Top 20 Hashing Technique based Interview Questions Last Updated : 09 Sep, 2025 Comments Improve Suggest changes 56 Likes Like Report Hashing is a powerful technique in Data Structures and Algorithms (DSA) that involves mapping data to a fixed-size value using a hash function. The key advantage of hashing is its ability to provide fast lookups, often achieving constant time complexity, O(1), for operations like searching and inserting elements. However, a good hash function is essential to minimize collisions, where multiple inputs produce the same hash value.Easy ProblemsSubset CheckUnion and Intersection of two Linked ListsA pair with given sumTwo pair sumLargest subarray with 0 sum Distinct elements in K-size WindowPalindrome Substring Queries Missing elements of a range All subarrays with 0 sum Symmetric PairsDuplicates within k distanceMedium and Hard ProblemsFind Itinerary from a given list of ticketsLargest subarray with equal number of 0s and 1sCount Subarrays with XORLongest Consecutive SubsequencePair Sum Divisible by KSmallest Range from K ListsInternal Working of HashMap in JavaSeparate Chaining for Collision HandlingHash Table with Chaining in JavaOpen Addressing for Collision HandlingRelated LinksArticles on HashingPractice Problems on Hashing Comment K kartik 56 Improve K kartik 56 Improve Article Tags : Hash DSA Interview Questions interview-preparation placement preparation Interview-Questions +2 More Explore DSA FundamentalsLogic Building Problems 2 min read Analysis of Algorithms 1 min read Data StructuresArray Data Structure 3 min read String in Data Structure 2 min read Hashing in Data Structure 2 min read Linked List Data Structure 2 min read Stack Data Structure 2 min read Queue Data Structure 2 min read Tree Data Structure 2 min read Graph Data Structure 3 min read Trie Data Structure 15+ min read AlgorithmsSearching Algorithms 2 min read Sorting Algorithms 3 min read Introduction to Recursion 14 min read Greedy Algorithms 3 min read Graph Algorithms 3 min read Dynamic Programming or DP 3 min read Bitwise Algorithms 4 min read AdvancedSegment Tree 2 min read Binary Indexed Tree or Fenwick Tree 15 min read Square Root (Sqrt) Decomposition Algorithm 15+ min read Binary Lifting 15+ min read Geometry 2 min read Interview PreparationInterview Corner 3 min read GfG160 3 min read Practice ProblemGeeksforGeeks Practice - Leading Online Coding Platform 6 min read Problem of The Day - Develop the Habit of Coding 5 min read Like