From b8ba9942f5d9b1f395036dd87574a905ce47f23a Mon Sep 17 00:00:00 2001
From: Grant Horner <h.grant.horner@gmail.com>
Date: Mon, 22 Jun 2026 10:14:36 -0400
Subject: [PATCH] finish day2

---
 day2.jai | 34 +++++++++++++++++++++++++++++-----
 1 file changed, 29 insertions(+), 5 deletions(-)

diff --git a/day2.jai b/day2.jai
index 189293c..b14d4b4 100644
--- a/day2.jai
+++ b/day2.jai
@@ -7,7 +7,21 @@ Chunk :: struct {
     original: string;
 }
 
-solve_second :: (input: string, enable_debug_logging := false) {
+main :: () {
+    content := read_entire_file("day2.input");
+    solve_first(content);
+    solve_second(content);
+}
+
+solve_first :: (input: string) {
+    solve(input, split_into_halves);
+}
+
+solve_second :: (input: string) {
+    solve(input, split_into_even_chunks);
+}
+
+solve :: (input: string, chunking_fn: (string) -> [..]Chunk, enable_debug_logging := false) {
     duplicate_sum := 0;
     int_sb: String_Builder;
     for range: split(input, ",") {
@@ -19,7 +33,7 @@ solve_second :: (input: string, enable_debug_logging := false) {
         for i: left..right {
             print_to_builder(*int_sb, "%", i);
             i_str := builder_to_string(*int_sb);
-            for split_into_even_chunks(i_str) {
+            for chunking_fn(i_str) {
                 if all_equal(array_view(it.chunks, 0)) {
                     if enable_debug_logging print_vars(it);
                     duplicate_sum += i;
@@ -31,9 +45,19 @@ solve_second :: (input: string, enable_debug_logging := false) {
     print_vars(duplicate_sum);
 }
 
-main :: () {
-    content := read_entire_file("day2.input");
-    solve_second(content);
+split_into_halves :: (s: string) -> [..]Chunk {
+    result: [..]Chunk;
+    if s.count % 2 != 0 return result;
+
+    chunk_len := s.count / 2;
+    chunks := Chunk.{original=s};
+    chunk_i := 0;
+    for chunk_i: 0..1 {
+        array_add(*chunks.chunks, string.{data=s.data + (chunk_i * chunk_len), count = chunk_len});
+    }
+    array_add(*result, chunks);
+
+    return result;
 }
 
 split_into_even_chunks :: (s: string) -> [..]Chunk {