diff --git "a/leetcode3/\354\240\225\354\247\204\354\230\201/219. Contains Duplicate II" "b/leetcode3/\354\240\225\354\247\204\354\230\201/219. Contains Duplicate II"
new file mode 100644
index 00000000..6f6960ba
--- /dev/null
+++ "b/leetcode3/\354\240\225\354\247\204\354\230\201/219. Contains Duplicate II"	
@@ -0,0 +1,17 @@
+/**
+ * @param {number[]} nums
+ * @param {number} k
+ * @return {boolean}
+ */
+var containsNearbyDuplicate = function(nums, k) {
+    let map = new Map();
+
+    for (let i = 0; i < nums.length; i++) {
+        if (map.has(nums[i]) && i - map.get(nums[i]) <= k) {
+            return true;
+        }
+        map.set(nums[i], i);
+    }
+
+    return false;
+};