From acae6f3294ea3e61b137a8ca5e951786e7e920b7 Mon Sep 17 00:00:00 2001
From: subcrip <contact@subc.rip>
Date: Mon, 13 May 2024 15:39:56 +0800
Subject: [PATCH] Update include.hh

Signed-off-by: subcrip <contact@subc.rip>
---
 include.hh | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/include.hh b/include.hh
index 2bb20c2..cac19c8 100644
--- a/include.hh
+++ b/include.hh
@@ -418,7 +418,7 @@ vector<pair<T, U>> zip_n(Iterator_T a_first, Iterator_U b_first, size_t n) {
     return res;
 }
 template <typename T>
-class ArithmeticIterator {
+class ArithmeticIterator : bidirectional_iterator_tag {
 public:
     using difference_type = ptrdiff_t;
     using value_type = T;