看到好多人在刷题，俺也来试试，看看能坚持多久
数组

public class SumOfTwoNumber {
    public static void main(String[] args) {
            int[] nums = {1,2,3,7,4};
        int[] ints = twoSum(nums, 8);
        System.out.println("["+ints[0]+","+ints[1]+"]");

    }
    static int[] twoSum(int[] nums, int target) {
        int[] indexs = new int[2];
        //建立k-v，将值存进去
        Map<Integer, Integer> map = new HashMap<Integer, Integer>();
        for (int i = 0; i < nums.length; i++) {
            Integer integer = Integer.valueOf(nums[i]);
            if(map.containsKey(nums[i])){
                indexs[0] = i;
                indexs[1] = map.get(integer);
            }
            map.put(target - nums[i],i);
        }
        return indexs;
    }
}