链接:https://leetcode-cn.com/problems/largest-number-at-least-twice-of-others/
class Solution {
public int dominantIndex(int[] nums) {
int len = nums.length;
if (len == 1)
return 0;
int max = 0;
for (int i = 1; i < len; i++) {
if (nums[max] < nums[i])
max = i;
}
for (int i : nums) {
if (nums[max] < i * 2 && nums[max] != i)
return -1;
}
return max;
}
}