diff --git a/cpp/2305/LC230503.cpp b/cpp/2305/LC230503.cpp
new file mode 100644
index 0000000..8b321eb
--- /dev/null
+++ b/cpp/2305/LC230503.cpp
@@ -0,0 +1,36 @@
+#include <algorithm>
+#include <iterator>
+#include <vector>
+#include <unordered_set>
+
+/**
+ * 2215. Find the Difference of Two Arrays
+ *
+ * Given two 0-indexed integer arrays nums1 and nums2, return a list answer of size 2 where:
+ * answer[0] is a list of all distinct integers in nums1 which are not present in nums2.
+ * answer[1] is a list of all distinct integers in nums2 which are not present in nums1.
+ * Note that the integers in the lists may be returned in any order.
+ */
+
+class LC230503 {
+public:
+	template<typename T>
+	using V = std::vector<T>;
+	using VVI = V<V<int>>;
+	using CVIR = const V<int>&;
+
+	static VVI findDifference(CVIR, CVIR) noexcept;
+};
+
+LC230503::VVI LC230503::findDifference(CVIR x, CVIR y) noexcept {
+	using USI = std::unordered_set<int>;
+	USI sx(x.begin(), x.end()), sy(y.begin(), y.end());
+	auto proc = [&](const USI& p, const USI& q) {
+		V<int> r;
+		std::copy_if(p.begin(), p.end(), std::back_inserter(r), [&](int n) {
+			return !q.count(n);
+		});
+		return r;
+	};
+	return {proc(sx, sy), proc(sy, sx)};
+}
diff --git a/cpp/2305/defs.h b/cpp/2305/defs.h
index 0ddf4d3..1b24ff2 100644
--- a/cpp/2305/defs.h
+++ b/cpp/2305/defs.h
@@ -2,6 +2,7 @@
 #define LEETCODE_CPP_DEFS_H
 
 #include <vector>
+#include <string>
 
 class LC230501CN {
 public:
@@ -29,4 +30,14 @@ public:
 	static bool isValid(const std::string&) noexcept;
 };
 
+class LC230503 {
+public:
+	template<typename T>
+	using V = std::vector<T>;
+	using VVI = V<V<int>>;
+	using CVIR = const V<int>&;
+
+	static VVI findDifference(CVIR, CVIR) noexcept;
+};
+
 #endif //LEETCODE_CPP_DEFS_H