AdventOfCode/C/2015/Day_2/main.c

#include <stdio.h>
#include <stdlib.h>
#include <stdbool.h>

#define IMP
#include "../../file.h"
#include "../../str.h"

struct rect {
	long l;
	long w;
	long h;
};

#define BL_MIN(v1, v2) ((((v1) >= (v2)) * (v2)) + (((v1) < (v2)) * (v1)))
#define BL_MAX(v1, v2) ((((v1) >= (v2)) * (v1)) + (((v1) < (v2)) * (v2)))

int
main(int argc, char *argv[])
{
	enum file_err ferr;
	long res = 0;

	size_t i = 0;
	struct rect r = {0};

	struct str str_input = {0};
	size_t num_lines = 0;

	struct rect *rects = NULL;
	size_t rects_size = 0;

	char *raw_input = NULL;
	size_t raw_input_size = 0;

	raw_input = (char *) file_read_all("./input.txt", 
					   &raw_input_size,
					   &ferr);
	if ( ferr != FILE_ERR_OK ) {
		fprintf(stderr, "Failed to open file: %s\n", 
			file_err_to_cstr(ferr));
		exit(EXIT_FAILURE);
	}

	str_input = str_from_cstr(raw_input, raw_input_size);

	num_lines = str_count_char(str_input, '\n');

	rects = calloc(num_lines, sizeof(*rects));

	{
		struct str_tokenizer st = str_tokenize(str_input, '\n');
		struct str str = str_tokenizer_next(&st);

		while ( str.size != (size_t) -1 ) {
			char *nstr = (char *) str.data;

			r.l = strtol(nstr, &nstr, 10);
			r.w = strtol(++nstr, &nstr, 10);
			r.h = strtol(++nstr, NULL, 10);

			rects[rects_size++] = r;

			str = str_tokenizer_next(&st);
		}
	}


	if ( argc == 1 ) {
		long s1 = 0;
		long s2 = 0;
		long s3 = 0;
		long m1 = 0;

		for ( i = 0; i < rects_size; ++i ) {
			r = rects[i];
			s1 = r.l * r.w;
			s2 = r.w * r.h;
			s3 = r.h * r.l;
			m1 = BL_MIN(s2, s3);
			res += (s1 * 2) + (s2 * 2) + (s3 * 2) + BL_MIN(s1, m1);
		}
	} else {
		long m1 = 0;
		long m2 = 0;
		long ma1 = 0;

		for ( i = 0; i < rects_size; ++i ) {
			r = rects[i];
			m1 = BL_MIN(r.l, r.w);
			ma1 = BL_MAX(r.l, r.w);
			m2 = BL_MIN(r.h, ma1);
			res += ((m1 + m1 + m2 + m2) + (r.l * r.w * r.h));
		}
	}

	printf("Result: %ld\n", res);

	free(rects);

	free(raw_input);

	(void) argc; (void) argv;
	return 0;
}