102 lines
2.4 KiB
C
102 lines
2.4 KiB
C
/* aoc-c: Advent2021 game, day 2 parts 1 & 2
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*
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* Copyright (C) 2021 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 "bits.h"
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int ex1()
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{
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u32 val;
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char buffer[80];
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s32 forward = 0, depth = 0;
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while (scanf("%s %d", buffer, &val) != EOF) {
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switch (*buffer) {
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case 'f': /* forward */
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forward += val;
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break;
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case 'd': /* down */
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depth += val;
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break;
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case 'u': /* up */
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depth -= val;
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break;
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}
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}
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return depth * forward;
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}
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int ex2()
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{
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u32 val;
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char buffer[80];
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s32 aim = 0, forward = 0, depth = 0;
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while (scanf("%s %d", buffer, &val) != EOF) {
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switch (*buffer) {
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case 'f': /* forward */
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forward += val;
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depth += val * aim;
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break;
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case 'd': /* down */
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aim += val;
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break;
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case 'u': /* up */
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aim -= val;
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break;
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}
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}
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return depth * forward;
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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;
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u32 exercise = 1, res;
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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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exercise = atoi(optarg);
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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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if (exercise == 1) {
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res = ex1();
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printf ("%s : res=%d\n", *av, res);
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} else {
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res = ex2();
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printf ("%s : res=%d\n", *av, res);
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}
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exit (0);
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}
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