c 2024 3 part 1

c/2024/3/mull_it_over.c

@@ -0,0 +1,69 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <stdbool.h>
+
+#include "../../lib/aoc.h"
+
+enum State { M, U, L, OPEN, D1, COMMA, D2, CLOSE };
+
+int main() {
+  char *line;
+
+  int sum = 0;
+
+  char d1[10], d2[10];
+  int d1_index, d2_index;
+
+  while ((line = aoc_read_line()) != NULL) {
+    enum State state = M;
+    char *c = line;
+    while(*c != '\0') {
+      switch (state) {
+      case M:
+	if (*c == 'm') state = U;
+	break;
+      case U:
+	if (*c == 'u') state = L;
+	else state = M;
+	break;
+      case L:
+	if (*c == 'l') state = OPEN;
+	else state = M;
+	break;
+      case OPEN:
+	d1_index = 0;
+	d2_index = 0;
+	if (*c == '(') state = D1;
+	else state = M;
+	break;
+      case D1:
+	if (*c >= '0' && *c <= '9') {
+	  d1[d1_index++] = *c;
+	}
+	else if(*c == ',') state = D2;
+	else state = M;
+	break;
+      case D2:
+	if (*c >= '0' && *c <= '9') {
+	  d2[d2_index++] = *c;
+	}
+	else if(*c == ')') {
+	  d1[d1_index] = '\0';
+	  d2[d2_index] = '\0';
+	  sum += atoi(d1) * atoi(d2);
+	  state = M;
+	}
+	else state = M;
+	break;
+      }
+      c++;
+    }
+  }
+
+  printf("Part 1: %d\n", sum);
+  // printf("Part 2: %d\n", safe_skip_report_count);
+
+  aoc_free();
+  return 0;
+}