From 55c8a1598369d7e3ab0862dc18bae29eaa7ead53 Mon Sep 17 00:00:00 2001
From: Bananymous <oskari.alaranta@bananymous.com>
Date: Wed, 25 Dec 2024 18:13:57 +0200
Subject: [PATCH] aoc2024: Implement day25 solution

This was a nice AOC season. First time I fully completed it! I may still
optimize my solutions as some of them are a bit slow...
---
 userspace/aoc2024/CMakeLists.txt       |  1 +
 userspace/aoc2024/day25/CMakeLists.txt |  9 +++
 userspace/aoc2024/day25/main.cpp       | 80 ++++++++++++++++++++++++++
 3 files changed, 90 insertions(+)
 create mode 100644 userspace/aoc2024/day25/CMakeLists.txt
 create mode 100644 userspace/aoc2024/day25/main.cpp

diff --git a/userspace/aoc2024/CMakeLists.txt b/userspace/aoc2024/CMakeLists.txt
index 92996a09..e9d1d711 100644
--- a/userspace/aoc2024/CMakeLists.txt
+++ b/userspace/aoc2024/CMakeLists.txt
@@ -23,6 +23,7 @@ set(AOC2024_PROJECTS
 	day22
 	day23
 	day24
+	day25
 	full
 )
 
diff --git a/userspace/aoc2024/day25/CMakeLists.txt b/userspace/aoc2024/day25/CMakeLists.txt
new file mode 100644
index 00000000..12ddc449
--- /dev/null
+++ b/userspace/aoc2024/day25/CMakeLists.txt
@@ -0,0 +1,9 @@
+set(SOURCES
+	main.cpp
+)
+
+add_executable(aoc2024_day25 ${SOURCES})
+banan_include_headers(aoc2024_day25 ban)
+banan_link_library(aoc2024_day25 libc)
+
+install(TARGETS aoc2024_day25 OPTIONAL)
diff --git a/userspace/aoc2024/day25/main.cpp b/userspace/aoc2024/day25/main.cpp
new file mode 100644
index 00000000..e0ae1ce1
--- /dev/null
+++ b/userspace/aoc2024/day25/main.cpp
@@ -0,0 +1,80 @@
+#include <BAN/Array.h>
+#include <BAN/Vector.h>
+
+#include <inttypes.h>
+#include <stdio.h>
+
+using i8  = int8_t;
+using i16 = int16_t;
+using i32 = int32_t;
+using i64 = int64_t;
+using isize = ssize_t;
+
+using u8  = uint8_t;
+using u16 = uint16_t;
+using u32 = uint32_t;
+using u64 = uint64_t;
+using usize = size_t;
+
+i64 part1(FILE* fp)
+{
+	BAN::Vector<BAN::Array<u8, 5>> locks;
+	BAN::Vector<BAN::Array<u8, 5>> keys;
+
+	for (;;)
+	{
+		char buffer[6*7 + 1];
+		if (fread(buffer, 1, sizeof(buffer), fp) < sizeof(buffer) - 1)
+			break;
+
+		BAN::Array<u8, 5> obj;
+		for (usize j = 1; j <= 5; j++)
+			for (usize i = 0; i < 5; i++)
+				obj[i] += (buffer[6 * j + i] == '#');
+
+		MUST((buffer[0] == '#' ? locks : keys).push_back(obj));
+	}
+
+	u32 result = 0;
+	for (auto lock : locks)
+	{
+		for (auto key : keys)
+		{
+			bool valid = true;
+			for (usize i = 0; i < 5 && valid; i++)
+				valid = (key[i] + lock[i] <= 5);
+			result += valid;
+		}
+	}
+
+	return result;
+}
+
+i64 part2(FILE* fp)
+{
+	(void)fp;
+	return -1;
+}
+
+int main(int argc, char** argv)
+{
+	const char* file_path = "/usr/share/aoc2024/day25_input.txt";
+
+	if (argc >= 2)
+		file_path = argv[1];
+
+	FILE* fp = fopen(file_path, "r");
+	if (fp == nullptr)
+	{
+		perror("fopen");
+		return 1;
+	}
+
+	printf("part1: %" PRId64 "\n", part1(fp));
+
+	fseek(fp, 0, SEEK_SET);
+
+	printf("part2: %" PRId64 "\n", part2(fp));
+
+	fclose(fp);
+}