• 求一個數(shù)組中兩個數(shù)的和為某個指定值
  Input: numbers={2, 7, 11, 15}, target=9
  Output: index1=1, index2=2

 /**
     *
     * @param nums
     * @param target
     * @return Input: numbers={2, 7, 11, 15}, target=9    Output: index1=1, index2=2
     */
    public static int[] twoSum(int[] nums,int target){
        final HashMap<Integer,Integer> myMap=new HashMap<>();
        for (int i=0;i<nums.length;++i){
            myMap.put(nums[i],i);
        }
        for (int i=0;i<nums.length;++i){
            final Integer v=myMap.get(target-nums[i]);
            if (null!=v && v>i){
                return new int[]{i+1,v+1};
            }
        }
        return new int[]{-1,-1};
    }