Merge pull request #776 from paragon0107/main

Week3

Author: SamTheKorean

two-sum/paragon0107.java

@@ -0,0 +1,21 @@
+
+import java.util.HashMap;
+import java.util.Map;
+
+class Solution {
+    public int[] twoSum(int[] nums, int target) {
+        Map<Integer, Integer> map = new HashMap<>();
+        for(int i =0;i<nums.length;i++){
+            map.put(nums[i], i);
+        }
+
+        for(int i = 0;i<nums.length;i++){
+            int b = target - nums[i];
+            if(map.containsKey(b) && map.get(b) != i){
+                int j = map.get(b);
+                return new int[]{i,j};
+            }
+        }
+        return null;
+    }
+}