From: Lukáš Jiřiště <gymnazium.jiriste@gmail.com>
Date: Sun, 3 Dec 2023 21:53:46 +0000 (+0100)
Subject: Add solution to first part of day 2
X-Git-Url: https://git.ljiriste.work/?a=commitdiff_plain;h=f48fb58af096ebfcb2b797ecb32be72734397610;p=AoC_2023.git

Add solution to first part of day 2
---

diff --git a/2/2.c b/2/2.c
new file mode 100644
index 0000000..720db53
--- /dev/null
+++ b/2/2.c
@@ -0,0 +1,146 @@
+
+#include <stdlib.h>
+#include <unistd.h>
+#include <fcntl.h>
+#include "libft.h"
+
+struct	s_draw
+{
+	int	r;
+	int	g;
+	int	b;
+};
+typedef struct s_draw	t_draw;
+
+struct	s_game
+{
+	int		id;
+	size_t	size;
+	t_draw	*draws;
+};
+typedef struct s_game	t_game;
+
+size_t	count_semicolons(const char *str)
+{
+	size_t	res;
+
+	res = 0;
+	while (*str)
+	{
+		if (*str == ';')
+			++res;
+		++str;
+	}
+	return (res);
+}
+
+void	fill_draw(t_draw *draw, const char **line)
+{
+	int	cubes;
+
+	cubes = ft_atoi(*line);
+	while (!ft_isalpha(**line))
+		++(*line);
+	if (**line == 'r')
+	{
+		draw->r = cubes;
+		*line += 3;
+	}
+	else if (**line == 'g')
+	{
+		draw->g = cubes;
+		*line += 5;
+	}
+	else if (**line == 'b')
+	{
+		draw->b = cubes;
+		*line += 4;
+	}
+	return ;
+}
+
+void	zero_draws(t_game *game)
+{
+	size_t	i;
+
+	i = 0;
+	while (i < game->size)
+	{
+		game->draws[i] = (t_draw){.r = 0, .g = 0, .b = 0};
+		++i;
+	}
+	return ;
+}
+
+t_game	parse(const char *line)
+{
+	t_game	game;
+	size_t	i;
+
+	while (!ft_isdigit(*line))
+		++line;
+	game.id = ft_atoi(line);
+	while (*line != ':')
+		++line;
+	game.size = count_semicolons(line) + 1;
+	game.draws = malloc(sizeof(t_draw) * game.size);
+	if (!game.draws)
+		return (game);
+	zero_draws(&game);
+	i = 0;
+	while (*line && *line != '\n')
+	{
+		line += 2;
+		fill_draw(game.draws + i, &line);
+		if (*line == ';')
+			++i;
+	}
+	return (game);
+}
+
+int possible(t_game game)
+{
+	const int	max_r = 12;
+	const int	max_g = 13;
+	const int	max_b = 14;
+	size_t		i;
+	t_draw		draw;
+
+	i = 0;
+	while (i < game.size)
+	{
+		draw = game.draws[i];
+		if (max_r < draw.r || max_g < draw.g || max_b < draw.b)
+			return (0);
+		++i;
+	}
+	return (1);
+}
+
+int	main(int argc, char **argv)
+{
+	char	*line;
+	int		result;
+	int		fd;
+	t_game	game;
+
+	if (argc != 2)
+		return (1);
+	fd = open(argv[1], O_RDONLY);
+	if (fd <= 0)
+		return (2);
+	line = get_next_line(fd);
+	result = 0;
+	while (line)
+	{
+		game = parse(line);
+		if (possible(game))
+			result += game.id;
+		free(line);
+		free(game.draws);
+		line = get_next_line(fd);
+	}
+	ft_printf("Resulting sum of game is %i.\n", result);
+	close(fd);
+	return (0);
+}