From 4b6c1b0e539d9fc37b646af5865b75aaa5b49bfc Mon Sep 17 00:00:00 2001
From: Thomas Schmucker <ts@its1.de>
Date: Wed, 13 Nov 2024 22:20:30 +0100
Subject: aoc 2015, days 5, 6 and 7

---
 2015/src/day05.cpp | 56 ++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 56 insertions(+)
 create mode 100644 2015/src/day05.cpp

(limited to '2015/src/day05.cpp')

diff --git a/2015/src/day05.cpp b/2015/src/day05.cpp
new file mode 100644
index 0000000..b88ecf5
--- /dev/null
+++ b/2015/src/day05.cpp
@@ -0,0 +1,56 @@
+#include <algorithm>
+#include <fstream>
+#include <iostream>
+#include <regex>
+#include <string>
+#include <vector>
+
+using namespace std;
+
+auto
+read_file(string_view filename)
+{
+	fstream        input{ filename };
+	vector<string> lines;
+
+	for ( string line; getline(input, line); ) {
+		lines.emplace_back(line);
+	}
+
+	return lines;
+}
+
+void
+part1(const vector<string>& lines)
+{
+	const regex re1("(.*[aeiou]){3}");
+	const regex re2("(.)\\1");
+	const regex re3("(ab|cd|pq|xy)");
+
+	auto count = count_if(begin(lines), end(lines), [&](auto line) {
+		return regex_search(line, re1) && regex_search(line, re2) && !regex_search(line, re3);
+	});
+
+	cout << count << endl;
+}
+
+void
+part2(const vector<string>& lines)
+{
+	const regex re1("(..).*\\1");
+	const regex re2("(.).\\1");
+
+	auto count = count_if(begin(lines), end(lines), [&](auto line) {
+		return regex_search(line, re1) && regex_search(line, re2);
+	});
+
+	cout << count << endl;
+}
+
+int
+main()
+{
+	auto puzzle = read_file("data/day05.txt");
+	part1(puzzle);
+	part2(puzzle);
+}
-- 
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