First Unique Element Index | Dataford Interview Questions

Given an array of integers nums, return the index of the first element that appears exactly once in the array. If no such element exists, return -1. The input is a Python list of integers, and the output is a single integer index.

Constraints

1 <= len(nums) <= 10^5
-10^9 <= nums[i] <= 10^9
The solution should run efficiently for large arrays

Function Signature

def first_unique_index(nums):

Your question is First Unique Element Index. Start with the requirements in the Question tab.

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Problem

Constraints

1 <= len(nums) <= 10^5
-10^9 <= nums[i] <= 10^9
The solution should run efficiently for large arrays

Function Signature

def first_unique_index(nums):

Your question is First Unique Element Index. Start with the requirements in the Question tab.

Run and submit as often as you like. When you're ready, talk me through your approach or go straight to the code.