Add Letcode amazon questions

Author: harshbhardwaj

Leetcode/src/com/practise/TwoSum.java

@@ -0,0 +1,33 @@
+package com.practise;
+
+import java.util.HashMap;
+import java.util.Map;
+
+public class TwoSum {
+    public static Integer[] twoSum(int[] nums, Integer target) {
+
+        Map<Integer, Integer> map = new HashMap<Integer, Integer>();
+        for(int i =0; i< nums.length ;i++){
+            if(!map.containsKey(nums[i])){
+                map.put(nums[i], i);
+            }
+        }
+
+        Integer array[] = new Integer[2];
+
+        for (Map.Entry<Integer,Integer> entry : map.entrySet())  {
+
+            int key = entry.getKey();
+            if(map.containsKey(target - key)){
+
+                array[0] = map.get(key);
+                array[1] = map.get(target-key);
+            }
+        }
+          return array;
+    }
+
+    public static void main(String[] args) {
+        TwoSum.twoSum(new int[]{2, 7, 11, 15},9);
+    }
+}