Top 50 Two Pointers Interview Questions

Return all unique integer pairs that sum to a target using sorting or a hash-based approach.

Hash TablesArraysTwo Pointers

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MetaOpenXRecro

Find two indices in an unsorted array whose values sum to a target using a hash table in O(n) time.

Hash TablesArraysStrings

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NiCEAmazonUniversity of Utah

Use a sliding window and hash map to find the length of the longest substring without repeated characters.

Hash TablesStringsSliding Window

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Capital OneWalmartMeta

Reverse a string represented as a character array using a two-pointer approach in O(n) time.

RecursionArraysStrings

LiteratiLatchQVC

Explain a repeatable approach for solving medium LeetCode problems, including pattern recognition and time-space tradeoffs.

Hash TablesArraysTwo Pointers

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FacebookMercorUC San Diego

Determine whether a string is a palindrome using a two-pointer scan from both ends.

StringsTwo Pointers

Air Apps& General IntuitionOpenAI