747. Largest Number At Least Twice of Others.java

class Solution {
    public int dominantIndex(int[] nums) {
        if (nums.length == 1)
            return 0;
        int result = 0;
        int max_1 = nums[0];
        int max_2 = Integer.MIN_VALUE;
        for (int i = 1; i < nums.length; i++) {
            if (nums[i] > max_1) {
                max_2 = max_1;
                max_1 = nums[i];
                result = i;
            } else if (nums[i] > max_2) {
                max_2 = nums[i];
            }
        }
        if (max_1 - max_2 * 2 >= 0)
            return result;
        else
            return -1;
    }
}