day 2, parts 1 & 2 (C)

2021-12-03 18:45:24 +01:00
parent 172dac6bfe
commit adcc449bea
3 changed files with 141 additions and 9 deletions
--- a/2021/day02/aoc-c.c
+++ b/2021/day02/aoc-c.c
@@ -0,0 +1,110 @@
+/* aoc-c: Advent2021 game, day 2 parts 1 & 2
+ *
+ * Copyright (C) 2021 Bruno Raoult ("br")
+ * Licensed under the GNU General Public License v3.0 or later.
+ * Some rights reserved. See COPYING.
+ *
+ * You should have received a copy of the GNU General Public License along with this
+ * program. If not, see <https://www.gnu.org/licenses/gpl-3.0-standalone.htmlL>.
+ *
+ * SPDX-License-Identifier: GPL-3.0-or-later <https://spdx.org/licenses/GPL-3.0-or-later.html>
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+
+#include "debug.h"
+#include "bits.h"
+#include "pool.h"
+
+struct ranges {
+    u32 val;
+    struct list_head list;
+};
+
+LIST_HEAD(list_head);
+
+int ex1()
+{
+    u32 val;
+    char buffer[80];
+    s32 forward = 0, depth = 0;
+
+    while (scanf("%s %d", buffer, &val) != EOF) {
+        switch (*buffer) {
+            case 'f':                             /* forward */
+                forward += val;
+                break;
+            case 'd':                             /* down */
+                depth += val;
+                break;
+            case 'u':                             /* up */
+                depth -= val;
+                break;
+        }
+    }
+    return depth * forward;
+}
+
+int ex2()
+{
+    u32 val;
+    char buffer[80];
+    s32 aim = 0, forward = 0, depth = 0;
+
+    while (scanf("%s %d", buffer, &val) != EOF) {
+        switch (*buffer) {
+            case 'f':                             /* forward */
+                forward += val;
+                depth += val * aim;
+                break;
+            case 'd':                             /* down */
+                aim += val;
+                break;
+            case 'u':                             /* up */
+                aim -= val;
+                break;
+        }
+    }
+    return depth * forward;
+}
+
+static int usage(char *prg)
+{
+    fprintf(stderr, "Usage: %s [-d debug_level] [-p part]\n", prg);
+    return 1;
+}
+
+int main(int ac, char **av)
+{
+    int opt;
+    u32 exercise = 2, res;
+
+    while ((opt = getopt(ac, av, "d:p:")) != -1) {
+        switch (opt) {
+            case 'd':
+                debug_level_set(atoi(optarg));
+                break;
+            case 'p':                             /* 1 or 2 */
+                exercise = atoi(optarg);
+                break;
+            default:
+                return usage(*av);
+        }
+    }
+
+    if (optind < ac)
+        return usage(*av);
+
+    if (exercise == 1) {
+        res = ex1();
+        printf ("%s : res=%d\n", *av, res);
+    }
+    if (exercise == 2) {
+        res = ex2();
+        printf ("%s : res=%d\n", *av, res);
+    }
+
+    exit (0);
+}