Top 10 Algorithms in Interview Questions Last Updated : 25 Feb, 2025 Comments Improve Suggest changes Like Article Like Report Getting ready for a tech job interview? Algorithms are really important! Companies often ask questions that require problem-solving skills. In this article, we'll look at the top 10 algorithms commonly used in interviews. Each algorithm is like a powerful tool in your problem-solving toolbox. Knowing them well can really help you handle different technical challenges during interviews. Let's break down these important algorithms to make your interview preparation more effective. If you're getting ready for a coding interview, it's essential to go through these problems.1. Array AlgorithmMaximum Subarray SumFind the Missing NumberTrapping Rain WaterMaximum Product SubarrayFind the equilibrium index of an arrayLeaders in an arrayMinimum Platforms Required for a Railway/Bus StationRotate an array to the right by k stepsKth smallest/largest element in an arrayMaximum Length Bitonic SubarrayFor more, please refer: Array Data Structure Guide2. String AlgorithmLongest Palindromic SubstringString Matching with WildcardEdit DistanceLongest Repeating SubsequenceCount all distinct substrings of a given stringReverse words in a given stringCheck if a string is a rotated palindromeKMP Algorithm for Pattern SearchingMinimum characters to be added at front to make string palindromeFor more, please refer: String Data Structure3. Sorting AlgorithmQuickSortMergeSortHeapSortCounting SortRadix SortBubble SortSelection SortInsertion SortShell SortBucket SortFor more, please refer: Sorting Algorithms4. Searching AlgorithmLinear SearchBinary SearchTernary SearchDepth-First Search (DFS)Breadth-First Search (BFS)Fibonacci SearchFor more, please refer: Searching Algorithms5. Recursion/Backtracking AlgorithmN-Queens ProblemSudoku SolverRat in a MazeWord Break Problem using BacktrackingSubset Sum ProblemPermutations of a given stringCombination SumGenerate all possible valid IP addresses from given stringRat in a Maze with multiple steps or jump allowedFor more, please refer: Recursion/Backtracking Algorithm6. Greedy AlgorithmFractional KnapsackHuffman CodingJob Sequencing with DeadlinesActivity Selection ProblemGreedy Algorithm to find Minimum number of CoinsMinimum Number of Platforms Required for a Railway/Bus StationMaximum Length Chain of PairsMinimize Cash Flow among a given set of friends who have borrowed money from each otherConnect n Ropes with Minimum CostPrim's Minimum Spanning Tree (MST)For more, please refer: Greedy Algorithms7. Tree AlgorithmLowest Common Ancestor (LCA)Diameter of Binary TreeBinary Tree Level Order TraversalSerialize and Deserialize a Binary TreeCheck if a Binary Tree is BSTInorder Traversal without RecursionConvert Binary Tree to Doubly Linked ListCheck if Two Trees are IdenticalMaximum Width of a Binary TreeMirror of a Binary TreeFor more, please refer: Tree Data Structure8. Dynamic Programming AlgorithmLongest Common Subsequence0/1 KnapsackMatrix Chain MultiplicationLongest Increasing SubsequenceMaximum Sum Increasing SubsequenceCoin Change ProblemLongest Palindromic SubsequenceEdit DistanceLargest Sum Contiguous SubarrayLongest Common SubstringFor more, please refer: Dynamic Programming9. Graph AlgorithmDijkstra's AlgorithmKruskal's AlgorithmTopological SortingBellman-Ford AlgorithmFloyd Warshall AlgorithmPrim's AlgorithmDepth-First Traversal of a GraphBreadth-First Traversal of a GraphDetect Cycle in a Directed GraphArticulation Points (or Cut Vertices) in a GraphFor more, please refer: Graph Algorithms10. Bit Manipulation AlgorithmFind the Only Non-Repeating ElementCount Total Set BitsMaximum XOR of Two Numbers in an ArrayFind the two non-repeating elements in an array of repeating elementsCheck if a number is sparse or notCount total set bits in all numbers from 1 to nMaximum subarray XOR in a given arraySum of XOR of all subarraysFind the element that appears once in an array where every other element appears twiceProgram to find whether a no is power of twoFor more, please refer: Bitwise AlgorithmsRelated Articles:Top 50 Array Coding Problems for InterviewsTop 50 String Coding Problems for InterviewsTop 50 Problems on Heap Data for InterviewsTop 50 Tree Coding Problems for InterviewsTop 50 Dynamic Programming Coding ProblemsTop 50 Graph Coding Problems for InterviewsTop 50 Problems on Stack Problems for InterviewsTop 50 Problems on Linked List Problems for InterviewsTop 50 Problems on Matrix/Grid Problems for InterviewsMust Do Coding Questions for Product Based CompaniesMust Do Coding Questions for Companies like Amazon Comment More infoAdvertise with us K kartik Follow Improve Article Tags : Algorithms Data Structures DSA Interview Questions Interview Tips interview-preparation placement preparation BFS DFS Topological Sorting Interview-Questions +7 More Practice Tags : AlgorithmsBFSData StructuresDFS Similar Reads 30 OOPs Interview Questions and Answers [2025 Updated] Object-oriented programming, or OOPs, is a programming paradigm that implements the concept of objects in the program. 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