# 0747. Largest Number At Least Twice of Others

https://leetcode.com/problems/largest-number-at-least-twice-of-others

## Description

You are given an integer array `nums` where the largest integer is **unique**.

Determine whether the largest element in the array is **at least twice** as much as every other number in the array. If it is, return _the **index** of the largest element, or return_ `-1` _otherwise_.

**Example 1:**

```
**Input:** nums = [3,6,1,0]
**Output:** 1
**Explanation:** 6 is the largest integer.
For every other number in the array x, 6 is at least twice as big as x.
The index of value 6 is 1, so we return 1.
```

**Example 2:**

```
**Input:** nums = [1,2,3,4]
**Output:** -1
**Explanation:** 4 is less than twice the value of 3, so we return -1.
```

**Example 3:**

```
**Input:** nums = [1]
**Output:** 0
**Explanation:** 1 is trivially at least twice the value as any other number because there are no other numbers.
```

**Constraints:**

* `1 <= nums.length <= 50`
* `0 <= nums[i] <= 100`
* The largest element in `nums` is unique.

## ac

```java
```
