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1133. Largest Unique Number

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Description

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

Solutions

Python3

Java

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