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/day13.cpp | 115 ----------------------------------------------------------
 1 file changed, 115 deletions(-)
 delete mode 100644 src/day13.cpp

(limited to 'src/day13.cpp')

diff --git a/src/day13.cpp b/src/day13.cpp
deleted file mode 100644
index 549457b..0000000
--- a/src/day13.cpp
+++ /dev/null
@@ -1,115 +0,0 @@
-#include <algorithm>
-#include <fstream>
-#include <iostream>
-#include <iterator>
-#include <sstream>
-#include <string>
-#include <vector>
-using namespace std;
-
-string
-read_file(string_view filename)
-{
-	fstream input{ filename };
-	return { istreambuf_iterator<char>{ input }, istreambuf_iterator<char>{} };
-}
-
-vector<string>
-split(string_view line, string_view delimiter)
-{
-	size_t pos_start = 0;
-	size_t pos_end   = 0;
-
-	vector<string> res;
-
-	while ( (pos_end = line.find(delimiter, pos_start)) != std::string::npos ) {
-		auto token = line.substr(pos_start, pos_end - pos_start);
-		pos_start  = pos_end + delimiter.length();
-
-		res.emplace_back(token);
-	}
-
-	res.emplace_back(line.substr(pos_start));
-	return res;
-}
-
-vector<string>
-transpose(const vector<string>& lines)
-{
-	vector<string> result(lines[0].size());
-
-	for ( const auto& line: lines ) {
-		for ( size_t i = 0; i < line.size(); ++i ) {
-			result[i] += line[i];
-		}
-	}
-	return result;
-}
-
-long
-find_mirror(const vector<string>& input)
-{
-	for ( size_t idx = 1; idx < input.size(); ++idx ) {
-		bool equal = true;
-		for ( size_t cnt = 0; cnt != min(idx, input.size() - idx); ++cnt ) {
-			if ( !(input[idx + cnt] == input[idx - 1 - cnt]) ) {
-				equal = false;
-				break;
-			}
-		}
-		if ( equal ) {
-			return long(idx);
-		}
-	}
-	return 0;
-}
-
-long
-count_differences(string_view str1, string_view str2)
-{
-	long diffs = 0;
-	for ( size_t idx = 0; idx != str1.size(); ++idx ) {
-		diffs += long(str1[idx] != str2[idx]);
-	}
-	return diffs;
-}
-
-long
-find_mirror_part2(const vector<string>& input)
-{
-	for ( size_t idx = 1; idx < input.size(); ++idx ) {
-		long errs = 0;
-		for ( size_t i = 0; i != min(idx, input.size() - idx); ++i ) {
-			errs += count_differences(input[idx + i], input[idx - 1 - i]);
-		}
-		if ( errs == 1 ) {
-			return long(idx);
-		}
-	}
-	return 0;
-}
-
-void
-solve(const function<long(const vector<string>&)>& find_mirror)
-{
-	static const long multiplier = 100;
-
-	auto contents = read_file("data/day13.txt");
-	auto parts    = split(contents, "\n\n");
-
-	long sum = 0;
-	for ( const auto& part: parts ) {
-		auto lines = split(part, "\n");
-
-		sum += find_mirror(transpose(lines));
-		sum += find_mirror(lines) * multiplier;
-	}
-	cout << sum << endl;
-}
-
-int
-main()
-{
-	solve(find_mirror);
-	solve(find_mirror_part2);
-}
-- 
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