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 ... :)

---
 src/day04.cpp | 114 ----------------------------------------------------------
 1 file changed, 114 deletions(-)
 delete mode 100644 src/day04.cpp

(limited to 'src/day04.cpp')

diff --git a/src/day04.cpp b/src/day04.cpp
deleted file mode 100644
index 0d3e552..0000000
--- a/src/day04.cpp
+++ /dev/null
@@ -1,114 +0,0 @@
-#include <fstream>
-#include <iostream>
-#include <set>
-#include <sstream>
-#include <string>
-#include <string_view>
-#include <vector>
-
-using namespace std;
-
-vector<string>
-read_file(string_view filename)
-{
-	fstream        input{ filename };
-	vector<string> data;
-
-	for ( string line; getline(input, line); ) {
-		data.emplace_back(line);
-	}
-
-	return data;
-}
-
-vector<string>
-split(const string& line, char sep)
-{
-	stringstream   input{ line };
-	vector<string> parts;
-
-	for ( string part; getline(input, part, sep); ) {
-		parts.emplace_back(part);
-	}
-
-	return parts;
-}
-
-template<typename Container>
-Container
-read_ints(const string& line)
-{
-	Container    container{};
-	stringstream input{ line };
-
-	for ( typename Container::value_type value; input >> value; ) {
-		container.emplace(value);
-	}
-
-	return container;
-}
-
-auto
-build_data_set(string_view filename)
-{
-	vector<unsigned long> values;
-
-	for ( const auto& line: read_file(filename) ) {
-		const auto cards   = split(line, ':');
-		const auto numbers = split(cards[1], '|');
-
-		const auto winning_numbers = read_ints<set<int>>(numbers[0]);
-		const auto card_numbers    = read_ints<set<int>>(numbers[1]);
-
-		auto count = 0U;
-		for ( auto number: winning_numbers ) {
-			if ( card_numbers.contains(number) ) {
-				++count;
-			}
-		}
-		values.emplace_back(count);
-	}
-
-	return values;
-}
-
-void
-pass1(const vector<unsigned long>& values)
-{
-	auto sum = 0U;
-	for ( auto value: values ) {
-		if ( value != 0 ) {
-			sum += (1U << (value - 1));
-		}
-	}
-
-	cout << sum << endl;
-}
-
-void
-pass2(const vector<unsigned long>& values)
-{
-	auto count = 0U;
-
-	function<void(size_t, size_t)> process = [&](size_t start, size_t end) -> void {
-		for ( ; start != end; ++start ) {
-			auto value = values[start];
-
-			++count;
-
-			process(start + 1, start + value + 1);
-		}
-	};
-
-	process(0, values.size());
-
-	cout << count << endl;
-}
-
-int
-main()
-{
-	const auto values = build_data_set("data/day04.txt");
-	pass1(values);
-	pass2(values);
-}
-- 
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