From 8aa41e01b4e1ea59c99850dcfcc8304778f954de Mon Sep 17 00:00:00 2001
From: =?utf8?q?Luk=C3=A1=C5=A1=20Ji=C5=99i=C5=A1t=C4=9B?=
 <gymnazium.jiriste@gmail.com>
Date: Mon, 4 Dec 2023 20:09:08 +0100
Subject: [PATCH] Add solution to first part of day 4

---
 4/4.c | 83 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 83 insertions(+)
 create mode 100644 4/4.c

diff --git a/4/4.c b/4/4.c
new file mode 100644
index 0000000..697784e
--- /dev/null
+++ b/4/4.c
@@ -0,0 +1,83 @@
+
+#include <stdlib.h>
+#include <unistd.h>
+#include <fcntl.h>
+#include "libft.h"
+
+#define WINNING_NUM 10
+#define NUMBERS_NUM 25
+
+int	power(int base, int pow)
+{
+	if (base == 0 || base == 1)
+		return (base);
+	if (pow < 0)
+		return (0);
+	if (pow == 0)
+		return (1);
+	if (pow == 1)
+		return (base);
+	if (pow % 2)
+		return (power(base * base, pow / 2) * base);
+	return (power(base * base, pow / 2));
+}
+
+int	is_winning(int number, int winning[WINNING_NUM])
+{
+	int	i;
+
+	i = 0;
+	while (i < WINNING_NUM)
+		if (number == winning[i++])
+			return (1);
+	return (0);
+}
+
+int	score(const char *game)
+{
+	int	result;
+	int	winning[WINNING_NUM];
+	int	i;
+	int	pow;
+
+	game += ft_strlen("Card   1:");
+	i = 0;
+	while (i < WINNING_NUM)
+	{
+		winning[i++] = ft_atoi(game);
+		game += 3;
+	}
+	i = 0;
+	game += 2;
+	pow = -1;
+	while (i < NUMBERS_NUM)
+	{
+		pow += is_winning(ft_atoi(game), winning);
+		game += 3;
+		++i;
+	}
+	return (power(2, pow));
+}
+
+int main(int argc, char **argv)
+{
+	int		result;
+	char	*game;
+	int		fd;
+
+	if (argc != 2)
+		return (1);
+	fd = open(argv[1], O_RDONLY);
+	if (fd < 0)
+		return (2);
+	game = get_next_line(fd);
+	result = 0;
+	while (game)
+	{
+		result += score(game);
+		free(game);
+		game = get_next_line(fd);
+	}
+	ft_printf("The resulting score is %i.\n", result);
+	return (0);
+}
-- 
2.30.2