2022: Day 3 complete

2022/3.c

@@ -0,0 +1,105 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+// Find badges for part 2
+char find_badge(char group[3][50]) {
+
+  for (int i = 0; i < strlen(group[0]); i++) {
+    for (int j = 0; j < strlen(group[1]); j++) {
+      for (int k = 0; k < strlen(group[2]); k++) {
+        if (group[0][i] == group[1][j] && group[1][j] == group[2][k]) {
+          return group[0][i];
+        }
+      }
+    }
+  }
+  return 0;
+}
+
+// Find items for part 1
+char find_item(char *items) {
+
+  int len = strlen(items);
+  int mid = len / 2;
+
+  for (int i = 0; i < mid; i++) {
+    for (int j = mid; j < len; j++) {
+      if (items[i] == items[j]) {
+        return items[i];
+      }
+    }
+  }
+  return 0;
+}
+
+// Updates item_sum / badge_sum when match is found
+void update_sum(const char c, int *sum) {
+
+  if (c > 64 && c < 91) {
+    *sum += c - 38;
+  } else if (c > 96 && c < 123) {
+    *sum += c - 96;
+  }
+}
+
+int main(int argc, char *argv[]) {
+
+  if (argc != 2) {
+    fprintf(stderr, "USAGE: %s input_file\n", argv[0]);
+    return 1;
+  }
+
+  FILE *file = fopen(argv[1], "r");
+  if (!file) {
+    perror("fopen");
+    return 1;
+  }
+
+  char items[50] = {0};
+  char group[3][50] = {0};
+  int item_sum = 0, badge_sum = 0, idx = 0;
+
+  while (fgets(items, sizeof items / sizeof *items, file) != NULL) {
+
+    if (strlen(items) == 1) {
+      break;
+    }
+
+    // Part 1 - find misplaced items
+    items[strlen(items) - 1] = '\0';
+    char match = find_item(items);
+    if (!match) {
+      fprintf(stderr, "Match not found: %s\n", items);
+    }
+
+    update_sum(match, &item_sum);
+
+    // Part 2 - find badges among groups of 3
+    memcpy(group[idx], items, strlen(items));
+    idx++;
+
+    if (idx == 3) {
+      idx = 0;
+      char badge = find_badge(group);
+      if (!badge) {
+        fprintf(stderr,
+                "Badge not found among the following group:\n%s\n%s\n%s\n",
+                group[0], group[1], group[2]);
+      }
+
+      update_sum(badge, &badge_sum);
+
+      for (int i = 0; i < sizeof group / sizeof *group; i++) {
+        memset(group[i], 0, sizeof group[0] / sizeof *group[0]);
+      }
+    }
+    memset(items, 0, sizeof items / sizeof *items);
+  }
+
+  fclose(file);
+  printf("Part 1 - Sum of item priorities:  %d\n", item_sum);
+  printf("Part 2 - Sum of badge priorities: %d\n", badge_sum);
+
+  return 0;
+}

2022/3.txt

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