75 lines
1.6 KiB
C
75 lines
1.6 KiB
C
/* aoc-c.c: Advent of Code 2019, day 1 parts 1 & 2
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*
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* Copyright (C) 2022 Bruno Raoult ("br")
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* Licensed under the GNU General Public License v3.0 or later.
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* Some rights reserved. See COPYING.
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*
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* You should have received a copy of the GNU General Public License along with this
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* program. If not, see <https://www.gnu.org/licenses/gpl-3.0-standalone.html>.
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*
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* SPDX-License-Identifier: GPL-3.0-or-later <https://spdx.org/licenses/GPL-3.0-or-later.html>
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include "debug.h"
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#include "pool.h"
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#include "list.h"
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#include "bits.h"
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static u64 part1()
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{
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u64 res = 0;
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int cur;
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while (scanf("%d", &cur) != EOF)
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res += cur / 3 - 2;
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return res;
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}
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static u64 part2()
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{
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u64 res = 0;
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int cur;
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while (scanf("%d", &cur) != EOF)
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while ((cur = cur / 3 - 2) > 0)
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res += cur;
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return res;
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}
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static int usage(char *prg)
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{
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fprintf(stderr, "Usage: %s [-d debug_level] [-p part]\n", prg);
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return 1;
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}
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int main(int ac, char **av)
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{
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int opt, part = 1;
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while ((opt = getopt(ac, av, "d:p:")) != -1) {
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switch (opt) {
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case 'd':
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debug_level_set(atoi(optarg));
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break;
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case 'p': /* 1 or 2 */
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part = atoi(optarg);
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if (part < 1 || part > 2)
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return usage(*av);
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break;
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default:
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return usage(*av);
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}
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}
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if (optind < ac)
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return usage(*av);
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printf("%s : res=%lu\n", *av, part == 1? part1(): part2());
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exit (0);
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}
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