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SCHOOL (2)
BASIC (35)
EASY (179)
MEDIUM (261)
HARD (35)
- Reverse a linked list
- Pairwise swap elements of a linked list
- Node at a given index in linked list
- Delete nodes having greater value on right
- Remove duplicates from an unsorted linked list
- Inorder Traversal
- Bubble Sort
- Insertion Sort
- Right View of Binary Tree
- Height of Binary Tree
- Balanced Tree Check
- Kth from End of Linked List
- Middle of a Linked List
- Check If Circular Linked List
- Left View of Binary Tree
- Find Transition Point
- Queue using two Stacks
- Remove Duplicates from a Sorted Linked List
- Level Order in spiral form
- DFS of Graph
- Stack using Linked List
- Insert a node in a BST
- BFS of graph
- Identical Trees
- Square Root
- Binary Search
- Remove Duplicates Sorted Array
- Binary Tree to BST
- Josephus problem
- Delete in a Singly Linked List
- Kth largest element in BST
- Minimum distance in an Array
- Array Duplicates
- Special Stack
- Three way partitioning
- Inorder Successor in BST
- Index of an Extra Element
- Insert in a Sorted List
- Minimum element in BST
- More than n/k Occurrences
- Reverse Using Stack
- Next Right Node
- Count Pairs whose sum is equal to X
- Leaf under budget
- Queue Reversal
- Reverse first K of a Queue
- Find Sum Pairs Across Two BSTs
- Product of an Array
- Taking input
- Learn to Comment
- Learning to be precise
- Swap the array elements
- Predict the Column
- Count Odd Even - Java
- Delete Array
- Maximum Area Rectangle
- Sum of Big Integers
- Find the Frequency
- Back to Front
- Java ArrayList Operation
- Get min at pop
- Check K-th Bit
- Power of 2
- Frequencies in a Limited Array
- Equilibrium Point
- Array Leaders
- Floor in a Sorted Array
- Minimum Number in a sorted rotated array
- Print adjacency list
- Sum of upper and lower triangles
- Print Matrix in snake Pattern
- Matrix Boundary Traversal
- Anagram
- Winner of an election
- Reverse Words
- Non Repeating Character
- Parenthesis Checker
- Count number of hops
- First Repeating Element
- Union of Arrays with Duplicates
- Check Equal Arrays
- Missing in Array
- Product array puzzle
- Roman Number to Integer
- Max Value Permutation
- Missing And Repeating
- Pairs of equals Sum
- Find Kth Rotation
- Adding Ones
- Common in 3 Sorted Arrays
- Sum of elements between k1'th and k2'th smallest elements
- Move All Zeroes to End
- Min sum formed by digits
- Move all negative elements to end
- Chocolate Distribution Problem
- Count the triplets
- Find Pair Given Difference
- Bitonic Point
- Sort Array II
- Alternate Positive Negative
- Addition of submatrix
- Second Largest
- Two Sum - Pair with Given Sum
- Rotate Bits
- Number of occurrence
- Reversing the equation
- Convert an array to reduced form
- Check if array is sorted
- Longest Common Prefix of Strings
- Two sum -Pairs with 0 Sum
- Segregate 0s and 1s
- Count the Zeros
- Palindrome String
- Delete Array Elements
- Fitting The Array
- Balanced string
- Minimum Operations
- Adding Array Elements
- AND operation
- Max Sum Subarray of size K
- Nth Fibonacci Number
- Change Bits
- Shortest path from 1 to n
- Sum 1 to n Divisors
- The Bit Game
- Break a number
- Perfect Numbers
- Smallest number with sum of digits as N and divisible by 10^N
- Form a number divisible by 3 using array digits
- Least Prime Factor
- Tom and Jerry
- Arithmetic Number
- Surround the 1's
- Help Ishaan
- Letters Collection
- Print Pattern
- Print the pattern
- Maximum Sum LCM
- Check if it is possible to convert one string into another with given constraints
- Minimum Exchange
- Earthquake and the Paint Shop
- Count all possible paths from top left to bottom right
- Ball coloring
- Modified Numbers and Queries
- Sum of k smallest elements in BST
- Print Diagonally
- Maximum number of 2X2 squares
- First and last occurrences of x
- License Key Formatting
- Count the Substrings
- Find all possible paths from top to bottom
- Smallest Subset with Greater Sum
- Minimum Sum of Absolute Differences of Pairs
- Smallest window containing 0, 1 and 2
- Move Last Element to Front of a Linked List
- Find pairs with given sum in doubly linked list
- Triangle and Square
- Bus Ticket Change
- Type it!
- Balloon Everywhere
- Frogs and Jumps
- Make Array Elements Equal
- Equal Left and Right Subarray Sum
- Is it Fibonacci
- Taxi Booking
- Max Level Sum in Binary Tree
- Binary matrix having maximum number of 1s
- Number of Subarrays of 0's
- Wifi Range
- Minimum Number
- Minimum Integer
- Seating Arrangement
- String Mirror
- Make Palindrome
- Total Cuts
- Bit Magic
- Dominant Pairs
- Total Traversal Time
- Ticket Counter
- Reverse alternate nodes in Link List
- Sort a linked list of 0s, 1s and 2s
- Add 1 to a Linked List Number
- Merge 2 sorted linked list in reverse order
- Detect Loop in linked list
- QuickSort on Doubly Linked List
- Count BST nodes that lie in a given range
- Check for BST
- Quick Sort
- Delete without head pointer
- Heap Sort
- Diagonal Tree Traversal
- Stack using Queue
- Implement stack using array
- Absolute List Sorting
- Lowest Common Ancestor in a BST
- Two Stacks in an Array
- Largest subarray with 0 sum
- Topological Sort
- Find kth element of spiral matrix
- Max sum in the configuration
- Generate IP Addresses
- Largest BST
- Count Palindromic Subsequences
- Multiply two strings
- Bipartite Graph
- Closest in BST
- Pots of Gold Game
- Longest Palindrome in Linked List
- Find triplets with zero sum
- Sort a stack
- Duplicate Subtree
- k-th Smallest in BST
- Find Common Nodes in two BSTs
- Peak element
- Polynomial Addition
- Delete nodes greater than k
- Euler circuit and Path
- Binary Tree to CDLL
- Complete Binary Tree
- Counting elements in two arrays
- K Sum Paths
- Foldable Binary Tree
- Leftmost and rightmost nodes of binary tree
- Isomorphic Trees
- Predecessor and Successor
- Find length of Loop
- Median of BST
- Normal BST to Balanced BST
- Kth Ancestor in a Tree
- Mother Vertex
- Ceil in BST
- Reverse array in groups
- Smallest Positive Missing
- Wave Array
- Rearrange an array with O(1) extra space
- Rotate Array
- Kadane's Algorithm
- Majority Element
- Two Repeated Elements
- Union of 2 Sorted Arrays
- Indexes of Subarray Sum
- Merge Without Extra Space
- Level of Nodes
- Make Matrix Beautiful
- Boolean Matrix
- Distance of nearest cell having 1
- Unit Area of largest region of 1's
- Subarray with 0 sum
- Case-specific Sorting of Strings
- Postfix Evaluation
- Next Greater Element
- K Sized Subarray Maximum
- Minimum Cost of ropes
- Fractional Knapsack
- Black and White
- M-Coloring Problem
- Minimum Jumps
- Detect Cycle using DSU
- Stickler Thief
- Egg Dropping Puzzle
- Longest Increasing Subsequence
- Longest Common Subsequence
- Lucky Numbers
- Preorder to BST
- X Total Shapes
- Zero Sum Subarrays
- Kth Smallest
- Nth Catalan Number
- Count subsequences of type a^i, b^j, c^k
- Top K Frequent in Array
- 4 Sum - All Quadruples
- Sort 0s, 1s and 2s
- Complement
- Maximum Sub Array
- Pascal Triangle
- Maximum Index
- Flip Bits
- Top k numbers in a stream
- Equivalent Sub-Arrays
- Pythagorean Triplet
- Search in Rotated Sorted Array
- Count Full Binary Trees
- Longest subarray with sum divisible by K
- Check if a string is repetition of its substring of k-length
- Column name from a given column number
- Sort in specific order
- Form a palindrome
- Nuts and Bolts Problem
- Longest Subarray with Sum K
- Next Smaller Element
- Number of positive integral solutions
- The Fibonacci-prime number
- k largest elements
- Sum of XOR of all pairs
- Smallest distinct window
- Longest Substring with K Uniques
- Rod Cutting
- Maximize the sum of selected numbers from a sorted array to make it empty
- Longest Palindromic Subsequence
- Largest Sum Subarray of Size at least K
- Minimum sum
- Build the smallest
- Minimize the Heights II
- First and Last Occurrences
- Reaching the heights
- Minimum Deletions
- A difference of values and indexes
- Nine Divisors
- Friends Pairing Problem
- CamelCase Pattern Matching
- Lexicographically smallest string
- Subarrays Product Less than K
- Unique Number II
- Bleak Numbers
- Largest prime factor
- 3 Divisors
- Max Sum Increasing Subsequence
- Coin Change (Count Ways)
- Sequence of Sequence
- Santa Banta
- Perfect Sum Problem
- Power Of 2 and Subsequences
- Knapsack with Duplicate Items
- nCr
- Number of ways
- Partition Equal Subset Sum
- Count possible ways to construct buildings
- Count digit groupings of a number
- Array Pair Sum Divisibility Problem
- Brain Game
- Fill the Tank
- Akku and Binary Numbers
- Number of paths
- Nth Natural Number
- Knight Walk
- Stepping Numbers
- Fact Digit Sum
- A Game of LCM
- Smaller on Left
- Filling Bucket
- Matrix Exponentiation
- Longest Repeating Subsequence
- Composite and Prime
- Finding Profession
- Decode the string
- Total Decoding Messages
- Longest Perfect Piece
- The Smurfs
- Transitive closure of a Graph
- Replace O's with X's
- Find all distinct subset (or subsequence) sums
- Queries on a Matrix
- Find the string in grid
- Shortest Uncommon Subsequence
- Count the paths
- Techfest and the Queue
- Shortest Source to Destination Path
- Reverse Spiral Form of Matrix
- Geek and Number String
- Save Your Life
- Bellman-Ford
- Remove K Digits
- Substrings of length k with k-1 distinct elements
- Number of Provinces
- Binary Matrix with at most K 1s
- Maximum sum leaf to root path
- Find duplicate rows in a binary matrix
- BST to max heap
- BST to greater sum tree
- Paths from root with a specified sum
- Shortest Prime Path
- Sort for Singly Linked List
- Flatten binary tree to linked list
- Anti Diagonal Traversal of Matrix
- IPL 2021 - Match Day 2
- All Unique Permutations of an array
- Course Schedule II
- Remove and Reverse
- Longest Possible Route in a Matrix with Hurdles
- Even Swap
- Reverse a Stack
- Levels Of Game
- Smallest sum contiguous subarray
- Validate Stack Operations
- Replace every element with the least greater element on its right
- Minimum Swaps
- Number of Distinct Islands
- Shortest Distance in a Binary Maze
- Minimum Multiplications to reach End
- Number Of Enclaves
- Safe States
- Alex Travelling
- Number Of Islands
- Merging Details
- Shortest path in Directed Acyclic Graph
- Aggressive Cows
- Task Scheduler
- Maximum Sum Combination
- Find the first node of loop in linked list
- Carpet into Box
- Maximum Bipartite Matching
- Minimum Days
- Prime List
- Walls Coloring
- Water the plants
- Geeks Island
- Apple Sequences
- Fill the Matrix
- Best Node
- Maximum Intersecting Lines
- String rp or pr
- Shy Geek
- Count Special Numbers
- Minimum Steps Required
- Count Cyclic Paths
- Maximum Triplet product
- Maximum Possible Value
- Distinct Difference
- Anagrams in Linked List
- Maximum Length
- Remove the balls
- Unequal Arrays
- Job Sequencing Problem
- Bheem Wants Ladoos
- Prefix Suffix String
- Smaller Sum
- Shortest XY distance in Grid
- BST Maximum Difference
- Nearest smaller tower
- Another Coin Change Problem
- Geek's Village and Wells
- Find Number
- Powerful Integer
- Subtree In N-ary Tree
- Add Minimum Characters
- Palindrome with minimum sum
- Find Kth permutation
- Fraction pairs with sum 1
- New Year Resolution
- Grinding Geek
- Linked List Group Reverse
- Reorder List
- Binary Tree to DLL
- Partition array to k subsets
- AVL Tree Deletion
- Nodes at given distance in binary tree
- Number of Turns in Binary Tree
- String Permutations
- Solve the Sudoku
- Next Smallest Palindrome
- Search Pattern
- Count Smaller elements
- Number of distinct subsequences
- Wildcard string matching
- Palindromic Partitioning
- Word Break - 2
- Brackets in Matrix Chain Multiplication
- Assignment Problem
- Minimum X (xor) A
- Count occurrences of a given word in a 2-d array
- Reverse a sublist of a linked list
- Distribute Candies
- Split Array Largest Sum
- Articulation Point - I
- Min Chars to Add for Palindrome
- Vertex Cover
- Fixing Two swapped nodes of a BST
- Redundant Parenthesis
- Partition the Array
- Divide in Incremental Groups
- Max min Height
- Minimum BST Sum Subtree
- Game Of Subsets
- Geekina Hate 1s
- Making A Large Island
- Print Linked List
- Find Length of Linked List
- Count Leaves in Binary Tree
- Queue Using Array
- Preorder Traversal
- Sum Except First and Last
- Linked List Insertion At End
- Is Linked List Length Even?
- Insert in Middle of Linked List
- Start Coding
- Count Odd and Even
- Array Search
- Sorted Array Search
- Reverse a String
- First n Fibonacci
- C++ Hello World
- Minimum Product of k Integers
- Searching in an Array
- Doubling the value
- Count pair sum
- Sort a String
- Alternative Sorting
- Maximum product of two numbers
- Value equal to index value
- Repeated Character
- Elements in the Range
- Last index of One
- Largest Element in Array
- Rotate Array by One
- Game with nos
- One odd Occuring
- Ishaan Loves Chocolates
- Array Subset
- Min and Max in Array
- Max Min