From 17d91c270157d35ee41470f831804546c899f741 Mon Sep 17 00:00:00 2001
From: zihang <yezihang@idea.edu.cn>
Date: Thu, 28 Nov 2024 18:33:16 +0800
Subject: [PATCH] fix: update code

---
 next/sources/segment-tree/src/part2/top.mbt | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/next/sources/segment-tree/src/part2/top.mbt b/next/sources/segment-tree/src/part2/top.mbt
index 837e8f03..cceeea2a 100644
--- a/next/sources/segment-tree/src/part2/top.mbt
+++ b/next/sources/segment-tree/src/part2/top.mbt
@@ -112,7 +112,9 @@ fn modify(
     self.apply(tag)
   } else {
     guard let Node(left~, right~, ..) = self
-    left.apply(tag) + right.apply(tag)
+    let mid = (l + r) >> 1
+    left.modify(l, mid, modify_l, modify_r, tag) +
+    right.modify(mid + 1, r, modify_l, modify_r, tag)
   }
 }
 // end modify definition