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SCHOOL (2)
BASIC (88)
EASY (167)
MEDIUM (130)
HARD (18)
Rearrange characters
Nearly Sorted Algorithm
Rotate a Linked List
Sort a linked list of 0s, 1s and 2s
Add Number Linked Lists
Detect Loop in linked list
Quick Sort on Linked List
QuickSort on Doubly Linked List
Merge Sort
Quick Sort
Bottom View of Binary Tree
Delete without head pointer
Intersection in Y Shaped Lists
Heap Sort
Merge two sorted linked lists
Add all greater values to every node in a BST
Connect Nodes of Levels
Diagonal Tree Traversal
LCA in Binary Tree
The Celebrity Problem
Largest subarray with 0 sum
Vertical Tree Traversal
Get Min from Stack
Serialize and deserialize a binary tree
Gas Station
Linked List to Binary Tree
Generate IP Addresses
Kth smallest element in a Matrix
Is Binary Tree Heap
Clone a Binary Tree
Remove loop in Linked List
Implement Atoi
Maximum Difference
Palindrome Linked List
Closest in BST
Delete keys in a Linked list
Level order traversal
Merge Sort for Linked List
Ancestors in Binary Tree
Root to Leaf Paths
Counting elements in two arrays
Construct expression tree
Foldable Binary Tree
Children Sum in a Binary Tree
Diagonal sum in binary tree
Construct Tree from Preorder Traversal
Sum of nodes on the longest path
Convert Level Order Traversal to BST
ZigZag Tree Traversal
Count Number of SubTrees having given Sum
Employees Sorter - Java
Pattern Printer - Java
Count set bits
Reverse array in groups
Smallest Positive Missing
Possible Words From Phone Digits
Rotate and delete
Rearrange Array Alternately
Stock buy and sell
Kadane's Algorithm
Majority Element
Count Inversions
Indexes of Subarray Sum
Merge Without Extra Space
Spirally traversing a matrix
Longest Consecutive Subsequence
Case-specific Sorting of Strings
Next Greater Element
K Sized Subarray Maximum
Kth smallest element
Minimum Platforms
Minimum Jumps
Egg Dropping Puzzle
Longest Increasing Subsequence
Longest Common Subsequence
0 - 1 Knapsack Problem
Number of Unique Paths
Equal Sum Partition
Sort according to an Array
Allocate Minimum Pages
Kth Smallest
Nth Catalan Number
Rotten Oranges
Count subsequences of type a^i, b^j, c^k
Maximize The Cut Segments
Container With Most Water
Sort 0s, 1s and 2s
Paths to reach origin
Single Among Doubles in a Sorted
Count of Subarrays
Pythagorean Triplet
Sum of bit differences
Form the Largest Number
Super Primes
Sort in specific order
Form a palindrome
Nuts and Bolts Problem
Rotate a Matrix
k largest elements
Magnet Array Problem
Longest Common Substring
Longest Palindrome in a String
Number of pairs
Longest Palindromic Subsequence
Not a subset sum
Permutations of a String
Friends Pairing Problem
Modular Exponentiation
Max Sum Increasing Subsequence
Coin Change (Count Ways)
Sieve of Eratosthenes
Gold Mine Problem
Smallest number
K-Palindrome
Count ways to N'th Stair(Order does not matter)
Number of ways
Maximum path sum in matrix
Special Keyboard
Partition Equal Subset Sum
Digit multiplier
Matchsticks game
Number of paths
Return two prime numbers
Sum of Query II
Find Prime numbers in a range
How Many X's?
Longest Repeating Subsequence
Is Sudoku Valid
Stream First Non-repeating
Largest square formed in a matrix
Sahil love good scorer
M and N
Reverse a linked list
Frequency in a Linked List
Pairwise swap elements of a linked list
Node at a given index in linked list
Remove duplicates from an unsorted linked list
Inorder Traversal
Reverse a Doubly Linked List
Bubble Sort
Selection Sort
Insertion Sort
Check for BST
K distance from root
Mirror Tree
Maximum Width of Tree
Height of Binary Tree
Balanced Tree Check
Kth from End of Linked List
Middle of a Linked List
Left View of Binary Tree
Transform to Sum Tree
Find Transition Point
Queue using two Stacks
Stack using two queues
Level Order in spiral form
Reverse Level Order Traversal
DFS of Graph
Stack using Linked List
BFS of graph
Identical Trees
Root to leaf path sum
Square Root
Nodes without a Sibling
Lowest Common Ancestor in a BST
Binary Search
Remove Duplicates Sorted Array
Level Order Line by Line
Odd even level difference
Third largest element
Java Collection | Set 1 (ArrayList) Part-2
Expression Tree
Max Level Sum in Binary Tree
Special Stack
Index of an Extra Element
Convert Ternary Expression to Binary Tree
Level of a Node in Binary Tree
Sum of leaf nodes in BST
More than n/k Occurrences
Counting Sort
XOR of a given range
Full Binary Tree
Symmetric Tree
Find the Sum of Last N nodes of the Linked List
Find n/k th node in Linked list
Reverse first K of a Queue
Remove Half Nodes
Sum of Leaf Nodes
Sum of Right Leaf Nodes
Sum of Left Leaf Nodes
Nodes at Odd Levels
Closest Neighbour in BST
Rotate doubly Linked List
Product of an Array
Coding with Operators - Java
Controlled_Printing - Java
Bridge of Stones - Java
Start Coding - Java
The New Line - Java
Data Types - Java
Taking input - Java
Learn to Comment - Java
nextLine and next
Precise Format - Java
logical Operators - Java
Bitwise Operators - Java
Even Odd - Java
For Loop- primeCheck - Java
While loop- printTable - Java
Step by Step Condition - Java
The Loner - Java
Exists or Not? - Java
Matrix Interchange
Count Odd Even - Java
The Pattern Matcher - Java
Need Some Change - Java
Almost Equal -Java
Count the Specials - Java
Even Subsets - Java
Matrix Interchange - Java
Consonants and Vowels check - Java
Predict the Column - Java
Xoring and Clearing - Java
Pair in Java
Maximum Integer Value - Java
Maximum Area Rectangle
Sum of Big Integers
BigInteger Multiply
BigInteger mod
Java ArrayList Operation
Reverse an Array
Stack Operations
Frequency in Queue
Operations on PriorityQueue
Greater and Smaller Ones
Duplicate Elements
Pair Sum Existence
Decimal to binary
First Set Bit
Rightmost different bit
Check K-th Bit
Power of 2
Equilibrium Point
Array Leaders
Print adjacency list
Anagram
String Rotated by 2 Places
Reverse Words
Parenthesis Checker
Generate Binary Numbers
Count ways to N'th Stair
Count number of hops
Reach a given score
Missing in Array
Roman Number to Integer
Find the closest number
Move All Zeroes to End
Minimize the sum of product
Chocolate Distribution Problem
Count the triplets
Bitonic Point
Largest Even Number
Remove Duplicates
Greater on right side
Twice Counter
Second Largest
Convert array into Zig-Zag fashion
Two Sum - Pair with Given Sum
Does array represent Heap
Prime String
Print an array in Pendulum Arrangement
Element with left side smaller and right side greater
Count the Zeros
Java Arrays | Set 1
Palindrome String
Left out candies
Smallest greater elements in whole array
Pair with given sum in a sorted array
Minimum Operations
Swap bits in byte
Number of 1 Bits
Reverse Bits
Nth Fibonacci Number
Swap two nibbles in a byte
Element that appears once where every element occurs twice
Maximum Sum Problem
Shortest path from 1 to n
Euler Totient Function
Number Game
Magic numbers
Maximize Toys
Squares in N*N Chessboard
Total number of Strings
Sum of First N Natural Numbers
Print Pattern
Sum of dependencies in a graph
Print Diagonally
Linked List Group Reverse
Binary Tree to DLL
LRU Cache
Merge Sort on Doubly Linked List
Max Path Sum 2 Special Nodes
Huffman Decoding
Trapping Rain Water
Find median in a stream
Merge Without Extra Space
The Painter's Partition Problem-II
Ugly Numbers
Edit Distance
Minimum sum partition
Bit Difference
Longest valid Parentheses
N-Queen Problem
Create your own Calculator
Smallest Positive Integer that can not be represented as Sum
Rotate Array
Print Linked List
Find Length of Linked List
Check for Binary String
Size of Binary Tree
Count Leaves in Binary Tree
Postorder Traversal
Queue using Linked List
Add two fractions
Replace all 0's with 5
Replace all 0's with 5
Count zeros in a sorted matrix
Print number pattern
Preorder Traversal
Sum Except First and Last
Search a node in BST
Palindromic Array
Minimum element in BST
Circular Linked List Traversal
Is Linked List Length Even?
Modular Node
Sum of Binary Tree
Insert in Middle of Linked List
longest substring containing '1'
Count Non-Leaf Nodes in Tree
Alternates in an Array
Area of Cuboid - Java
min Elements - Java
Sum the common elements
Parties and seats
Bit Difference
Array Search
Keypad typing
C++ Hello World
Searching in an Array
Doubling the value
Sort Array II
Value equal to index value
Check for subsequence
Immediate Smaller Element
Remove Spaces
Find the Number which contain the digit d
Last index of One
Game with nos
Rotating an Array
Count of smaller elements
Remove character
Betting game
Convert String to LowerCase
Anagram Strings
Delete alternate characters
Reverse a String
Java Strings | Set 1
C++ Basic Data types
Java Substring
Java Date and Day
GCD of Array
C++ Input / Output
Check set bits
Set kth bit
Vowel or Not
Decision Making in Java
Java Hello World
Java Input/Output
Java loops | Set 1
LCM And GCD
House Robber
Message Spreading
Factorial
Reverse digits
Power of Pow | Even Number
Power of Pow | Odd Numbers
Binary number to decimal number
Java Operators(Relational) | Set - 2
Java 1-d and 2-d Array
The dice problem
Java Basic Data Types
Gray to Binary and Binary to Gray
Print the Kth Digit
Height of Heap
Doctors Clinic
Half N by M
Pairs of prime number
Minimum difference pair
Finding Position
Java Operators(Arithmetic) | Set 1
Java Switch Case statement
Java Collection | Set 1 (ArrayList) Part-1
Reverse an Array
Search in a 2D Matrix
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