Create contains_duplicate_ii

Author: Asad4429

contains_duplicate_ii

@@ -0,0 +1,17 @@
+/**
+ * @param {number[]} nums
+ * @param {number} k
+ * @return {boolean}
+ */
+var containsNearbyDuplicate = function(nums, k) {
+    
+    const map = new Map();
+    
+    for(let i=0; i<nums.length; i++){
+        if(map.get(nums[i]) !== undefined) return true;
+        map.set(nums[i], i);
+        
+        if(i-k >= 0) map.delete(nums[i-k]);
+    }
+    return false;
+};