diff --git a/Problem1.java b/Problem1.java
index e69de29b..c1da9dec 100644
--- a/Problem1.java
+++ b/Problem1.java
@@ -0,0 +1,22 @@
+class Solution {
+    //T.C : O(n) n :  nums.length
+    //S.C: O(n)
+
+    public int[] twoSum(int[] nums, int target) {
+        HashMap<Integer,Integer> map = new HashMap<>();
+
+
+
+
+        for(int i = 0; i< nums.length; i++){
+             if(map.containsKey(target - nums[i])){
+                return new int[] {i, map.get(target - nums[i])};
+
+             }
+
+             map.put(nums[i], i);
+
+        }
+     return new int[] {};
+    }
+}
\ No newline at end of file