diff --git a/Problem1.java b/Problem1.java
index e69de29b..68c7d009 100644
--- a/Problem1.java
+++ b/Problem1.java
@@ -0,0 +1,19 @@
+//Time Complexity: O(n)
+//Space Complexity: O(n)
+// Did this code successfully run on Leetcode :yes
+// Any problem you faced while coding this :no
+
+import java.util.HashMap;
+class Solution {
+    public int[] twoSum(int[] nums, int target) {
+        HashMap<Integer,Integer> map = new HashMap<>();
+        for(int i=0;i<nums.length;i++){
+            int difference = target-nums[i];
+            if(map.containsKey(difference)){
+                return new int[]{i,map.get(difference)};
+            }
+            map.put(nums[i],i);
+        }
+        return new int[]{};
+    }
+}
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