime < time; ++pushTime ) {
+		auto distance = (time * pushTime - pushTime * pushTime);
+		counter += long(distance > winningDistance);
+	}
+	return counter;
+}
+
+void
+part1()
+{
+	fstream input{ "data/day06.txt" };
+	string  line;
+
+	getline(input, line);
+	auto times = read_ints(line.substr(line.find(':') + 1));
+
+	getline(input, line);
+	auto distances = read_ints(line.substr(line.find(':') + 1));
+
+	long result = 1;
+	for ( size_t idx = 0; idx != times.size(); ++idx ) {
+		result *= solve(times[idx], distances[idx]);
+	}
+	cout << result << endl;
+}
+
+string
+join(const string& line)
+{
+	stringstream iss{ line };
+	return accumulate(istream_iterator<string>{ iss }, istream_iterator<string>{}, string{});
+}
+
+void
+part2()
+{
+	fstream input{ "data/day06.txt" };
+	string  line;
+
+	getline(input, line);
+	auto time = stol(join(line.substr(line.find(':') + 1)));
+
+	getline(input, line);
+	auto distance = stol(join(line.substr(line.find(':') + 1)));
+
+	cout << solve(time, distance) << endl;
+}
+
+int
+main()
+{
+	part1();
+	part2();
+}
-- 
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