add day 21

2024/21/part1.c

@@ -0,0 +1,205 @@
+/* ************************************************************************** */
+/*                                                                            */
+/*                                                        :::      ::::::::   */
+/*   part1.c                                            :+:      :+:    :+:   */
+/*                                                    +:+ +:+         +:+     */
+/*   By: tomoron <tomoron@student.42.fr>            +#+  +:+       +#+        */
+/*                                                +#+#+#+#+#+   +#+           */
+/*   Created: 2024/07/17 23:03:36 by tomoron           #+#    #+#             */
+/*   Updated: 2024/12/22 20:19:21 by tomoron          ###   ########.fr       */
+/*                                                                            */
+/* ************************************************************************** */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <stdint.h>
+#include "libft/libft.h"
+
+typedef struct s_cache
+{
+	char *str;
+	int pos[2];
+	int depth;
+	uint64_t res;
+	struct s_cache *next;
+}	t_cache;
+
+static void get_char_pos(char **map, char c, int *res)
+{
+	res[0] = 0;
+	while(map[res[0]])
+	{
+		res[1] = 0;
+		while(map[res[0]][res[1]])
+		{
+			if(map[res[0]][res[1]] == c)
+				return ;
+			res[1]++;
+		}
+		res[0]++;
+	}
+}
+
+static void add_char(int nb, char c, char *res, int *i)
+{
+	if(nb < 0)
+		nb *= -1;
+	while(nb > 0)
+	{
+		res[(*i)++] = c;
+		nb--;
+	}
+	res[*i] = 0;
+}
+
+int move_y(char **map, int diff[2], int from[2])
+{
+	int diff_spc[2];
+	int spc[2];
+
+	get_char_pos(map, ' ', spc);
+	diff_spc[0] = spc[0] - from[0];
+	diff_spc[1] = spc[1] - from[1];
+	return((diff[1] > 0 || (diff_spc[1] == diff[1] && diff_spc[0] == 0)) && (diff_spc[0] != diff[0] || diff_spc[1] != 0));
+}
+
+char *plan_route(char **map, int from[2], int to[2])
+{
+	int diff[2];
+	char chrs[2];
+	char *res;
+	int i;
+
+	res = malloc(128);
+	i = 0;
+	chrs[0] = 'v';
+	chrs[1] = '>';
+	diff[0] = to[0] - from[0];
+	diff[1] = to[1] - from[1];
+	if(diff[0] < 0)
+		chrs[0] = '^';
+	if(diff[1] < 0)
+		chrs[1] = '<';
+	if(move_y(map, diff, from))
+	{
+		add_char(diff[0], chrs[0], res, &i);
+		add_char(diff[1], chrs[1], res, &i);
+	}
+	else
+	{
+		add_char(diff[1], chrs[1], res, &i);	
+		add_char(diff[0], chrs[0], res, &i);
+	}
+	res[i] = 'A';
+	res[i + 1] = 0;
+	return(res);
+}
+
+uint64_t get_cache(t_cache *cache, char *str, int depth, int *pos)
+{
+	int i;
+	i = 0;
+	while(cache)
+	{
+		if(!ft_strcmp(cache->str, str) && cache->depth == depth && cache->pos[0] == pos[0] && cache->pos[1] == pos[1])
+		{
+			printf("cache used\n");
+			return(cache->res);
+		}
+		cache = cache->next;
+		i++;
+	}
+	printf("cache len : %d\n", i);
+	return(0);
+}
+
+void add_cache(t_cache **cache, char *str, int depth, int *pos, uint64_t res)
+{
+	t_cache *new;
+
+	new = malloc(sizeof(t_cache));
+	new->str = ft_strdup(str);
+	new->depth = depth;
+	new->pos[0] = pos[0];
+	new->pos[1] = pos[1];
+	new->res = res;
+	new->next = *cache;
+	*cache = new;
+}
+
+uint64_t get_path_len(char **keypad, char **robot_pad, int **pos, char *objectives, int depth)
+{
+	static t_cache *cache;
+	int cur_objective[2];
+	char *path;
+	uint64_t res;
+	int i;
+
+	res = get_cache(cache, objectives, depth, pos[depth]);
+	i = 0;
+	if(res)
+		return(res);
+	while(objectives[i])
+	{
+		if(depth != 0)
+			keypad = robot_pad;
+		get_char_pos(keypad, objectives[i], cur_objective);
+		path = plan_route(keypad, pos[depth], cur_objective);
+		if(depth < 25)
+			res += get_path_len(keypad, robot_pad, pos, path, depth + 1);
+		else
+			res += ft_strlen(path);
+		free(path);
+		pos[depth][0] = cur_objective[0];
+		pos[depth][1] = cur_objective[1];
+		i++;
+	}
+	add_cache(&cache, objectives, depth, pos[depth], res);
+	return(res);
+}
+
+int **init_positions(int nb)
+{
+	int **res;
+	int i;
+
+	res = malloc((nb + 1) * sizeof(int *));
+	res[nb] = 0;
+	i = 0;
+	while(i < nb)
+	{
+		res[i] = malloc(2 * sizeof(int));
+		res[i][0] = 0;
+		res[i][1] = 2;
+		if(i == 0)
+			res[i][0] = 3;
+		i++;
+	}
+	return(res);
+}
+
+uint64_t resolve_part1(char *input, char **split)
+{
+	(void)input;
+	(void)split;
+	int **pos;
+	uint64_t res;
+	char **keypad;
+	char **robot_pad;
+
+	keypad = ft_split("789\n456\n123\n 0A", '\n');
+	robot_pad = ft_split(" ^A\n<v>", '\n');
+	pos = init_positions(30);
+	res = 0;
+	while(*split)
+	{
+		printf("%s\n", *split);
+//		printf("%zu\n", get_path_len(keypad, robot_pad, pos, *split, 0));
+		res += get_path_len(keypad, robot_pad, pos, *split, 0) * ft_atoi(*split);
+		split++;
+	}
+	ft_free_str_arr((void *)pos);
+	ft_free_str_arr(keypad);
+	ft_free_str_arr(robot_pad);
+	return(res);
+}