@@ -0,0 +1,429 @@
+import java.util.HashMap;%0Aimport java.util.Map;%0A%0Aclass Solution %7B%0A    public int%5B%5D twoSum(int%5B%5D nums, int target) %7B%0A        Map%3CInteger, Integer%3E map = new HashMap%3C%3E();%0A%0A        for (int i = 0; i %3C nums.length; i++) %7B%0A            if (map.containsKey(target - nums%5Bi%5D)) %7B%0A                return new int%5B%5D %7Bi, map.get(target - nums%5Bi%5D)%7D;%0A            %7D%0A            map.put(nums%5Bi%5D, i);%0A        %7D%0A%0A        return new int%5B2%5D;%0A    %7D%0A%7D%0A

1. Two Sum