Grokking the Coding Interview: Patterns for Coding Questions
Ask Author
Back to course home

0% completed

Problem Challenge 2: Find the Smallest Missing Positive Number (medium)
Table of Contents

Contents are not accessible

Contents are not accessible

Contents are not accessible

Contents are not accessible

Contents are not accessible

Problem Statement

Given an unsorted array containing numbers, find the smallest missing positive number in it.

Note: Positive numbers start from '1'.

Example 1:

Input: [-3, 1, 5, 4, 2]
Output: 3
Explanation: The smallest missing positive number is '3'

Example 2:

Input: [3, -2, 0, 1, 2]
Output: 4

Example 3:

Input: [3, 2, 5, 1]
Output: 4

Example 4:

Input: [33, 37, 5]
Output: 1

Constraints:

  • 1 <= nums.length <= 10^5
  • -2<sup>31</sup> <= nums[i] <= 2<sup>31</sup> - 1

Try it yourself

Try solving this question here:

.....

.....

.....

Like the course? Get enrolled and start learning!

Table of Contents

Contents are not accessible

Contents are not accessible

Contents are not accessible

Contents are not accessible

Contents are not accessible