diff --git "a/problems/0090.\345\255\220\351\233\206II.md" "b/problems/0090.\345\255\220\351\233\206II.md"
index 16bd1f2c19..d08707b4f6 100644
--- "a/problems/0090.\345\255\220\351\233\206II.md"
+++ "b/problems/0090.\345\255\220\351\233\206II.md"
@@ -87,7 +87,7 @@ class Solution {
 private:
     vector<vector<int>> result;
     vector<int> path;
-    void backtracking(vector<int>& nums, int startIndex, vector<bool>& used) {
+    void backtracking(vector<int>& nums, int startIndex) {
         result.push_back(path);
         unordered_set<int> uset;
         for (int i = startIndex; i < nums.size(); i++) {
@@ -96,7 +96,7 @@ private:
             }
             uset.insert(nums[i]);
             path.push_back(nums[i]);
-            backtracking(nums, i + 1, used);
+            backtracking(nums, i + 1);
             path.pop_back();
         }
     }
@@ -105,9 +105,8 @@ public:
     vector<vector<int>> subsetsWithDup(vector<int>& nums) {
         result.clear();
         path.clear();
-        vector<bool> used(nums.size(), false);
         sort(nums.begin(), nums.end()); // 去重需要排序
-        backtracking(nums, 0, used);
+        backtracking(nums, 0);
         return result;
     }
 };