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SCHOOL (2)
BASIC (121)
EASY (206)
MEDIUM (344)
HARD (57)
Nearly Sorted Algorithm
Add 1 to a Linked List Number
Quick Sort on Linked List
QuickSort on Doubly Linked List
Count BST nodes that lie in a given range
Merge Sort
Bottom View of Binary Tree
Merge two sorted linked lists
Add all greater values to every node in a BST
Sum Tree
Flattening a Linked List
Diagonal Tree Traversal
Tree Boundary Traversal
Delete a node from BST
Directed Graph Cycle
Undirected Graph Cycle
Maximum difference between node and its ancestor
Absolute List Sorting
Binary Heap Operations
Largest subarray with 0 sum
Topological sort
Merge K sorted linked lists
Find the number of islands
Get Min from Stack
Generate IP Addresses
Check if subtree
Kth smallest element in a Matrix
Is Binary Tree Heap
Dijkstra Algorithm
Minimum Spanning Tree
Largest BST
Count Palindromic Subsequences
Minimum Swaps to Sort
Palindrome Linked List
Strongly Connected
Rat in a Maze Problem - I
Bipartite Graph
Pots of Gold Game
Count distinct elements in every window
Merge k Sorted Arrays
Longest Palindrome in Linked List
Bridge edge in a graph
Sort a stack
Top View of Binary Tree
k-th Smallest in BST
Find Common Nodes in two BSTs
Peak element
Polynomial Addition
Delete nodes greater than k
Euler circuit and Path
Root to Leaf Paths
Occurences of 2 as a digit
Counting elements in two arrays
Construct expression tree
Foldable Binary Tree
Leftmost and rightmost nodes of binary tree
Construct Tree from Inorder & Preorder
Predecessor and Successor
Leaves to DLL
Count Number of SubTrees having given Sum
C++ Generic sort
Swap Kth nodes from ends
Add two numbers represented by Linked List
Maximum sum of Non-adjacent nodes
Mother Vertex
Ceil in BST
Count set bits
Tower Of Hanoi
Smallest Positive Missing
Power Of Numbers
Wave Array
Possible Words From Phone Digits
Rearrange Array Alternately
Rearrange an array with O(1) extra space
Maximum Index
Kadane's Algorithm
Majority Element
Binary Array Sorting
Count Inversions
Indexes of Subarray Sum
Possible paths between 2 vertices
Search in a sorted Matrix
Rotate by 90 degree
Unit Area of largest region of 1's
Subarray with 0 sum
Subarrays with equal 1s and 0s
Case-specific Sorting of Strings
Postfix Evaluation
Stock span problem
Next Greater Element
K Sized Subarray Maximum
Nearly sorted
Activity Selection
Fractional Knapsack
Job Sequencing Problem
Minimum Platforms
Largest number in K swaps
Combination Sum
Unique Subsets
M-Coloring Problem
Minimum Jumps
Stickler Thief
Ways to Reach the n'th Stair
Egg Dropping Puzzle
Longest Common Subsequence
0 - 1 Knapsack Problem
Lucky Numbers
Number of Unique Paths
Sort according to an Array
Preorder to BST
X Total Shapes
Zero Sum Subarrays
Find whether path exist
Kth Smallest
Implement Trie
Shortest Common Supersequence
Rotten Oranges
Steps by Knight
Count subsequences of type a^i, b^j, c^k
Print Anagrams Together
Rotate by 90 degree
Top K Frequent in Array
Word Break
Generate Parentheses
Word Search
Excel Sheet | Part - 1
Sort 0s, 1s and 2s
Equivalent Sub-Arrays
Pair Sum Closest to 0
Search in Rotated Sorted Array
Smallest number with at least n trailing zeroes in factorial
Maximize The Array
Max Score from Subarray Mins
Form the Largest Number
Efficiently sorting numbers in range from 0 to n^2 - 1
Super Primes
Maximum Product Subarray
Longest subarray with sum divisible by K
Concatenation of Zig-Zag String in n Rows
Form a palindrome
Nuts and Bolts Problem
Longest Subarray with Sum K
Transform String
Count the Reversals
Number of positive integral solutions
Sum of two large numbers
Max Sum without Adjacents
Shuffle integers
Reverse each word in a given string
k largest elements
Magnet Array Problem
Smallest distinct window
Count of substrings containing K ones
Valid Expression
Integer to Words
K-th element of two Arrays
Arranging the array
String formation from substring
Rod Cutting
Minimum swaps and K together
Maximize the sum of selected numbers from a sorted array to make it empty
Smallest Absolute Difference
LCS of three strings
First negative in every window of size k
Minimum sum
First and Last Occurrences
Reaching the heights
Smaller on Left
Maximum Product of Increasing Subsequence of Size 3
Nine Divisors
Valid Substring
Permutations of a String
Previous number in one swap
Friends Pairing Problem
Lexicographically smallest string
Subarrays Product Less than K
Ways to sum to N
Game of XOR
Max Sum Increasing Subsequence
Coin Change (Count Ways)
Gold Mine Problem
Coin Change (Minimum Coins)
Perfect Sum Problem
Kth Smallest Factor
Firing employees
Power Set
Count ways to N'th Stair(Order does not matter)
Minimum Cost To Make Two Strings Identical
nCr
Number of ways
Subsets with XOR value
Maximum path sum in matrix
Partition Equal Subset Sum
XOR Game
Min Coin
Lucky alive person in a circle
Handshakes
Count possible ways to construct buildings
Count digit groupings of a number
Probability of Knight
Brain Game
Money Distributions
Find Last Digit Of a^b for Large Numbers
Killing Spree
Subset Sums
N Digit numbers with digits in increasing order
Yes XOR No
Fill the Tank
Nth Natural Number
Knight Walk
Stepping Numbers
Permutation with Spaces
Choose and Swap
Return two prime numbers
Find nth root of m
Fact Digit Sum
Find Prime numbers in a range
Party in Town
Find the Safe Position
Next Permutation
Smaller on Left
Geek and knots
Filling Bucket
Matrix Exponentiation
Finding Profession
Decode the string
Villain Con
Possible paths
Print leaf nodes from preorder traversal of BST
Tricky Subset Problem
Rat Maze With Multiple Jumps
Geek and Strings
Pairs of Non Coinciding Points
The Smurfs
Satisfy the equation
7 Segment Display
Product of Primes
Eulerian Path in an Undirected Graph
nCr mod M | Part 2
Find all distinct subset (or subsequence) sums
Rohan's Love for Matrix
Check Mirror in N-ary tree
Queries on Strings
Special Matrix
Queries on a Matrix
Broken blocks
Shortest Uncommon Subsequence
Nodes at even distance
Biconnected Graph
Help a Thief!!!
Count the paths
Floyd Warshall
Negative weight cycle
Form coils in a matrix
Base Equivalence
Shortest Path between Cities
Moving on grid
Height Using Parent Array
Reverse Spiral Form of Matrix
Save Your Life
Hamiltonian Path
Recursively Remove Adjacent Duplicates
Theft at World Bank
Number of minimum picks to get 'k' pairs of socks from a drawer
Coins of Geekland
Transfiguration
Ruling Pair
Triplets in Sorted Linked List
Help Classmates
Valentine Sum
Lucy's Neighbours
Spidey Sense
Escape the Forbidden Forest
Jump Game
Iterative Inorder
Triplets with sum with given range
Preorder traversal (Iterative)
Iterative Postorder
Subset Sum Problem
Form a palindrome
Search Pattern (Z-algorithm)
All Palindromic Partitions
Covid Spread
Bellman-Ford
Gray Code
Subarrays with sum K
Partition a Linked List around a given value
Minimum XOR value pair
Searching an element in a sorted array (Ternary Search)
Capacity To Ship Packages Within D Days
Coin Piles
Substrings of length k with k-1 distinct elements
Clone a stack without using extra space
Count pairs in array divisible by K
Number of Provinces
Prefix match with other strings
Binary Matrix with at most K 1s
Maximum sum leaf to root path
Find duplicate rows in a binary matrix
Maximum GCD of siblings of a binary tree
BST to greater sum tree
Find rectangle with corners as 1
Cousins of a given node
Division without using multiplication, division and mod operator
Sort for Singly Linked List
Subsets
Flatten binary tree to linked list
Rank The Permutations
IPL 2021 - Match Day 2
Course Schedule
Find and Replace in String
Minimum times A has to be repeated such that B is a substring of it
Bitwise AND of the Array
Bitwise AND of the Array
Maximum number of events that can be attended
Longest Possible Route in a Matrix with Hurdles
Farthest number
Robots
Hit most Balloons
Enemy
Concatenate Equal to Target
Exactly one swap
Compute Before Matrix
Levels Of Game
Smallest sum contiguous subarray
Array Removals
Minimum Cost to cut a board into squares
Stack Permutations
Replace every element with the least greater element on its right
Special Keyboard 2
Maximum selections
LCP
Next element with greater frequency
Sum of nodes within k distance from target
Minimum increment/decrement to make array non-Increasing
Number of Distinct Islands
Shortest Distance in a Binary Maze
Number Of Islands
Merging Details
Frog Jump
Minimal Cost
Maximum Sum Combination
Replace elements by its rank in the array
Index of the First Occurrence of pattern in a text
Geek-onacci Number
The Hiring Contest
3 Data structures
Reverse a linked list
Delete in a Doubly Linked List
Bubble Sort
Right View of Binary Tree
Mirror Tree
Delete without head pointer
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
Reverse Level Order Traversal
DFS of Graph
BFS of graph
Identical Trees
Square Root
Lowest Common Ancestor in a BST
Minimum Depth of a Binary Tree
Equilibrium index of an array
Josephus problem
Java Collection | Set 1 (ArrayList) Part-2
You and your books
Max distance between same elements
Kth largest element in BST
Special Stack
Level order traversal
Index of an Extra Element
Increment a variable
Max and min element in Binary Tree
Reverse Using Stack
Full Binary Tree
Symmetric Tree
Next Right Node
Count Pairs whose sum is equal to X
Find length of Loop
Find n/k th node in Linked list
Linked List Matrix
Reverse first K of a Queue
Move all zeros to the front of the linked list
Delete Mid of a Stack
Java Collections | Set 7 (LinkedList)
Learn to Comment
While loop- printTable
Learning Macros
Start Coding - Java
Learn to Comment - Java
Bitwise Operators - Java
While loop- printTable - Java
Swap the array elements
Xoring and Clearing - Java
Swap the objects
Learning Structs
Delete Array
Maximum Area Rectangle
Sum of Big Integers
BigInteger Multiply
Pair Sum in Vector
Java ArrayList Operation
Reverse an Array
Stack Operations
Frequency in Queue
Operations on PriorityQueue
Get min at pop
Min Heap implementation
Frequency Game
Longest Consecutive 1's
Swap odd and even bits
Equilibrium Point
Array Leaders
Floor in a Sorted Array
Minimum Number in a sorted rotated array
Print adjacency list
Anagram
Isomorphic Strings
Reverse Words
Panagram Checking
Non Repeating Character
Parenthesis Checker
Generate Binary Numbers
K largest elements
Minimum Cost of ropes
N meetings in one room
Largest number with given sum
Reach a given score
Union-Find
First Repeating Element
Common Elements
Check Equal Arrays
Positive Negative Pair
Missing in Array
Search an element in sorted and rotated array
Mean of range in array
Max Value Permutation
Missing And Repeating
Pairs of equals Sum
Find Kth Rotation
Sort by Set Bit Count
Maximize sum after K negations
Pairs with certain difference
Sorted and Rotated Minimum
Sum of elements between k1'th and k2'th smallest elements
String Duplicates Removal
Min sum formed by digits
String Manipulation
Form a Triangle
Bitonic Point
Alternate Positive Negative
Largest Even Number
Convert a sentence into its equivalent mobile numeric keypad sequence
Remove b and ac from a given string
Check if the number is balanced
Count Alphabets
Rearrange a string
Remove Duplicates
Reverse alternate words
Facing the sun
Two Sum - Pair with Given Sum
Check if array contains contiguous integers
Number of occurrence
Reversing the equation
Longest common prefix
Check if array is sorted
Find missing in second array
Longest Common Prefix of Strings
Counts Zeros Xor Pairs
Segregate 0s and 1s
Play With OR
Hungry Pizza Lovers
Maximum sum of increasing order elements from n arrays
Count the Zeros
Distinct absolute array elements
Merge two binary Max heaps
Four Elements
Palindrome String
Maximum average subarray
Total count
Smallest greater elements in whole array
Fitting The Array
Print Bracket Number
Divisible by 7
Shop in Candy Store
Partition a number into two divisible parts
Encrypt the string - 2
Replace a word
Adding Array Elements
Number of 1 Bits
Find the Highest number
Armstrong Numbers
Midori and chocolates
Max Sum Subarray of size K
Nth Fibonacci Number
Change Bits
Sum Of Digits
Palindrome
Prime Number
Count numbers containing 4
Find maximum number
Swap bits
Minimum number of Coins
Nth item through sum
Smallest number with sum of digits as N and divisible by 10^N
Squares in N*N Chessboard
Subtraction and two numbers
Circular Prime Number
Tom and Jerry
Summed Matrix
Help Ishaan
Playing with mobile numbers
Sequence Fun
Help the Old Man!!!
Counting number of sentences and words in text
Print Pattern
Print the pattern
Chicks in a Zoo
K-Ary Tree
Minimum Exchange
Earthquake and the Paint Shop
Array to BST
Count all possible paths from top left to bottom right
Rearrange Geek and his Classmates
Modified Numbers and Queries
Fraction Trouble
Sum of k smallest elements in BST
Print Diagonally
Gadgets of Doraland
Sum of two numbers without using arithmetic operators
Even and Odd
Search insert position of K in a sorted array
Largest value in each level
Maximum number of 2X2 squares
Find all possible paths from top to bottom
Minimum Sum of Absolute Differences of Pairs
Smallest window containing 0, 1 and 2
Move Last Element to Front of a Linked List
Can Make Triangle
Matrix Operations
Find pairs with given sum in doubly linked list
Triangle and Square
Search in Linked List
Introduction to Trees
Graph and Vertices
Binary Tree Representation
Reorder List
Binary Tree to DLL
Partition array to k subsets
Number of Turns in Binary Tree
Trapping Rain Water
Max Circular Subarray Sum
Histogram Max Rectangular Area
Max of min for every window size
Burning Tree
Distinct palindromic substrings
Count Smaller elements
Largest rectangle of 1s with swapping of columns allowed
Print all LCS sequences
Maximum XOR subset
Minimum sum partition
Number Formation
Palindromic Partitioning
Next Happy Number
Matrix Chain Multiplication
Median in a row-wise sorted Matrix
Kill Captain America
Bike Racing
Word Break - 2
N-Queen Problem
Brackets in Matrix Chain Multiplication
nCr mod M | Part 1
Phone directory
Adventure in a Maze
Closest Palindrome
Optimal binary search tree
Assignment Problem
Longest Path in a matrix
Word Wrap
Maximum sum Rectangle
Let's Play!!!
Huffman Encoding
Find the Maximum Flow
Secret Cipher
132 Geeky Buildings
Corona Vaccine
Shortest Range In BST
Longest substring to form a Palindrome
Minimum X (xor) A
Word Break (Trie)
Sorted Linked List to BST
Palindrome Pairs
Array Partition
Count occurrences of a given word in a 2-d array
Number of distinct words with K maximum contiguous vowels
Reverse a sublist of a linked list
Word Ladder II
Shortest Unique prefix for every word
Count the number of subarrays
Kth Smallest Number in Multiplication Table
Min Chars to Add for Palindrome
Minimum time to fulfil all orders
Geek in a Maze
Rotate Array
Count Linked List Nodes
Size of Binary Tree
Doubly linked list Insertion at given position
Replace all 0's with 5
Replace all 0's with 5
C++ STL | Set 1 (vector)
Sum Except First and Last
Search a node in BST
HashMap Operations
Linked List Insertion At End
C++ Functions (Sum of numbers) | Set 1
Anagram of String
Mrs. S- JAVA Bits Set 1
Java Inheritance
Java Abstract keyword
Java Classes Introduction
Sort and Reverse Vector
Front to Back
Bit Difference
Print 1 To N Without Loop
Array Search
Binary String
Most Frequent Character
Sum of numbers in string
Reverse a String
C++ Hello World
Sum of Array
Doubling the value
Print Elements of Array
Sort a String
Sort The Array
Change the string
Value equal to index value
Check String
Convert a list of characters into a String
Count of camel case characters
Fighting the darkness
Immediate Smaller Element
Count type of Characters
Lower case to upper case
Remove Spaces
Repeated Character
First 1 in a Sorted Binary Array
Elements in the Range
Display longest name
Find element at a given Index
Last index of One
Sort the string in descending order
Largest Element in Array
Game with nos
One odd Occuring
Ishaan Loves Chocolates
Array Subset
Product is even or odd?
Minimum number to form the sum even
C++ Strings
Count of smaller elements
Multiply left and right array sum
Print first letter of every word in the string
Last index of a character in the string
Remove character
Red OR Green
Convert String to LowerCase
Delete alternate characters
Reverse a String
Java Strings | Set 1
Java Substring
Magical String[Duplicate Problem]
GCD of two numbers
Addition of Two Numbers
C++ Input / Output
1s Complement
Odd or Even
Check set bits
The OR Gate
Even Odd Sum
Find position of set bit
Set kth bit
Decision Making in Java
Java Hello World
Java loops | Set 1
LCM And GCD
Small Factorial
House Robber
Mean of an Array
Maximum Area
Find n-th term of series 1, 3, 6, 10, 15, 21
Find N-th term in the series
Sum of odd and even elements
Sum of Digit is Palindrome or not
Sum of an AP
Greatest of three numbers
Reverse digits
Special Odd Series Sum
Special Series Sum
Power of Pow | Even Number
Power of Pow | Odd Numbers
Binary number to decimal number
Series AP
Floyd's triangle
Sum of elements in a matrix
Java 1-d and 2-d Array
Multiplication Table
The dice problem
Java Basic Data Types
Remainder Evaluation
Print 1 to n without using loops
Matching Pair
Anshuman's Favourite Number
Repeated sum of digits
Mind Game
Swap two numbers
12 hour clock Multiplication
Maximum Handshakes
Half N by M
Sum of product of x and y with floor(n/x) = y
nPr
Prime number validation-JAVA regex
Java Collection | Set 3 (HashMap) Part-1
Max Min
Search in a 2D Matrix
Arrays (Sum of array)
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