## Top Collection of Coding Interview Questions

## Array, String and Some Data Structure

- Find pair with given sum in the array
- Check if subarray with 0 sum is exists or not
- Print all sub-arrays with 0 sum
- Sort binary array in linear time
- Find a duplicate element in a limited range array
- Find maximum length sub-array having given sum
- Find maximum length sub-array having equal number of 0’s and 1’s
- Find maximum product of two integers in an array
- Sort an array containing 0’s, 1’s and 2’s (Dutch National Flag Problem)
- In place merge two sorted arrays
- Merge two arrays by satisfying given constraints
- Find index of 0 to replace to get maximum length sequence of continuous ones
- Shuffle a given array of elements (Fisher–Yates shuffle)
- Rearrange the array with alternate high and low elements
- Find equilibrium index of an array
- Find largest sub-array formed by consecutive integers
- Find majority element (Boyer–Moore Majority Vote Algorithm)
- Move all zeros present in the array to the end
- Replace each element of array with product of every other element without using / operator
- Find Longest Bitonic Subarray in an array
- Longest Increasing Subsequence
- Find maximum difference between two elements in the array by satisfying given constraints
- Maximum Sum Subarray Problem (Kadane’s Algorithm)
- Print continuous subarray with maximum sum
- Maximum Sum Circular Subarray
- Find all distinct combinations of given length — I
- Find all distinct combinations of given length with repetition allowed
- Find maximum sequence of continuous 1’s formed by replacing at-most k zeroes by ones
- Find minimum sum subarray of given size k
- Find maximum product subarray in a given array
- Find subarray having given sum in given array of integers
- Find the length of smallest subarray whose sum of elements is greater than the given number
- Find largest number possible from set of given numbers
- Find the smallest window in array sorting which will make the entire array sorted
- Find maximum sum path involving elements of given arrays
- Maximum profit earned by buying and selling shares any number of times
- Trapping Rain Water within given set of bars
- Find minimum platforms needed in the station so to avoid any delay in arrival of any train
- Decode the array constructed from another array
- Sort an array using one swap
- Find Triplet with given sum in an array
- Length of longest continuous sequence with same sum in given binary arrays
- Reverse every consecutive m elements of the given subarray
- Maximum Product Subset Problem
- Find pairs with given difference k in the array
- Find pairs with given difference k in the array | Constant space solution
- 4 sum problem | Quadruplets with given sum
- Print all quadruplets with given sum | 4-sum problem extended
- Quickselect Algorithm
- Rearrange array such that A[A[i]] is set to i for every element A[i]
- Print all Triplets that forms Arithmetic Progression
- Print all Triplets that forms Geometric Progression
- Print all combination of numbers from 1 to n having sum n
- Replace each element of the array by its corresponding rank in the array
- Print all Triplets in an array with sum less than or equal to given number
- Group elements of an array based on their first occurrence
- Find minimum difference between index of two given elements present in the array
- Find maximum absolute difference between sum of two non-overlapping sub-arrays
- Find all Symmetric Pairs in an Array of Pairs
- Partition an array into two sub-arrays with the same sum
- Find count of distinct elements in every sub-array of size k
- Find two numbers with maximum sum formed by array digits
- Print all sub-arrays of an array having distinct elements
- Find a Triplet having Maximum Product in an Array
- Find Minimum Index of Repeating Element in an Array
- Generate random input from an array according to given probabilities
- Find pair in an array having minimum absolute sum
- Find Index of Maximum Occurring Element with Equal Probability
- Check if an Array is Formed by Consecutive Integers
- Find two non-overlapping pairs having same sum in an array
- Add elements of two arrays into a new array
- Find Minimum Product among all Combinations of Triplets in an Array
- Replace every element of an array with the least greater element on its right
- Find all odd occurring elements in an array having limited range of elements
- Count the distinct absolute values in the sorted array
- Print all combinations of positive integers in increasing order that sum to a given number
- Find all distinct combinations of given length — II
- Find subarrays with given sum in an array
- Find the surpasser count for each element of an array
- Find maximum length sequence of continuous ones (Using Sliding Window)
- Find maximum length sequence of continuous ones
- Find index that divides an array into two non-empty subarrays of equal sum
- Calculate frequency of all elements present in an array of specified range
- Rearrange the array such that it contains positive and negative numbers at alternate positions
- Find a sorted triplet in the given array
- Shuffle an array according to the given order of elements
- Count number of strictly increasing sub-arrays in an array
- Find duplicates within given range k in an array
- Longest Alternating Subarray Problem
- Find minimum range with at-least one element from each of the given arrays
- Find longest subsequence formed by consecutive integers
- Find all elements in an array that are greater than all elements present to their right
- Find missing number in array without using extra space
- Determine index of an element in given array which satisfies given constraints
- Find minimum moves required for converting a given array to an array of zeroes
- Left rotate an array
- Right rotate an array k times
- Find maximum profit earned from at most two stock transactions
- Find Frequency of each element in a sorted array containing duplicates
- Find Minimum and Maximum element in an array using minimum comparisons
- Difference between Subarray, Subsequence and Subset
- Find odd occurring element in an array in single traversal
- Find odd occurring element in logarithmic time
- Find two odd occurring elements in an array without using any extra space
- Check if given array represents min heap or not
- Find K’th smallest element in an array
- Find K’th largest element in an array
- Sort a K-Sorted Array
- Merge M sorted lists of variable length
- Find smallest range with at-least one element from each of the given lists
- Merge M sorted lists each containing N elements
- Find maximum sum of subsequence with no adjacent elements
- Find ways to calculate a target from elements of specified array
- Sort elements by their frequency and Index
- Sort an array based on order defined by another array
- Inversion Count of an array
- Segregate positive and negative integers in linear time
- Find number of rotations in a circularly sorted array
- Search an element in a circular sorted array
- Find first or last occurrence of a given number in a sorted array
- Count occurrences of a number in a sorted array with duplicates
- Find smallest missing element from a sorted array
- Find Floor and Ceil of a number in a sorted array
- Search in a nearly sorted array in logarithmic time
- Find number of 1’s in a sorted binary array
- Find Missing Term in a Sequence in Logarithmic time
- Find missing number and duplicate elements in an array
- Find the peak element in an array
- Find Floor and Ceil of a number in a sorted array (Recursive solution)
- Print all distinct subsets of a given set
- Find two duplicate elements in a limited range array (using XOR)
- Combinations of words formed by replacing given numbers with corresponding alphabets
- 0–1 Knapsack Problem
- Subset sum Problem
- Partition Problem
- 3-Partition Problem
- 3-partition problem extended | Print all partitions
- K-Partition Problem | Printing all Partitions
- Minimum Sum Partition Problem
- Rod Cutting
- Longest Alternating Subsequence Problem
- Coin change-making problem (unlimited supply of coins)
- Coin Change Problem — Find total number of ways to get the denomination of coins
- Find maximum profit earned from at most K stock transactions
- Want to read this story later? Save it in Journal.
- Backtracking
- Print all possible solutions to N Queens Problem
- Print all Possible Knight’s Tours in a chessboard
- Find Shortest Path in Maze
- Find Longest Possible Route in a Matrix
- Find path from source to destination in a matrix that satisfies given constraints
- Find total number of unique paths in a maze from source to destination
- Print All Hamiltonian Path present in a graph
- Print all k-colorable configurations of the graph (Vertex coloring of graph)
- Find all Permutations of a given string
- All combinations of elements satisfying given constraints
- Find all binary strings that can be formed from given wildcard pattern
- K-Partition Problem | Printing all Partitions
- Magnet Puzzle
- Find ways to calculate a target from elements of specified array
- Find minimum number possible by doing at-most K swaps
- Determine if a pattern matches with a string or not
- Generate list of possible words from a character matrix
- Find the path between given vertices in a directed graph
- Find all Possible Topological Orderings of a DAG
- Print all shortest routes in a rectangular grid
- Binary
- Bit Hacks — Part 1 (Basic)
- Bit Hacks — Part 2 (Playing with k’th bit)
- Bit Hacks — Part 3 (Playing with rightmost set bit of a number)
- Bit Hacks — Part 4 (Playing with letters of English alphabet)
- Bit Hacks — Part 5 (Find absolute value of an integer without branching)
- Bit Hacks — Part 6 (Random Problems)
- Brian Kernighan’s Algorithm to count set bits in an integer
- Round up to the next highest power of 2
- Round up to the previous power of 2
- Compute parity of a number using lookup table
- Count set bits using lookup table
- Find the minimum or maximum of two integers without using branching
- Multiply 16-bit integers using 8-bit multiplier
- Swap individual bits at given position in an integer
- Check if given number is power of 4 or not
- Check if given number is power of 8 or not
- Reverse Bits of a given Integer
- Find odd occurring element in an array in single traversal
- Find two odd occurring elements in an array without using any extra space
- Swap two bits at given position in an integer
- Add binary representation of two integers
- Swap Adjacent Bits of a Number
- Print all distinct subsets of a given set
- Perform Division of two numbers without using division operator (/)
- Check if adjacent bits are set in binary representation of a given number
- Conditionally negate a value without branching
- Find two duplicate elements in a limited range array (using XOR)
- Reverse Bits of an integer using lookup table
- Find missing number and duplicate elements in an array
- Circular shift on binary representation of an integer by k positions
- Compute modulus division without division and modulo operator
- Solve given set of problems without using multiplication or division operators
- Find XOR of two numbers without using XOR operator
- Generate power set of a given set
- Huffman Coding
- Find missing number in array without using extra space
- Find odd occurring element in logarithmic time
- Find all odd occurring elements in an array having limited range of elements
- Binary Tree
- Check if two given binary trees are identical or not
- Calculate height of a binary tree
- Delete given Binary Tree
- Inorder Tree Traversal (Iterative & Recursive Implementation)
- Preorder Tree Traversal (Iterative & Recursive Implementation)
- Postorder Tree Traversal (Iterative & Recursive Implementation)
- Level Order Traversal of Binary Tree
- Spiral Order Traversal of Binary Tree
- Reverse Level Order Traversal of Binary Tree
- Print all nodes of a given binary tree in specific order
- Print left view of binary tree
- Print Bottom View of Binary Tree
- Print Top View of Binary Tree
- Find next node in same level for given node in a binary tree
- Check if given binary tree is complete binary tree or not
- In-place convert given binary tree to its sum tree
- Determine if given two nodes are cousins of each other
- Print cousins of given node in a binary tree
- Check if given binary tree is a sum tree or not
- Combinations of words formed by replacing given numbers with corresponding alphabets
- Determine if given binary tree is a subtree of another binary tree or not
- Find diameter of a binary tree
- Check if given binary Tree has symmetric structure or not
- Convert binary tree to its mirror
- Check if binary tree can be converted to another by doing any no. of swaps of left & right child
- Find Lowest Common Ancestor (LCA) of two nodes in a binary tree
- Print all paths from root to leaf nodes in a binary tree
- Find ancestors of given node in a Binary Tree
- Find the distance between given pairs of nodes in a binary tree
- Find Vertical Sum in a given Binary Tree
- Perform vertical traversal of a binary tree — I
- Perform vertical traversal of a binary tree — II
- Print corner nodes of every level in binary tree
- Find the diagonal sum of given binary tree
- Print Diagonal Traversal of Binary Tree
- In-place convert Binary Tree to Doubly Linked List
- Sink nodes containing zero to the bottom of the binary tree
- Convert given binary tree to full tree by removing half nodes
- Truncate given binary tree to remove nodes which lie on a path having sum less than K
- Find maximum sum root-to-leaf path in a binary tree
- Check if given binary tree is height balanced or not
- Find maximum width of given binary tree
- Convert normal binary tree to Left-child right-sibling binary tree
- Determine if given Binary Tree is a BST or not
- Convert a Binary Tree to BST by maintaining its original structure
- Invert a Binary Tree
- Print Right View of a Binary Tree
- Print all paths from leaf to root node in given binary tree
- Iteratively print leaf to root path for every leaf node in a binary tree
- Build Binary Tree from given Parent array
- Find all nodes at given distance from leaf nodes in a binary tree
- Count all subtrees having same value of nodes in a binary tree
- Find Maximum Difference Between a Node and its Descendants in a Binary Tree
- Construct a Binary Tree from Ancestor Matrix
- Calculate height of a binary tree with leaf nodes forming a circular doubly linked list
- Find maximum sum path between two leaves in a binary tree
- Fix a binary tree that is only one swap away from becoming a BST
- Construct a binary tree from inorder and preorder traversal
- Construct a binary tree from inorder and postorder traversals
- Construct a binary tree from inorder and level order sequence
- Construct a full binary tree from preorder sequence with leaf node information
- Construct a full binary tree from a preorder and postorder sequence
- Set next pointer to inorder successor of all nodes in binary tree
- Efficiently print all nodes between two given levels in a binary tree
- Find preorder traversal of a binary tree from its inorder and postorder sequence
- Find the difference between sum of all nodes present at odd and even levels in a binary tree
- Find the size of the largest BST in a Binary Tree
- Link nodes present in each level of a binary tree in the form of a linked list
- Construct a Cartesian Tree from In-order Traversal
- Implementation of Treap Data Structure (Insert, Search and Delete)
- Clone a binary tree with random pointers
- Threaded Binary Tree: Overview and Implementation
- Invert alternate levels of a perfect binary tree
- Convert a Binary Tree into a Doubly Linked List in Spiral Order
- Check if a binary tree is a min-heap or not
- Determine if a binary tree satisfy the height-balanced property of red–black tree
- Depth first search (DFS) vs Breadth first search (BFS)
- BST
- Insertion in BST
- Search given key in BST
- Deletion from BST
- Construct balanced BST from given keys
- Determine if given Binary Tree is a BST or not
- Check if given keys represents same BSTs or not without building the BST
- Find inorder predecessor for given key in a BST
- Find Lowest Common Ancestor (LCA) of two nodes in a Binary Search Tree
- Find K’th smallest and K’th largest element in BST
- Floor and Ceil in a Binary Search Tree
- Find optimal cost to construct binary search tree
- Convert a Binary Tree to BST by maintaining its original structure
- Remove nodes from BST that have keys outside the valid range
- Find a pair with given sum in a BST
- Find inorder successor for given key in a BST
- Replace every element of an array with the least greater element on its right
- Fix a binary tree that is only one swap away from becoming a BST
- Update every key in BST to contain sum of all greater keys
- Check if a given sequence represents preorder traversal of a BST
- Build a Binary Search Tree from a Postorder Sequence
- Build a Binary Search Tree from a Preorder Sequence
- Find a triplet with given sum in a BST
- Count subtrees in a BST whose nodes lies within a given range
- Merge two BSTs into a doubly linked list in sorted order
- Construct a height-balanced BST from an unbalanced BST
- Find the size of the largest BST in a Binary Tree
- Convert a Binary Search Tree into a Min Heap
- Construct a Height-Balanced BST from a Sorted Doubly Linked List
- Divide & Conquer
- Binary Search Algorithm
- Find number of rotations in a circularly sorted array
- Search an element in a circular sorted array
- Find first or last occurrence of a given number in a sorted array
- Count occurrences of a number in a sorted array with duplicates
- Find smallest missing element from a sorted array
- Find Floor and Ceil of a number in a sorted array
- Search in a nearly sorted array in logarithmic time
- Find number of 1’s in a sorted binary array
- Find the peak element in an array
- Maximum Sum Subarray using Divide & Conquer
- Efficiently implement a power function
- Find Missing Term in a Sequence in Logarithmic time
- Division of Two Numbers using Binary Search Algorithm
- Find Floor and Ceil of a number in a sorted array (Recursive solution)
- Find Frequency of each element in a sorted array containing duplicates
- Find odd occurring element in logarithmic time
- Ternary Search vs Binary search
- Exponential search
- Unbounded Binary Search
- Interpolation search
- Merge Sort Algorithm
- QuickSort Algorithm
- Dynamic Programming
- Introduction to Dynamic Programming
- Longest Common Subsequence Problem
- Longest Common Subsequence | Space optimized version
- Longest Common Subsequence of K-sequences
- Longest Common Subsequence | Finding all LCS
- Longest Common Substring Problem
- Longest Palindromic Subsequence Problem
- Longest Repeated Subsequence Problem
- Implement Diff Utility
- Shortest Common Supersequence Problem
- Shortest Common Supersequence | Finding all SCS
- Shortest Common Supersequence Problem using LCS
- Longest Increasing Subsequence Problem
- Longest Decreasing Subsequence Problem
- Longest Bitonic Subsequence
- Increasing Subsequence with Maximum Sum
- The Levenshtein Distance (Edit Distance) Problem
- Find size of largest square sub-matrix of 1’s present in given binary matrix
- Matrix Chain Multiplication
- Find the minimum cost to reach last cell of the matrix from its first cell
- Find longest sequence formed by adjacent numbers in the matrix
- Count number of paths in a matrix with given cost to reach destination cell
- 0–1 Knapsack Problem
- Maximize value of the expression
- Partition Problem
- Subset sum Problem
- 3-Partition Problem
- Minimum Sum Partition Problem
- Rod Cutting
- Maximum Product Rod Cutting
- Coin change-making problem (unlimited supply of coins)
- Coin Change Problem — Find total number of ways to get the denomination of coins
- Total possible solutions to linear equation of k variables
- Longest Alternating Subsequence Problem
- Count number of times a pattern appears in given string as a subsequence
- Collect maximum points in a matrix by satisfying given constraints
- Find all N-digit binary strings without any consecutive 1’s
- Count total possible combinations of N-digit numbers in a mobile keypad
- Word Break Problem
- Determine Minimal Adjustment Cost of an Array
- Check if a string is K-Palindrome or not
- Find total ways to achieve given sum with n throws of dice having k faces
- Wildcard Pattern Matching
- Find number of ways to fill a N x 4 matrix with 1 x 4 tiles
- Ways to reach the bottom-right corner of a matrix with exactly k turns allowed
- Weighted Interval Scheduling Problem
- Box Stacking Problem
- Find total ways to reach the n’th stair with at-most m steps
- Find total ways to reach the n’th stair from the bottom
- Activity Selection Problem
- Find minimum number of deletions required to convert a string into palindrome
- Calculate minimum cost to reach destination city from source city
- Pots of Gold Game Problem
- Find minimum cuts needed for palindromic partition of a string
- Weighted Interval Scheduling using LIS algorithm
- Find minimum jumps required to reach the destination
- Find probability that a person is alive after taking N steps on the island
- Find maximum sum of subsequence with no adjacent elements
- Maximum Length Snake Sequence
- Calculate size of the largest plus of 1’s in binary matrix
- Longest Increasing Subsequence using LCS
- Find maximum profit earned from at most K stock transactions
- Count all paths in a matrix from first cell to last cell
- Check if a string matches with a given wildcard pattern
- Check if given string is interleaving of two other given strings
- Find all employees who directly or indirectly reports to a manager
- Find optimal cost to construct binary search tree
- Find maximum sum of subsequence with no adjacent elements
- Maximum Sum Subarray Problem (Kadane’s Algorithm)
- Longest Alternating Subarray Problem
- Collect maximum value of coins in a matrix
- Find length of longest path in the matrix with consecutive characters
- Find ways to calculate a target from elements of specified array
- Calculate sum of all elements in a sub-matrix in constant time
- Find maximum sum K x K sub-matrix in a given M x N matrix
- Find maximum sum submatrix present in a given matrix
- Single-Source Shortest Paths — Bellman Ford Algorithm
- All-Pairs Shortest Paths — Floyd Warshall Algorithm
- Graph
- Terminology and Representations of Graphs
- Graph Implementation — C, C++, C++ (STL), Java (Collections), Python
- Breadth First Search (BFS) Algorithm
- Depth First Search (DFS) Algorithm
- Depth first search (DFS) vs Breadth first search (BFS)
- Arrival and Departure Time of Vertices in DFS
- Types of edges involved in DFS and relation between them
- Bipartite Graph
- Determine if a given graph is Bipartite Graph using DFS
- Snake and Ladder Problem
- Topological Sorting in a DAG
- Kahn’s Topological Sort Algorithm
- Transitive Closure of a Graph
- Check if an undirected graph contains cycle or not
- Total paths in given digraph from given source to destination having exactly m edges
- Determine if an undirected graph is a Tree (Acyclic Connected Graph)
- 2-Edge Connectivity in the graph
- 2-Vertex Connectivity in the graph
- Check if given digraph is a DAG (Directed Acyclic Graph) or not
- Disjoint-Set Data Structure (Union-Find Algorithm)
- Chess Knight Problem — Find Shortest path from source to destination
- Check if given Graph is Strongly Connected or not
- Check if given Graph is Strongly Connected or not using one DFS Traversal
- Union-Find Algorithm for Cycle Detection in undirected graph
- Kruskal’s Algorithm for finding Minimum Spanning Tree
- Single-Source Shortest Paths — Dijkstra’s Algorithm
- Single-Source Shortest Paths — Bellman Ford Algorithm
- All-Pairs Shortest Paths — Floyd Warshall Algorithm
- Find Cost of Shortest Path in DAG using one pass of Bellman-Ford
- Least Cost Path in Weighted Digraph using BFS
- Find maximum cost path in graph from given source to destination
- Determine negative-weight cycle in a graph
- Least cost path in given digraph from given source to destination having exactly m edges
- Find the path between given vertices in a directed graph
- Find all Possible Topological Orderings of a DAG
- Find the correct order of alphabets in a given dictionary of ancient origin
- Find longest path in a Directed Acyclic Graph (DAG)
- Construct a directed graph from undirected graph that satisfies given constraints
- Print all k-colorable configurations of the graph (Vertex coloring of graph)
- Print All Hamiltonian Path present in a graph
- Graph Coloring Problem
- Greedy
- Activity Selection Problem
- Huffman Coding
- Job Sequencing Problem with Deadlines
- Graph Coloring Problem
- Kruskal’s Algorithm for finding Minimum Spanning Tree
- Single-Source Shortest Paths — Dijkstra’s Algorithm
- Shortest Superstring Problem
- Heap
- Introduction to Priority Queues using Binary Heaps
- Min Heap and Max Heap Implementation — C++, Java
- Heap Sort Algorithm
- Check if given array represents min heap or not
- Convert Max Heap to Min Heap in linear time
- Find K’th largest element in an array
- Sort a K-Sorted Array
- Merge M sorted lists of variable length
- Merge K sorted linked lists
- Find K’th smallest element in an array
- Find smallest range with at-least one element from each of the given lists
- Merge M sorted lists each containing N elements
- Find first k non-repeating characters in a string in single traversal
- Find first k maximum occurring words in given set of strings
- Implementation of Treap Data Structure (Insert, Search and Delete)
- Convert a Binary Search Tree into a Min Heap
- Check if a binary tree is a min-heap or not
- Huffman Coding
- External Merge Sort Algorithm
- Linked List
- Introduction to Linked Lists
- Linked List Implementation — C, C++, Java, Python
- Linked List | Insertion at Tail
- Static Linked List
- Clone given Linked List
- Delete Linked List
- Pop operation in linked list
- Insert given node into the correct sorted position in the given sorted linked list
- Rearrange linked list in increasing order (Sort linked list)
- Split the nodes of the given linked list into front and back halves
- Remove duplicates from a sorted linked list
- Move front node of the given list to the front of the another list
- Move even nodes to the end of the list in reverse order
- Split given linked list into two lists where each list containing alternating elements from it
- Construct a linked list by merging alternate nodes of two given lists
- Merge Sort Algorithm for Singly Linked List
- Merge two sorted linked lists into one
- Merge K sorted linked lists
- Intersection of two given sorted linked lists
- Reverse Linked List (Iterative Solution)
- Reverse Linked List (Recursive Solution)
- Reverse every group of k nodes in given linked list
- Find K’th node from the end in a linked list
- Merge alternate nodes of two linked lists into the first list
- Merge two sorted linked lists from their end
- Delete every N nodes in a linked list after skipping M nodes
- Rearrange linked list in specific manner in linear time
- Check if linked list is palindrome or not
- Move last node to front in a given Linked List
- Rearrange the linked list in specific manner
- Detect Cycle in a linked list (Floyd’s Cycle Detection Algorithm)
- Sort linked list containing 0’s, 1’s and 2’s
- Implement Stack using Linked List
- Implement Queue using Linked List
- Remove duplicates from a linked list
- Rearrange the linked list so that it has alternating high, low values
- Rearrange a Linked List by Separating Odd Nodes from the Even Ones
- Calculate height of a binary tree with leaf nodes forming a circular doubly linked list
- XOR Linked List: Overview and Implementation
- Convert a multilevel linked list to a singly linked list
- Recursively check if linked list of characters is palindrome or not
- Merge two BSTs into a doubly linked list in sorted order
- Remove redundant nodes from a path formed by a linked list
- Add a single-digit number to a linked list representing a number
- Reverse every alternate group of k nodes in a linked list
- Determine if a given linked list is a palindrome or not
- Sort a Doubly Linked List using Merge Sort
- Reverse a Doubly Linked List
- Pairwise swap adjacent nodes of a linked list
- Flatten a linked list
- Check if a Linked List of String is Palindromic
- Flatten a multilevel linked list
- Construct a height-balanced BST from an unbalanced BST
- Swap K’th node from beginning with K’th node from end in a Linked List
- Add two linked lists without using any extra space
- Clone a Linked List with Random Pointers
- Update random pointer for each linked list node to point to the maximum node
- Link nodes present in each level of a binary tree in the form of a linked list
- Convert a Ternary Tree to a Doubly Linked List
- Print nodes of a given binary tree in vertical order
- Convert a Binary Tree into a Doubly Linked List in Spiral Order
- Construct a Height-Balanced BST from a Sorted Doubly Linked List
- In-place merge two sorted linked lists without modifying links of the first list
- Reverse specified portion of a Linked List
- Matrix
- Print Matrix in Spiral Order
- Create Spiral Matrix from given array
- Shift all matrix elements by 1 in Spiral Order
- Find Shortest path from source to destination in a matrix that satisfies given constraints
- Change all elements of row i and column j in a matrix to 0 if cell (i, j) has value 0
- Print diagonal elements of the matrix having positive slope
- Find all paths from first cell to last cell of a matrix
- Replace all occurrences of 0 that are not surrounded by 1 in a binary matrix
- In-place rotate the matrix by 90 degrees in clock-wise direction
- Count negative elements present in sorted matrix in linear time
- Report all occurrences of an element in row wise and column wise sorted matrix in linear time
- Calculate sum of all elements in a sub-matrix in constant time
- Find maximum sum K x K sub-matrix in a given M x N matrix
- Find maximum sum submatrix present in a given matrix
- Count the number of islands
- Flood Fill Algorithm
- Find shortest safe route in a field with sensors present
- Find all occurrences of given string in a character matrix
- Shortest path in a Maze | Lee Algorithm
- Check if given matrix is Toeplitz matrix or not
- In-place rotate the matrix by 180 degrees
- Fill Binary Matrix with Alternating Rectangles of 0 and 1
- Find all common elements present in every row of given matrix
- Construct a Binary Tree from Ancestor Matrix
- Find common elements present in all rows of a matrix
- Find index of the row containing maximum number of 1’s in a binary matrix
- Find the largest square sub-matrix which is surrounded by all 1's
- Find minimum passes required to convert all negative values in the matrix
- Print a spiral square matrix without using any extra space
- Print all shortest routes in a rectangular grid
- Find length of longest path in the matrix with consecutive characters
- Collect maximum value of coins in a matrix
- Young Tableau | Insert, Search, Extract-Min, Delete, Replace
- Sort an array using Young tableau
- Find path from source to destination in a matrix that satisfies given constraints
- Generate list of possible words from a character matrix
- Find probability that a person is alive after taking N steps on the island
- Collect maximum points in a matrix by satisfying given constraints
- Count number of paths in a matrix with given cost to reach destination cell
- Find longest sequence formed by adjacent numbers in the matrix
- Find the minimum cost to reach last cell of the matrix from its first cell
- Ways to reach the bottom-right corner of a matrix with exactly k turns allowed
- Matrix Chain Multiplication
- Find size of largest square sub-matrix of 1’s present in given binary matrix
- Chess Knight Problem — Find Shortest path from source to destination
- Find Duplicate rows in a binary matrix
- Print all possible solutions to N Queens Problem
- Print all Possible Knight’s Tours in a chessboard
- Find Shortest Path in Maze
- Find Longest Possible Route in a Matrix
- Find total number of unique paths in a maze from source to destination
- Calculate size of the largest plus of 1’s in binary matrix
- Find the maximum value of M[c][d] — M[a][b] over all choices of indexes
- Find shortest distance of every cell from landmine in a Maze
- Find shortest route in a device to construct the given string
- Calculate minimum cost to reach destination city from source city
- Count all paths in a matrix from first cell to last cell
- Merge M sorted lists each containing N elements
- Travelling Salesman Problem using Branch and Bound
- Puzzles
- Clock Angle Problem — Find angle between hour and minute hand
- Add two numbers without using addition operator
- Generate power set of a given set
- Implement power function without using multiplication and division operators
- Print all numbers between 1 to N without using semicolon
- Swap two numbers without using third variable
- Determine the if condition to print specific output
- Find maximum & minimum of triplet without using conditional statement and ternary operator
- Find numbers represented as sum of two cubes for two different pairs
- Print “Hello World” with empty main() function
- Tower of Hanoi Problem
- Print all numbers between 1 to N without using any loop
- Print a semicolon without using semicolon anywhere in the program
- Multiply two numbers without using multiplication operator or loops
- Find square of a number without using multiplication and division operator
- Find if a number is even or odd without using any conditional statement
- Set both elements of a binary array to 0 in single line
- Find minimum number without using conditional statement or ternary operator
- Perform Division of two numbers without using division operator (/)
- Generate 0 and 1 with 75% and 25% Probability
- Generate Desired Random Numbers With Equal Probability
- Return 0, 1 and 2 with equal Probability using the specified function
- Generate Fair Results from a Biased Coin
- Generate numbers from 1 to 7 with equal probability using specified function
- Implement Ternary Operator Without Using Conditional Expressions
- Determine if two integers are equal without using comparison and arithmetic operators
- Return 0 and 1 with equal Probability using the specified function
- Generate random input from an array according to given probabilities
- Compute modulus division without division and modulo operator
- Queue
- Queue Implementation using Array/List — C, C++, Java, Python
- Queue Implementation using Linked List
- Implement Stack using Queue Data Structure
- Implement a Queue using Stack Data Structure
- Efficiently print all nodes between two given levels in a binary tree
- Chess Knight Problem — Find Shortest path from source to destination
- Shortest path in a Maze | Lee Algorithm
- Find shortest safe route in a field with sensors present
- Flood Fill Algorithm
- Count the number of islands
- Find Shortest path from source to destination in a matrix that satisfies given constraints
- Generate binary numbers between 1 to N
- Calculate height of a binary tree
- Delete given Binary Tree
- Level Order Traversal of Binary Tree
- Spiral Order Traversal of Binary Tree
- Reverse Level Order Traversal of Binary Tree
- Print all nodes of a given binary tree in specific order
- Print left view of binary tree
- Find next node in same level for given node in a binary tree
- Check if given binary tree is complete binary tree or not
- Print Diagonal Traversal of Binary Tree
- Print corner nodes of every level in binary tree
- Invert a Binary Tree
- Find minimum passes required to convert all negative values in the matrix
- Convert a Binary Tree into a Doubly Linked List in Spiral Order
- Check if a binary tree is a min-heap or not
- Invert alternate levels of a perfect binary tree
- Convert a Binary Search Tree into a Min Heap
- Snake and Ladder Problem
- Find shortest distance of every cell from landmine in a Maze
- Convert a multilevel linked list to a singly linked list
- Breadth First Search (BFS) Algorithm
- Check if an undirected graph contains cycle or not
- Find maximum cost path in graph from given source to destination
- Total paths in given digraph from given source to destination having exactly m edges
- Least cost path in given digraph from given source to destination having exactly m edges
- Sorting
- Insertion Sort Algorithm
- Selection Sort Algorithm
- Bubble Sort Algorithm
- Merge Sort Algorithm
- Iterative Merge Sort Algorithm (Bottom-up Merge Sort)
- QuickSort Algorithm
- Iterative Implementation of QuickSort
- Hybrid QuickSort
- QuickSort using Dutch National Flag Algorithm
- QuickSort using Hoare’s Partitioning scheme
- Heap Sort Algorithm
- Introsort Algorithm
- External Merge Sort Algorithm
- Counting Sort Algorithm
- Inversion Count of an array
- Sort an array using Young tableau
- Merge Sort Algorithm for Singly Linked List
- Problems solved using partitioning logic of QuickSort
- Sort a Doubly Linked List using Merge Sort
- Sort elements by their frequency and Index
- Sort an array based on order defined by another array
- Efficiently sort an array with many duplicated values
- Find largest number possible from set of given numbers
- Find the surpasser count for each element of an array
- Segregate positive and negative integers using Merge Sort
- Group anagrams together from given list of words
- Stack
- Stack Implementation using Array/List — C, C++, Java, Python
- Stack Implementation using Linked List
- Check if given expression is balanced expression or not
- Find duplicate parenthesis in an expression
- Evaluate given postfix expression
- Decode the given sequence to construct minimum number without repeated digits
- Design a stack which returns minimum element in constant time
- Design a stack which returns minimum element without using auxiliary stack
- Merging Overlapping Intervals
- Reverse String without using Recursion
- Implement Stack using Queue Data Structure
- Implement a Queue using Stack Data Structure
- Implement two stacks in a single array
- Recursive solution to sort a stack
- Find length of the longest balanced parenthesis in a string
- Reverse a string using stack data structure
- Find all elements in an array that are greater than all elements present to their right
- Inorder Tree Traversal
- Preorder Tree Traversal
- Postorder Tree Traversal
- Find preorder traversal of a binary tree from its inorder and postorder sequence
- Find ancestors of given node in a Binary Tree
- Check if two given binary trees are identical or not
- Reverse Level Order Traversal of Binary Tree
- Reverse given text without reversing the individual words
- Find all binary strings that can be formed from given wildcard pattern
- Iterative Implementation of QuickSort
- Depth First Search (DFS) Algorithm
- Invert a Binary Tree
- Print leaf to root path for every leaf node in a binary tree
- Longest Increasing Subsequence
- Invert alternate levels of a perfect binary tree
- String
- Check if given string is a rotated palindrome or not
- Longest Palindromic Substring (Non-DP Space Optimized Solution)
- Check if repeated subsequence is present in the string or not
- Check if strings can be derived from each other by circularly rotating them
- Check if given set of moves is circular or not
- Convert given number into corresponding excel column name
- Determine if two strings are anagram or not
- Find all binary strings that can be formed from given wildcard pattern
- Find all interleaving of given strings
- Isomorphic Strings
- Find all possible palindromic substrings in a string
- Find all possible combinations of words formed from mobile keypad
- Find all possible combinations by replacing given digits with characters of the corresponding list
- Find all words from given list that follows same order of characters as given pattern
- Group anagrams together from given list of words
- Find minimum operations required to transform a string into another string
- Determine if a string can be transformed into another string with a single edit
- Find length of the longest balanced parenthesis in a string
- In place remove all occurrences of ‘AB’ and ‘C’ from the string
- Longest even length palindromic sum substring
- Print string in zig-zag form in k rows
- Reverse given text without reversing the individual words
- Run Length Encoding (RLE) Data Compression Algorithm
- Find the longest substring of given string containing k distinct characters
- Find all palindromic permutations of a string
- Find all substrings of a string that are permutation of a given string
- Find the longest substring of given string containing all distinct characters
- Iterative Approach to find Permutations of a String
- Generate all Permutations of a String in Java
- Find all lexicographically next permutations of a string sorted in ascending order
- Find Lexicographically minimal string rotation
- Find all strings of given length containing balanced parentheses
- Find all combinations of non-overlapping substrings of a string
- Determine if a given string is palindrome or not
- Find the minimum number of inversions needed to make the given expression balanced
- Construct the longest palindrome by shuffling or deleting characters from a string
- Print all combinations of phrases formed by picking words from each of the given lists
- Break a string into all possible combinations of non-overlapping substrings
- Remove all extra spaces from a string
- Remove adjacent duplicate characters from a string
- Find first non-repeating character in a string by doing only one traversal of it
- Find all N-digit strictly increasing numbers (Bottom-Up and Top-Down Approach)
- Find all N-digit binary numbers having more 1’s than 0’s for any prefix
- Find all N-digit numbers with given sum of digits
- Find all N-digit binary numbers with k-bits set where k ranges from 1 to N
- Find all N-digit binary numbers with equal sum of bits in its two halves
- Find all N-digit numbers with equal sum of digits at even and odd index
- Find all Lexicographic Permutations of a String
- Lexicographic Rank of a String
- Find all lexicographically previous permutations of a string sorted in descending order
- Replace all non-overlapping occurrences of the pattern
- Introduction to Pattern Matching
- Implementation of KMP Algorithm
- Reverse String without using Recursion
- Reverse given string using Recursion
- Determine if characters of a String follow a specified order or not
- In-place remove all adjacent duplicates from the given string
- Check if given sentence is syntactically correct or not
- Find all Permutations of a given string
- Find first k non-repeating characters in a string in single traversal
- Check if given string is interleaving of two other given strings
- Decode the given sequence to construct minimum number without repeated digits
- Combinations of words formed by replacing given numbers with corresponding alphabets
- Count number of times a pattern appears in given string as a subsequence
- Check if a string matches with a given wildcard pattern
- Find all words matching a pattern in the given dictionary
- The Levenshtein Distance (Edit Distance) Problem
- Longest Common Subsequence Problem
- Longest Repeated Subsequence Problem
- Longest Palindromic Subsequence using Dynamic Programming
- Longest Common Substring Problem
- Shortest Common Supersequence Problem
- Word Break Problem
- Wildcard Pattern Matching
- Find minimum cuts needed for palindromic partition of a string
- Check if a string is K-Palindrome or not
- Find shortest route in a device to construct the given string
- Find minimum number possible by doing at-most K swaps
- Determine if a pattern matches with a string or not
- Find minimum number of deletions required to convert a string into palindrome
- Trie
- Trie Implementation — C, C++, Java, Python
- Memory Efficient Implementation of Trie | Insert, Search and Delete
- Longest Common Prefix in given set of strings (using Trie)
- Lexicographic sorting of given set of keys
- Find maximum occurring word in given set of strings
- Find first k maximum occurring words in given set of strings
- Find Duplicate rows in a binary matrix
- Word Break Problem | Using Trie
- Generate list of possible words from a character matrix
- Find all words matching a pattern in the given dictionary
- How is a bubble sort algorithm implemented? (solution)
- How is a merge sort algorithm implemented? (solution)
- How do you count the occurrence of a given character in a string? (solution)
- How do you print the first non-repeated character from a string? (solution)
- How do you convert a given String into int like the atoi()? (solution)
- How do you implement a bucket sort algorithm? (solution)
- How do you implement a counting sort algorithm? (solution)
- How do you remove duplicates from an array in place? (solution)
- How do you reverse an array in place in Java? (solution)
- How are duplicates removed from an array without using any library? (solution)
- How is a radix sort algorithm implemented? (solution)
- How do you swap two numbers without using the third variable? (solution)
- How do you check if two rectangles overlap with each other? (solution)
- How do you design a vending machine? (solution)
- How do you find the missing number in a given integer array of 1 to 101? (solution)
- How do you find the duplicate number on a given integer array? (solution)
- How do you find duplicate numbers in an array if it contains multiple duplicates? (solution)
- Difference between a stable and unstable sorting algorithm? (answer)
- How is an iterative quicksort algorithm implemented? (solution)
- How do you find the largest and smallest number in an unsorted integer array? (solution)
- How do you reverse a linked list in place? (solution)
- How to add an element at the middle of the linked list? (solution)
- How do you sort a linked list in Java? (solution)
- How do you find all pairs of an integer array whose sum is equal to a given number? (solution)
- How do you implement an insertion sort algorithm? (solution)
- How are duplicates removed from a given array in Java? (solution)
- how to remove the duplicate character from String? (solution)
- How to find the maximum occurring character in given String? (solution)
- How is an integer array sorted in place using the quicksort algorithm? (solution)
- How do you reverse a given string in place? (solution)
- How do you print duplicate characters from a string? (solution)
- How do you check if two strings are anagrams of each other? (solution)
- How do you find all the permutations of a string? (solution)
- How can a given string be reversed using recursion? (solution)
- How do you check if a given string is a palindrome? (solution)
- How do you find the length of the longest substring without repeating characters? (solution)
- Given string str, - How do you find the longest palindromic substring in str? (solution)
- How do you check if a string contains only digits? (solution)
- How to remove Nth Node from the end of a linked list? (solution)
- How to merge two sorted linked list? (solution)
- How to convert a sorted list to a binary search tree? (solution)
- How do you find duplicate characters in a given string? (solution)
- How do you count a number of vowels and consonants in a given string? (solution)
- How do you reverse words in a given sentence without using any library method? (solution)
- How do you check if two strings are a rotation of each other? (solution)
- How to convert a byte array to String? (solution)
- How do you remove a given character from String? (solution)
- How do you find the middle element of a singly linked list in one pass? (solution)
- How do you check if a given linked list contains a cycle? - How do you find the starting node of the cycle? (solution)
- How do you reverse a linked list? (solution)
- How do you reverse a singly linked list without recursion? (solution)
- How are duplicate nodes removed in an unsorted linked list? (solution)
- How do you find the length of a singly linked list? (solution)
- How do you find the third node from the end in a singly linked list? (solution)
- How do you find the sum of two linked lists using Stack? (solution)
- What is the difference between array and linked list? (answer)
- How to remove duplicates from a sorted linked list? (solution)
- How to find the node at which the intersection of two singly linked lists begins. (solution)
- Given a linked list and a value x, partition it such that all nodes less than x come before nodes greater than or equal to x. (solution)
- How to check if a given linked list is a palindrome? (solution)
- How to remove all elements from a linked list of integers which matches with given value? (solution)
- How is a binary search tree implemented? (solution)
- How do you perform preorder traversal in a given binary tree? (solution)
- How do you traverse a given binary tree in preorder without recursion? (solution)
- How do you perform an inorder traversal in a given binary tree? (solution)
- How do you print all nodes of a given binary tree using inorder traversal without recursion? (solution)
- How do you implement a postorder traversal algorithm? (solution)
- How do you traverse a binary tree in postorder traversal without recursion? (solution)
- How are all leaves of a binary search tree printed? (solution)
- How do you count a number of leaf nodes in a given binary tree? (solution)
- How do you perform a binary search in a given array? (solution)
- How to Swap two numbers without using the third variable? (solution)
- How to check if two rectangles overlap with each other? (solution)
- How to design a Vending Machine? (solution)
- How to implement an LRU Cache in your favorite programming language? (solution)
- How to check if a given number is a Palindrome? (solution)
- How to check if a given number is an Armstrong number? (solution)
- How to find all prime factors of a given number? (solution)
- How to find the largest prime factor of a given integral number? (solution)
- How to print all prime numbers up to a given number? (solution)
- How to calculate the square root of a given number? (solution)
- How to check if the given number is a prime number? (solution)
- How to add two numbers without using the plus operator in Java? (solution)
- How to check if a given number is even/odd without using Arithmetic operator? (solution)
- How to print a given Pyramid structure? (solution)
- How to find the highest repeating world from a given file in Java? (solution)
- How to convert a decimal number to binary in Java? (solution)
- How to check if a given year is a leap year in Java? (solution)
- Can you implement a Binary search Algorithm without recursion? (solution)
- Difference between a stable and unstable sorting algorithm? (answer)
- What is Depth First Search Algorithm for a binary tree? (solution)
- How is an iterative quicksort algorithm implemented? (solution)
- How do you implement an insertion sort algorithm? (solution)
- How is a merge sort algorithm implemented? (solution)
- What is the difference between Comparison and Non-Comparison Sorting Algorithms? (answer)
- How do implement Sieve of Eratosthenes Algorithms for Prime Number? (solution)
- How to find sub array with maximum sum? (solution)
- Find pair with given sum in the array
- Check if subarray with 0 sum is exists or not
- Print all sub-arrays with 0 sum
- Sort binary array in linear time
- Find a duplicate element in a limited range array
- Find maximum length sub-array having given sum
- Find maximum length sub-array having equal number of 0’s and 1’s
- Find maximum product of two integers in an array
- Sort an array containing 0’s, 1’s and 2’s (Dutch National Flag Problem)
- In place merge two sorted arrays
- Merge two arrays by satisfying given constraints
- Find index of 0 to replace to get maximum length sequence of continuous ones
- Shuffle a given array of elements (Fisher–Yates shuffle)
- Rearrange the array with alternate high and low elements
- Find equilibrium index of an array
- Find largest sub-array formed by consecutive integers
- Find majority element (Boyer–Moore Majority Vote Algorithm)
- Move all zeros present in the array to the end
- Replace each element of array with product of every other element without using / operator
- Find Longest Bitonic Subarray in an array
- Longest Increasing Subsequence
- Find maximum difference between two elements in the array by satisfying given constraints
- Maximum Sum Subarray Problem (Kadane’s Algorithm)
- Print continuous subarray with maximum sum
- Maximum Sum Circular Subarray
- Find all distinct combinations of given length — I
- Find all distinct combinations of given length with repetition allowed
- Find maximum sequence of continuous 1’s formed by replacing at-most k zeroes by ones
- Find minimum sum subarray of given size k
- Find maximum product subarray in a given array
- Find subarray having given sum in given array of integers
- Find the length of smallest subarray whose sum of elements is greater than the given number
- Find largest number possible from set of given numbers
- Find the smallest window in array sorting which will make the entire array sorted
- Find maximum sum path involving elements of given arrays
- Maximum profit earned by buying and selling shares any number of times
- Trapping Rain Water within given set of bars
- Find minimum platforms needed in the station so to avoid any delay in arrival of any train
- Decode the array constructed from another array
- Sort an array using one swap
- Find Triplet with given sum in an array
- Length of longest continuous sequence with same sum in given binary arrays
- Reverse every consecutive m elements of the given subarray
- Maximum Product Subset Problem
- Find pairs with given difference k in the array
- Find pairs with given difference k in the array | Constant space solution
- 4 sum problem | Quadruplets with given sum
- Print all quadruplets with given sum | 4-sum problem extended
- Quickselect Algorithm
- Rearrange array such that A[A[i]] is set to i for every element A[i]
- Print all Triplets that forms Arithmetic Progression
- Print all Triplets that forms Geometric Progression
- Print all combination of numbers from 1 to n having sum n
- Replace each element of the array by its corresponding rank in the array
- Print all Triplets in an array with sum less than or equal to given number
- Group elements of an array based on their first occurrence
- Find minimum difference between index of two given elements present in the array
- Find maximum absolute difference between sum of two non-overlapping sub-arrays
- Find all Symmetric Pairs in an Array of Pairs
- Partition an array into two sub-arrays with the same sum
- Find count of distinct elements in every sub-array of size k
- Find two numbers with maximum sum formed by array digits
- Print all sub-arrays of an array having distinct elements
- Find a Triplet having Maximum Product in an Array
- Find Minimum Index of Repeating Element in an Array
- Generate random input from an array according to given probabilities
- Find pair in an array having minimum absolute sum
- Find Index of Maximum Occurring Element with Equal Probability
- Check if an Array is Formed by Consecutive Integers
- Find two non-overlapping pairs having same sum in an array
- Add elements of two arrays into a new array
- Find Minimum Product among all Combinations of Triplets in an Array
- Replace every element of an array with the least greater element on its right
- Find all odd occurring elements in an array having limited range of elements
- Count the distinct absolute values in the sorted array
- Print all combinations of positive integers in increasing order that sum to a given number
- Find all distinct combinations of given length — II
- Find subarrays with given sum in an array
- Find the surpasser count for each element of an array
- Find maximum length sequence of continuous ones (Using Sliding Window)
- Find maximum length sequence of continuous ones
- Find index that divides an array into two non-empty subarrays of equal sum
- Calculate frequency of all elements present in an array of specified range
- Rearrange the array such that it contains positive and negative numbers at alternate positions
- Find a sorted triplet in the given array
- Shuffle an array according to the given order of elements
- Count number of strictly increasing sub-arrays in an array
- Find duplicates within given range k in an array
- Longest Alternating Subarray Problem
- Find minimum range with at-least one element from each of the given arrays
- Find longest subsequence formed by consecutive integers
- Find all elements in an array that are greater than all elements present to their right
- Find missing number in array without using extra space
- Determine index of an element in given array which satisfies given constraints
- Find minimum moves required for converting a given array to an array of zeroes
- Left rotate an array
- Right rotate an array k times
- Find maximum profit earned from at most two stock transactions
- Find Frequency of each element in a sorted array containing duplicates
- Find Minimum and Maximum element in an array using minimum comparisons
- Difference between Subarray, Subsequence and Subset
- Find odd occurring element in an array in single traversal
- Find odd occurring element in logarithmic time
- Find two odd occurring elements in an array without using any extra space
- Check if given array represents min heap or not
- Find K’th smallest element in an array
- Find K’th largest element in an array
- Sort a K-Sorted Array
- Merge M sorted lists of variable length
- Find smallest range with at-least one element from each of the given lists
- Merge M sorted lists each containing N elements
- Find maximum sum of subsequence with no adjacent elements
- Find ways to calculate a target from elements of specified array
- Sort elements by their frequency and Index
- Sort an array based on order defined by another array
- Inversion Count of an array
- Segregate positive and negative integers in linear time
- Find number of rotations in a circularly sorted array
- Search an element in a circular sorted array
- Find first or last occurrence of a given number in a sorted array
- Count occurrences of a number in a sorted array with duplicates
- Find smallest missing element from a sorted array
- Find Floor and Ceil of a number in a sorted array
- Search in a nearly sorted array in logarithmic time
- Find number of 1’s in a sorted binary array
- Find Missing Term in a Sequence in Logarithmic time
- Find missing number and duplicate elements in an array
- Find the peak element in an array
- Find Floor and Ceil of a number in a sorted array (Recursive solution)
- Print all distinct subsets of a given set
- Find two duplicate elements in a limited range array (using XOR)
- Combinations of words formed by replacing given numbers with corresponding alphabets
- 0–1 Knapsack Problem
- Subset sum Problem
- Partition Problem
- 3-Partition Problem
- 3-partition problem extended | Print all partitions
- K-Partition Problem | Printing all Partitions
- Minimum Sum Partition Problem
- Rod Cutting
- Longest Alternating Subsequence Problem
- Coin change-making problem (unlimited supply of coins)
- Coin Change Problem — Find total number of ways to get the denomination of coins
- Find maximum profit earned from at most K stock transactions

## Comments