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SCHOOL (1)
BASIC (25)
EASY (90)
MEDIUM (90)
HARD (7)
Sorting Elements of an Array by Frequency
Sort a linked list of 0s, 1s and 2s
Add 1 to a Linked List Number
Detect Loop in linked list
Count BST nodes that lie in a given range
Bottom View of Binary Tree
Delete without head pointer
Intersection in Y Shaped Lists
Diameter of a Binary Tree
Merge two sorted linked lists
Sum Tree
Diagonal Tree Traversal
Directed Graph Cycle
Undirected Graph Cycle
LCA in Binary Tree
Two Stacks in an Array
The Celebrity Problem
Largest subarray with 0 sum
Topological sort
Vertical Tree Traversal
Find the number of islands
Get Min from Stack
Gas Station
Check if subtree
Largest BST
Palindrome Linked List
Rat in a Maze Problem - I
Bipartite Graph
Count distinct elements in every window
Merge k Sorted Arrays
Sort a stack
Top View of Binary Tree
Level order traversal
Peak element
Root to Leaf Paths
Vertical sum
Smallest Positive Missing
Power Of Numbers
Rearrange Array Alternately
Stock buy and sell
Kadane's Algorithm
Majority Element
Count Inversions
Indexes of Subarray Sum
Number of pairs
Spirally traversing a matrix
Rotate by 90 degree
Postfix Evaluation
Stock span problem
Kth smallest element
Ways to Reach the n'th Stair
Longest Increasing Subsequence
0 - 1 Knapsack Problem
Largest number
K nearest Points
Number of Unique Paths
Sort according to an Array
Implement Trie
Print Anagrams Together
Rotate by 90 degree
Word Break
Sort 0s, 1s and 2s
Sum of Middle elements of two sorted arrays
Single Among Doubles in a Sorted
Count Occurences of Anagrams
Pythagorean Triplet
Search in Rotated Sorted Array
Form the Largest Number
Row with max 1s
Check if frequencies can be equal
Form a palindrome
Nuts and Bolts Problem
Rotate a Matrix
Rod Cutting
Missing element of AP
First negative in every window of size k
Minimum Deletions
Valid Substring
Minimum number of deletions
Unique Number II
Max Sum Increasing Subsequence
Coin Change (Count Ways)
Count ways to N'th Stair(Order does not matter)
Knapsack with Duplicate Items
Subset Sums
Game with String
Stream First Non-repeating
Largest square formed in a matrix
Number of Distinct Islands
Eventual Safe States
Triangle and Square
M and N
Reverse a linked list
Pairwise swap elements of a linked list
Remove duplicates from an unsorted linked list
Inorder Traversal
Check for BST
Right View of Binary Tree
Mirror Tree
Two Mirror Trees
Height of Binary Tree
Middle of a Linked List
Left View of Binary Tree
Delete Middle of Linked List
Find Transition Point
Queue using two Stacks
Remove Duplicates from a Sorted Linked List
Stack using two queues
Reverse Level Order Traversal
DFS of Graph
Stack using Linked List
Implement stack using array
Insert a node in a BST
BFS of graph
Identical Trees
Root to leaf path sum
Nodes without a Sibling
Binary Search
Largest subarray of 0's and 1's
Remove Duplicates Sorted Array
Level Order Line by Line
Josephus problem
Kth largest element in BST
Minimum distance in an Array
Array Duplicates
Max Level Sum in Binary Tree
Special Stack
Index of an Extra Element
Reverse Using Stack
Delete Alternate Nodes
Count Pairs whose sum is equal to X
Queue Reversal
Reverse first K of a Queue
Sum of Left Leaf Nodes
Delete Mid of a Stack
Get min at pop
Deque Implementations
Min Heap implementation
Equilibrium Point
Array Leaders
Floor in a Sorted Array
Check if a string is Isogram or not
Reverse Words
Parenthesis Checker
N meetings in one room
Count ways to N'th Stair
Count number of hops
Reach a given score
Numbers containing 1, 2 and 3
Missing in Array
Product array puzzle
Missing And Repeating
Non-Repeating Element
Maximum no of 1's row
Move All Zeroes to End
Chocolate Distribution Problem
Count the triplets
Find Pair Given Difference
Bitonic Point
Single Number
Remove Consecutive Characters
Addition of submatrix
Greater on right side
Count Substrings
Second Largest
Convert array into Zig-Zag fashion
Number of occurrence
Two sum -Pairs with 0 Sum
Three Great Candidates
At Least K Occurrences
Count the Zeros
Sum of Lengths of Non-Overlapping SubArrays
Print Bracket Number
Minimum Operations
Find the Highest number
Love For The Twins
Maximum height of the staircase
Even Fibonacci Numbers Sum
Squares in N*N Chessboard
Subarray with least average
Rotate Array
Find Length of Linked List
Size of Binary Tree
Count Leaves in Binary Tree
Postorder Traversal
Queue using Linked List
Queue Using Array
Replace all 0's with 5
Replace all 0's with 5
Preorder Traversal
Anagram of String
Is Linked List Length Even?
Identical Linked Lists
Stack designer
Queue Push & Pop
First n Fibonacci
C++ Hello World
Doubling the value
Uncommon characters
Remove repeated digits in a given number
Largest Element in Array
Extract Maximum
C++ Input / Output
Factorial
Finding Position
Binary Tree to DLL
Clone List with Next and Random
Trapping Rain Water
Max Circular Subarray Sum
Next Smallest Palindrome
Longest valid Parentheses
Phone directory
Reverse an Array
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