From 3816dae6c0603b2b30a8da370b56554db97b76c8 Mon Sep 17 00:00:00 2001
From: Shuli Shu <08cnbj@gmail.com>
Date: Fri, 18 Oct 2024 18:00:22 +0000
Subject: [PATCH] optimize the vec dis joint

---
 pennylane_lightning/core/src/utils/Util.hpp | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/pennylane_lightning/core/src/utils/Util.hpp b/pennylane_lightning/core/src/utils/Util.hpp
index 0186064f1..6f512ac40 100644
--- a/pennylane_lightning/core/src/utils/Util.hpp
+++ b/pennylane_lightning/core/src/utils/Util.hpp
@@ -585,7 +585,11 @@ std::vector<T1> cast_vector(const std::vector<T0> &vec) {
 template <typename T = std::size_t>
 bool areVecsDisjoint(const std::vector<T> &v1, const std::vector<T> &v2) {
     std::set<T> s0(v1.begin(), v1.end());
-    s0.insert(v2.begin(), v2.end());
-    return s0.size() == v1.size() + v2.size();
+    for (const auto &element : v2) {
+        if (s0.find(element) != s0.end()) {
+            return false;
+        }
+    }
+    return true;
 }
 } // namespace Pennylane::Util