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SCHOOL (1)
BASIC (47)
EASY (112)
MEDIUM (130)
HARD (20)
Triangle and Square
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
Inorder Traversal
Check for BST
Right View of Binary Tree
K distance from root
Mirror Tree
Two Mirror Trees
Maximum Width of Tree
Delete without head pointer
Height of Binary Tree
Balanced Tree Check
Middle of a Linked List
Left View of Binary Tree
Delete Middle of Linked List
Transform to Sum Tree
Find Transition Point
Queue using two Stacks
Remove Duplicates from a Sorted Linked List
Stack using two queues
Level Order in spiral form
DFS of Graph
Stack using Linked List
BFS of graph
Identical Trees
Root to leaf path sum
Square Root
Lowest Common Ancestor in a BST
Binary Search
Remove Duplicates Sorted Array
Level Order Line by Line
BST Keys in a Range
Unique rows in boolean matrix
Josephus problem
You and your books
Delete in a Singly Linked List
Kth largest element in BST
Special Stack
Level order traversal
Reverse Using Stack
Huffman Decoding-1
Maximum Node Level
Find length of Loop
Queue Reversal
Reverse first K of a Queue
Sum of Leaf Nodes
Closest Neighbour in BST
Delete Mid of a Stack
Coin Change - Number of ways
Check K-th Bit
Equilibrium Point
Array Leaders
Floor in a Sorted Array
Print adjacency list
Transpose of Matrix
Rotate by 90 degree
Winner of an election
Reverse Words
Parenthesis Checker
Generate Binary Numbers
Minimum Cost of ropes
N meetings in one room
Largest number with given sum
Count number of hops
First Repeating Element
Missing in Array
Search an element in sorted and rotated array
Rob The Houses
Missing And Repeating
Count the elements
Maximum Gap
Find the closest number
Sorted and Rotated Minimum
Maximum no of 1's row
Next greater number set digits
Min sum formed by digits
Minimize the sum of product
Chocolate Distribution Problem
Count the triplets
Maximum Sum Bitonic Subsequence
Left most and right most index
Sort in specific order
Remove Duplicates
Jumping Caterpillars
Twice Counter
Convert array into Zig-Zag fashion
Number of occurrence
Does array represent Heap
Longest Common Prefix of Strings
Two sum -Pairs with 0 Sum
At Least K Occurrences
Element with left side smaller and right side greater
Count the Zeros
Pattern Searching
Print Bracket Number
Shop in Candy Store
Minimum Operations
Number of 1 Bits
Maximum Sum Problem
Minimum number of Coins
Maximum height of the staircase
Adjacents are not allowed
Maximize Toys
Largest number possible
Smallest number by rearranging digits of a given number
Tom and Jerry
Sum of dependencies in a graph
Count all possible paths from top left to bottom right
Sorting Elements of an Array by Frequency
Rotate a Linked List
Add Number Linked Lists
Detect Loop in linked list
Count BST nodes that lie in a given range
Merge Sort
Quick Sort
Bottom View of Binary Tree
Intersection in Y Shaped Lists
Diameter of a Binary Tree
Merge two sorted linked lists
Sum Tree
Connect Nodes of Levels
Directed Graph Cycle
Undirected Graph Cycle
LCA in Binary Tree
Maximum difference between node and its ancestor
Two Stacks in an Array
Topological sort
Find the number of islands
Get Min from Stack
Gas Station
Clone a Binary Tree
Remove loop in Linked List
Largest BST
Sorted subsequence of size 3
Minimum Swaps to Sort
Implement Atoi
Maximum Difference
Rat in a Maze Problem - I
Pots of Gold Game
Count distinct elements in every window
k-Anagram
Sort a stack
Duplicate Subtree
k-th Smallest in BST
Ancestors in Binary Tree
Vertical sum
Isomorphic Trees
Largest Independent Set Problem
Children Sum in a Binary Tree
Kth Ancestor in a Tree
ZigZag Tree Traversal
Count Number of SubTrees having given Sum
Ceil in BST
Smallest Positive Missing
Rearrange Array Alternately
Rearrange an array with O(1) extra space
Stock buy and sell
Rotate Array
Kadane's Algorithm
Majority Element
Smallest Positive missing number
Unique BST's
Indexes of Subarray Sum
Boolean Matrix
Spirally traversing a matrix
Search in a sorted Matrix
Possible paths between 2 vertices
Stock span problem
Next Greater Element
K Sized Subarray Maximum
Kth smallest element
Activity Selection
Fractional Knapsack
Job Sequencing Problem
Minimum Platforms
Stickler Thief
Egg Dropping Puzzle
Optimal Strategy For A Game
Minimum number of jumps
Longest Increasing Subsequence
Longest Common Subsequence
0 - 1 Knapsack Problem
Number of Unique Paths
Sort according to an Array
Find whether path exist
Shortest Common Supersequence
Rotten Oranges
Maximize The Cut Segments
Sort 0s, 1s and 2s
Maximum Index
Sum of Middle elements of two sorted arrays
Single Among Doubles in a Sorted
Consecutive 1's not allowed
Single Among Doubles
Pythagorean Triplet
Pair Sum Closest to 0
Search in Rotated Sorted Array
Row with max 1s
Swapping pairs make sum equal
Substrings with K Distinct
Nuts and Bolts Problem
Count the Reversals
Max Sum without Adjacents
Reverse each word in a given string
k largest elements
Magnet Array Problem
Longest Common Substring
Longest substring with distinct characters
K-th element of two Arrays
Rod Cutting
LCS of three strings
Longest Common Increasing Subsequence
Minimize the Heights II
Valid Substring
Unique Number II
Bleak Numbers
Max Sum Increasing Subsequence
Coin Change (Count Ways)
Sieve of Eratosthenes
Coin Change (Minimum Coins)
Perfect Sum Problem
Count ways to N'th Stair(Order does not matter)
Knapsack with Duplicate Items
Maximum path sum in matrix
Special Keyboard
Longest Bitonic subsequence
Number of paths
Card Rotation
Choose and Swap
Jumping Numbers
Longest Repeating Subsequence
Decode the string
Total Decoding Messages
Stream First Non-repeating
Possible paths
Kth Largest in a Stream
Snake and Ladder Problem
Flood fill Algorithm
Rotate Array
Print Linked List
Count Linked List Nodes
Size of Binary Tree
Count Leaves in Binary Tree
Postorder Traversal
Implement stack using array
Queue using Linked List
Queue Using Array
Preorder Traversal
First Occurence
Sum Except First and Last
Search a node in BST
Palindromic Array
Peak element
Linked List Insertion At End
Minimum element in BST
Is Linked List Length Even?
Triplet Family
Sum of Binary Tree
Insert in Middle of Linked List
Count Non-Leaf Nodes in Tree
Who has the majority?
Reverse array in groups
Adding two matrices
Multiply the matrices
Binary String
Keypad typing
First n Fibonacci
Value equal to index value
Immediate Smaller Element
Uncommon characters
Remove repeated digits in a given number
String with numbers at its end
Exceptionally odd
Ishaan Loves Chocolates
Jay's Apples
Rotating an Array
GCD of Array
Check set bits
Set kth bit
Factor OR Multiple
Find the fine
LCM And GCD
Median of an Array
G.F Series
Middle of Three
Linked List Group Reverse
Binary Tree to DLL
Min distance between two given nodes of a Binary Tree
Max rectangle
Box Stacking
Nodes at given distance in binary tree
Fixing Two nodes of a BST
Max Path Sum 2 Special Nodes
Huffman Decoding
Trapping Rain Water
Histogram Max Rectangular Area
Max of min for every window size
Find median in a stream
Merge Without Extra Space
The Painter's Partition Problem-II
Edit Distance
Minimum sum partition
Stock Buy and Sell – Max K Transactions Allowed
Longest valid Parentheses
Akku and Arrays
Reverse an Array
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