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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
Search in a 2D Matrix
Arrays (Sum of array)
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