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# 1133. Largest Unique Number

Given an array of integers `A`, return the largest integer that only occurs once.

If no integer occurs once, return -1.

Example 1:

```Input: [5,7,3,9,4,9,8,3,1]
Output: 8
Explanation:
The maximum integer in the array is 9 but it is repeated. The number 8 occurs only once, so it's the answer.
```

Example 2:

```Input: [9,9,8,8]
Output: -1
Explanation:
There is no number that occurs only once.
```

Note:

1. `1 <= A.length <= 2000`
2. `0 <= A[i] <= 1000`

Easy

Prime

Amazon

### Problem Solution

1133-Largest-Unique-Number

### All Problems:

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