@@ -0,0 +1,27 @@
+var permuteUnique = function (nums) {
+    nums.sort((a, b) => a - b);
+    var result = [];
+    let visited = new Array(nums.length).fill(false)
+
+    function helper(nums, visited, permutation) {
+        if (permutation.length === nums.length) {
+            result.push(permutation.slice());
+            return;
+        }
+
+        for (let i = 0; i < nums.length; i++) {
+            if (visited[i]) continue;
+            if (i > 0 && nums[i] == nums[i - 1] && !visited[i - 1]) continue;
+
+            permutation.push(nums[i]);
+            visited[i] = true;
+            helper(nums, visited, permutation)
+            visited[i] = false;
+            permutation.pop();
+        }
+
+    }
+
+    helper(nums, visited, []);
+    return result;
+};