From a6e8d68a9b406027f48fb81cae6cf13d073ffa5a Mon Sep 17 00:00:00 2001
From: Gloria Mundi <gloria@gloria-mundi.eu>
Date: Sun, 23 Jun 2024 01:13:23 +0200
Subject: simplify fenwick tree

---
 datastructures/fenwickTree.cpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

(limited to 'datastructures/fenwickTree.cpp')

diff --git a/datastructures/fenwickTree.cpp b/datastructures/fenwickTree.cpp
index 8c73b78..7013613 100644
--- a/datastructures/fenwickTree.cpp
+++ b/datastructures/fenwickTree.cpp
@@ -10,6 +10,6 @@ void init(int n) {
 
 ll prefix_sum(int i) {
 	ll sum = 0;
-	for (; i > 0; i -= i & -i) sum += tree[i];
+	for (; i > 0; i &= i-1) sum += tree[i];
 	return sum;
 }
-- 
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