diff --git a/cpp/2205/220512.cpp b/cpp/2205/220512.cpp
new file mode 100644
index 0000000..891431c
--- /dev/null
+++ b/cpp/2205/220512.cpp
@@ -0,0 +1,32 @@
+#include <vector>
+#include <algorithm>
+#include <cstdio>
+
+/**
+ * 47. Permutations II
+ * Given a collection of numbers, nums, that might contain duplicates, return all possible unique permutations in any order.
+ */
+
+class Solution {
+public:
+	static std::vector<std::vector<int>> permuteUnique(std::vector<int>& nums) {
+		std::sort(nums.begin(), nums.end());
+		std::vector<std::vector<int>> ret {nums};
+		while (std::next_permutation(nums.begin(), nums.end())) {
+			ret.push_back(nums);
+		}
+		return ret;
+	}
+};
+
+int main() {
+	std::vector<int> arg {1, 1, 2};
+	auto r = Solution::permuteUnique(arg);
+	for (const auto& i : r) {
+		for (const auto& j : i) {
+			std::printf("%d ", j);
+		}
+		std::putchar('\n');
+	}
+	return 0;
+}
diff --git a/cpp/2205/CMakeLists.txt b/cpp/2205/CMakeLists.txt
index 4a7eb9c..b94ece2 100644
--- a/cpp/2205/CMakeLists.txt
+++ b/cpp/2205/CMakeLists.txt
@@ -3,4 +3,4 @@ PROJECT(2205)
 
 SET(CMAKE_CXX_STANDARD 23)
 
-ADD_EXECUTABLE(2205 220512-CN.cpp)
+ADD_EXECUTABLE(2205 220512.cpp)