From 3c366ab7d15ab6ce0b256202b7d5928397ab69e6 Mon Sep 17 00:00:00 2001
From: Bill Rossi <bassguitarbill@gmail.com>
Date: Sun, 1 Dec 2024 00:25:47 -0500
Subject: [PATCH] Dynamically count lines

---
 c/2024/1/historian_hysteria.c | 18 ++++++++----------
 c/lib/aoc.h                   |  9 +++++++++
 2 files changed, 17 insertions(+), 10 deletions(-)

diff --git a/c/2024/1/historian_hysteria.c b/c/2024/1/historian_hysteria.c
index a80ec5c..cafb41c 100644
--- a/c/2024/1/historian_hysteria.c
+++ b/c/2024/1/historian_hysteria.c
@@ -4,14 +4,12 @@
 
 #include "../../lib/aoc.h"
 
-// TODO figure this out dynamically
-#define ARRAY_SIZE 1000
-
 int main() {
   char *line;
+  int line_count = aoc_line_count();
 
-  int left[ARRAY_SIZE];
-  int right[ARRAY_SIZE];
+  int left[line_count];
+  int right[line_count];
   int index = 0;
 
   while ((line = aoc_read_line()) != NULL) {
@@ -22,12 +20,12 @@ int main() {
     index++;
   }
 
-  qsort(left, ARRAY_SIZE, sizeof(int), aoc_sort_int);
-  qsort(right, ARRAY_SIZE, sizeof(int), aoc_sort_int);
+  qsort(left, line_count, sizeof(int), aoc_sort_int);
+  qsort(right, line_count, sizeof(int), aoc_sort_int);
 
   int sum = 0;
 
-  for (int i = 0; i < ARRAY_SIZE; i++) {
+  for (int i = 0; i < line_count; i++) {
     sum += abs(left[i] - right[i]);
   }
 
@@ -36,9 +34,9 @@ int main() {
   int similarity_score = 0;
   int j = 0;
 
-  for (int i = 0; i < ARRAY_SIZE; i++) {
+  for (int i = 0; i < line_count; i++) {
     int right_count = 0;
-    for (; j < ARRAY_SIZE; j++) {
+    for (; j < line_count; j++) {
       if (left[i] == right[j]) right_count++;
       else if (left[i] < right[j]) break;
     }
diff --git a/c/lib/aoc.h b/c/lib/aoc.h
index 8ab52a9..aac3147 100644
--- a/c/lib/aoc.h
+++ b/c/lib/aoc.h
@@ -54,6 +54,15 @@ void aoc_free(void) {
   free(read_line_buffer);
 }
 
+int aoc_line_count(void) {
+  if (input_buffer == NULL) aoc_read_input();
+
+  int count = 0;
+  for (int i = 0; i < strlen(input_buffer); i++) {
+    if (input_buffer[i] == '\n') count++;
+  }
+  return count;
+}
 
 int aoc_sort_int(const void *a, const void *b) {
   return *(int*) a - *(int*) b;