Python Interview Question 41

Published: 16 August 2024
on channel: TutorialShore

Python Interview Question 41
Given an unsorted integer array nums. Return the smallest positive integer that is not present in nums.

For example if nums = [3, 4, -1, 1]

Result is 2

Approach:

1) Filter out non-positive numbers: Since we're only interested in positive integers, we can ignore any non-positive numbers.

2) Use a set: Convert the filtered array to a set for O(1) lookup time.

3) Iterate through positive integers: Start from 1 and check if each integer is present in the set.

4) Return the first missing integer: The first integer that is not found in the set is the answer.

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