Two Pointers — JavaScript Interview Practice

Two Pointers

Solve problems using two pointers to traverse arrays.

Topics in the full lesson

Concept and Use Cases
When to Use
Time and Space Complexity
Pair with Target Sum in a Sorted Array
Removing Duplicates from a Sorted Array
Checking if a String is a Palindrome

Practice Problems

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Squares of a Sorted Array

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Question

Given an integer array nums sorted in non-decreasing order, return an array of the squares of each number, sorted in non-decreasing order. Solve in O(n) using two pointers.

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Explain your reasoning or try an implementation before comparing answers.

Practice on LeetCode

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