Input: nums = [3, 6, 1, 0]
Explanation: 6 is the largest integer, and for every other number in the array x,
6 is more than twice as big as x. The index of value 6 is 1, so we return 1.
Input: nums = [1, 2, 3, 4]
Explanation: 4 isn't at least as big as twice the value of 3, so we return -1.
nums will have a length in the range [1, 50].
Every nums[i] will be an integer in the range [0, 99].