add day 13

2024/13/part1.c

@@ -0,0 +1,71 @@
+/* ************************************************************************** */
+/*                                                                            */
+/*                                                        :::      ::::::::   */
+/*   part1.c                                            :+:      :+:    :+:   */
+/*                                                    +:+ +:+         +:+     */
+/*   By: tomoron <tomoron@student.42.fr>            +#+  +:+       +#+        */
+/*                                                +#+#+#+#+#+   +#+           */
+/*   Created: 2024/07/17 23:03:36 by tomoron           #+#    #+#             */
+/*   Updated: 2024/12/13 23:41:42 by tomoron          ###   ########.fr       */
+/*                                                                            */
+/* ************************************************************************** */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <math.h>
+#include "libft/libft.h"
+
+static void get_pos(char *line, long int *res)
+{
+	while(*line && *line != 'X')
+		line++;
+	if(*line)
+	{
+		line += 2;
+		res[0] = atoi(line);
+	}
+	while(*line && *line != 'Y')
+		line++;
+	if(*line)
+	{
+		line += 2;
+		res[1] = atoi(line);	
+	}
+}
+
+static long int get_score(long int btn_a[2],long int btn_b[2],long int prize[2])
+{
+	double a;
+	double b;
+	long int res[2];
+
+	a = ((prize[1] * btn_b[0]) - (prize[0] * btn_b[1])) / ((btn_a[1] * btn_b[0]) - (btn_a[0] * btn_b[1]));
+	b = (((-btn_a[0] * a) + prize[0]) / btn_b[0]);
+	res[0] = a;
+	res[1] = b;
+	if((btn_a[0] * res[0]) + (btn_b[0] * res[1]) != prize[0] || (btn_a[1] * res[0]) + (btn_b[1] * res[1]) != prize[1])
+		return(0);
+	return((a * 3) + b);
+}
+
+long int resolve_part1(char *input, char **split)
+{
+	(void)input;
+	long int btn_a[2];
+	long int btn_b[2];
+	long int prize[2];
+	long int res;
+
+	res = 0;
+	while(*split)
+	{
+		get_pos(*split, btn_a);
+		split++;
+		get_pos(*split, btn_b);
+		split++;
+		get_pos(*split, prize);
+		split++;
+		res += get_score(btn_a, btn_b, prize);
+	}
+	return(res);
+}