747. 至少是其他数字两倍的最大数

class Solution {
    public int dominantIndex(int[] nums) {


        if (nums.length == 1) {
            return 0;
        }
        int max = 0;
        int then = 1;

        if (nums[0] < nums[1]) {
            max = 1;
            then = 0;
        }
        
        for (int i = 2; i < nums.length; i++) {

            if (nums[i] > nums[max]) {
                then = max;
                max = i;
            } else if (nums[i] > nums[then]){
                then = i;
            }
        }

        if (nums[max] >= nums[then] + nums[then]) {
            return max;
        }
        return -1;

    }
}