From ed65c5937950373f96026f476c03bf8984360900 Mon Sep 17 00:00:00 2001
From: Thomas Schmucker <ts@its1.de>
Date: Thu, 14 Nov 2024 16:49:45 +0100
Subject: aoc 2015, day 8

---
 2015/src/day08.cpp | 71 ++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 71 insertions(+)
 create mode 100644 2015/src/day08.cpp

diff --git a/2015/src/day08.cpp b/2015/src/day08.cpp
new file mode 100644
index 0000000..9cd6e21
--- /dev/null
+++ b/2015/src/day08.cpp
@@ -0,0 +1,71 @@
+#include <fstream>
+#include <iostream>
+#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)
+{
+	auto count = [](const string& line) -> size_t {
+		size_t length = 0;
+		auto   iter   = begin(line);
+
+		while ( iter != end(line) ) {
+			if ( *iter == '\\' ) {
+				++iter;
+				if ( *iter == '\\' || *iter == '"' ) {
+					++length;
+					++iter;
+				}
+				else if ( *iter == 'x' ) {
+					++length;
+					iter += 3;
+				}
+			}
+			else {
+				++iter;
+				++length;
+			}
+		}
+		return length - 2;
+	};
+
+	size_t sum = 0;
+	for ( const auto& line: lines ) {
+		sum += line.size() - count(line);
+	}
+	cout << sum << endl;
+}
+
+void
+part2(const vector<string>& lines)
+{
+	long sum = 0;
+	for ( const auto& line: lines ) {
+		sum += 2 + count_if(begin(line), end(line), [](auto chr) { return chr == '\\' || chr == '"'; });
+	}
+	cout << sum << endl;
+}
+
+int
+main()
+{
+	auto lines = read_file("data/day08.txt");
+	part1(lines);
+	part2(lines);
+}
-- 
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