Top 50 Two Pointers Interview Questions
The most frequently asked Two Pointers questions across all roles and companies, ranked by real interview frequency. Updated daily.
Find the longest substring with all unique characters using a sliding window.
DeepInstinct
Taboola
EDF RenewablesUse a hash map to find two array elements that sum to a target in O(n) time.
EtsyLLuxoft Singapore
NeoDoctoUse a sliding window and hash map to find the longest substring without repeated characters in a string.
Insight Global
O'Reilly Media
AvisoFind two indices in an array whose values add up to a target using a hash map.
Converseon
Earnest ResearchEtsyUse Floyd’s two-pointer algorithm to determine whether a singly linked list contains a cycle.
Sigmoid
AMD Construction Group
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Use a two-pointer string scan to determine whether a string reads the same forward and backward.
Dsv Air & Sea
Lucid Motors
AfterqueryUse two pointers to determine whether a City National Bank reference label reads identically forward and backward.
Taboola
iHerb
SharpSpring