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GeeksforGeeks
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C++, C, Java
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SCHOOL (1)
BASIC (41)
EASY (182)
MEDIUM (183)
HARD (20)
- Reverse a linked list
- Pairwise swap elements of a linked list
- Linked list of strings forms a palindrome
- Delete nodes having greater value on right
- Remove duplicates from an unsorted linked list
- Delete in a Doubly Linked List
- Inorder Traversal
- Bubble Sort
- Selection Sort
- Insertion Sort
- Check for BST
- Right View of Binary Tree
- Mirror Tree
- Delete without head pointer
- Height of Binary Tree
- Balanced Tree Check
- Kth from End of Linked List
- Middle of a Linked List
- Left View of Binary Tree
- Remove Duplicates from a Sorted Linked List
- Stack using two queues
- Level Order in spiral form
- Reverse Level Order Traversal
- DFS of Graph
- Insert a node in a BST
- BFS of graph
- Identical Trees
- Root to leaf path sum
- Square Root
- Binary Search
- Remove Duplicates Sorted Array
- Binary Tree to BST
- Unique rows in boolean matrix
- Toeplitz matrix
- Third largest element
- Multiply two linked lists
- You and your books
- Delete in a Singly Linked List
- Array Duplicates
- Three way partitioning
- Level order traversal
- Inorder Successor in BST
- Insert in a Sorted List
- Split Linked List Alternatingly
- Sum of leaf nodes in BST
- More than n/k Occurrences
- Counting Sort
- Symmetric Tree
- Find the Sum of Last N nodes of the Linked List
- Find length of Loop
- Median of BST
- Linked List Matrix
- Queue Reversal
- Reverse first K of a Queue
- Closest Neighbour in BST
- Delete Mid of a Stack
- Xoring and Clearing
- Frequency in Queue
- Get min at pop
- Frequency Game
- First Set Bit
- Check K-th Bit
- Power of 2
- Wave Array
- Equilibrium Point
- Array Leaders
- Floor in a Sorted Array
- Print adjacency list
- Transpose of Matrix
- Rotate by 90 degree
- Anagram
- String Rotated by 2 Places
- Strings Rotations of Each Other
- Isomorphic Strings
- Reverse Words
- Minimum indexed character
- Panagram Checking
- Non Repeating Character
- Parenthesis Checker
- Minimum Cost of ropes
- Count number of hops
- Union of Arrays with Duplicates
- Missing in Array
- Product array puzzle
- Roman Number to Integer
- Intersection of Arrays with Distinct
- Max Value Permutation
- Missing And Repeating
- Professor and Parties
- Adding Ones
- Move All Zeroes to End
- Chocolate Distribution Problem
- Left most and right most index
- Closest Strings
- Alternate Positive Negative
- Remove Duplicates
- Add two numbers represented by two arrays
- Reorganize The Array
- Facing the sun
- Second Largest
- Two Sum - Pair with Given Sum
- Rotate Bits
- Number of occurrence
- K-Pangrams
- Reversing the equation
- Does array represent Heap
- Convert an array to reduced form
- Find missing in second array
- Longest Common Prefix of Strings
- First Repeated Character
- Min Number of Flips
- Two sum -Pairs with 0 Sum
- At Least K Occurrences
- Palindrome String
- Total count
- Fitting The Array
- Print Bracket Number
- Odd Even Problem
- Convertible string
- Is Binary Number Multiple of 3
- Padovan Sequence
- Extract the Number from the String
- Divisibility by 8
- Number of 1 Bits
- Find the Highest number
- Armstrong Numbers
- Reverse Bits
- Max Sum Subarray of size K
- Party of Couples
- Count numbers containing 4
- The Bit Game
- Nearest Perfect Square
- Minimum number of Coins
- Perfect Numbers
- The Palindrome Pattern
- Compare two fractions
- Least Prime Factor
- Sum of First N Natural Numbers
- Juggler Sequence
- Tom and Jerry
- Maximum Diamonds
- Row with Minimum 1s
- Coverage of all Zeros in a Binary Matrix
- Trace Path
- Inorder Traversal and BST
- Sum of dependencies in a graph
- Ball coloring
- Modified Numbers and Queries
- Sum of k smallest elements in BST
- Reverse Bits
- Queue using stack
- Maximum number of 2X2 squares
- First and last occurrences of x
- License Key Formatting
- Smallest Subset with Greater Sum
- Minimum Sum of Absolute Differences of Pairs
- Move Last Element to Front of a Linked List
- Find pairs with given sum in doubly linked list
- Maximum Depth Of Binary Tree
- Divisor Game
- Bit Manipulation
- Last modified ball
- Transform to Sum Tree
- Parent of Max GCD Siblings in a Binary Tree
- Frogs and Jumps
- Equal Left and Right Subarray Sum
- Make the array beautiful
- Taxi Booking
- Binary matrix having maximum number of 1s
- Number of Subarrays of 0's
- Bus Conductor
- Minimum Number
- Minimum Integer
- Array Operations
- Valuable String
- Ticket Counter
- Unique Number of Occurrences
- Maximum Number
- Check Anagram Existence
- Eye's Contact
- Split an array into two equal Sum subarrays
- Largest Pair Sum
- Rotate a Linked List
- Sort a linked list of 0s, 1s and 2s
- Add 1 to a Linked List Number
- Detect Loop in linked list
- Insert in Sorted Circular Linked List
- Merge Sort
- Quick Sort
- Diameter of a Binary Tree
- Heap Sort
- Merge two sorted linked lists
- Sum Tree
- Delete a node from BST
- Directed Graph Cycle
- Undirected Graph Cycle
- LCA in Binary Tree
- Two Stacks in an Array
- Max sum path in two arrays
- The Celebrity Problem
- Topological sort
- Find the number of islands
- Find kth element of spiral matrix
- Wildcard Pattern Matching
- Check if subtree
- Validate an IP Address
- Remove loop in Linked List
- Dijkstra Algorithm
- Minimum Spanning Tree
- Sorted subsequence of size 3
- Palindrome Linked List
- Strongly Connected
- Rat in a Maze Problem - I
- Bipartite Graph
- Merge two BST 's
- Find triplets with zero sum
- Root to Leaf Paths
- XOR Linked List
- Construct Tree from Inorder & Preorder
- Insert in Sorted way in a Sorted DLL
- Deletion and Reverse in Circular Linked List
- ZigZag Tree Traversal
- Mother Vertex
- Tower Of Hanoi
- Smallest Positive Missing
- Rotate and delete
- Rearrange Array Alternately
- Rearrange an array with O(1) extra space
- Stock buy and sell
- Rotate Array
- Kadane's Algorithm
- Majority Element
- Two Repeated Elements
- Union of 2 Sorted Arrays
- Indexes of Subarray Sum
- Triplet Sum in Array
- Merge Without Extra Space
- Possible paths between 2 vertices
- Spirally traversing a matrix
- Distance of nearest cell having 1
- Subarray with 0 sum
- Sort Elements by Decreasing Frequency
- Longest Consecutive Subsequence
- Next Greater Element
- Fractional Knapsack
- Minimum Platforms
- Combination Sum
- M-Coloring Problem
- Minimum Jumps
- Stickler Thief
- Longest Increasing Subsequence
- Longest Common Subsequence
- 0 - 1 Knapsack Problem
- X Total Shapes
- Find whether path exist
- Kth Smallest
- Implement Trie
- Rotten Oranges
- Maximize The Cut Segments
- Rotate by 90 degree
- Closest Three Sum
- Word Break
- Stock Buy and Sell – Multiple Transaction Allowed
- Generate Parentheses
- Word Search
- Prerequisite Tasks
- Sort 0s, 1s and 2s
- Single Among Doubles in a Sorted
- Single Among Doubles
- Search in Rotated Sorted Array
- Max Score from Subarray Mins
- Maximum Product Subarray
- Row with max 1s
- Form a palindrome
- Max Sum without Adjacents
- Factorials of large numbers
- Shuffle integers
- k largest elements
- Longest Common Substring
- Longest substring with distinct characters
- Longest Substring with K Uniques
- Longest Palindrome in a String
- Valid Expression
- K-th element of two Arrays
- Minimum swaps and K together
- First negative in every window of size k
- Minimize the Heights II
- Permutations of a String
- Subarrays Product Less than K
- Unique Number II
- Minimum number of deletions and insertions
- Minimum cost to fill given weight in a bag
- Sieve of Eratosthenes
- Perfect Sum Problem
- Longest subsequence-1
- Power Set
- Count ways to N'th Stair(Order does not matter)
- Minimum Cost To Make Two Strings Identical
- Partition Equal Subset Sum
- Matchsticks game
- Subset Sums
- Prime Pair with Target Sum
- Nth Natural Number
- Find the Safe Position
- Smaller on Left
- Stream First Non-repeating
- Replace O's with X's
- Find all distinct subset (or subsequence) sums
- Floyd Warshall
- Flood fill Algorithm
- Reverse Spiral Form of Matrix
- Help Classmates
- Subset Sum Problem
- Longest Palindromic Substring
- Search Pattern (Rabin-Karp Algorithm)
- Bellman-Ford
- Subarrays with sum K
- Number of Provinces
- Prefix match with other strings
- Maximum sum leaf to root path
- Find duplicate rows in a binary matrix
- Paths from root with a specified sum
- Minimize the Heights I
- Subsets
- Course Schedule
- Reverse a Stack
- Buy Maximum Stocks
- Smallest sum contiguous subarray
- Number of Distinct Islands
- Shortest Distance in a Binary Maze
- Minimum Multiplications to reach End
- Number Of Enclaves
- Eventual Safe States
- City With the Smallest Number of Neighbors at a Threshold Distance
- Number Of Islands
- Number of Ways to Arrive at Destination
- Path With Minimum Effort
- Cheapest Flights Within K Stops
- Connecting the graph
- Shortest Path in Undirected Graph
- Maximum Stone Removal
- Shortest path in Directed Acyclic Graph
- Longest subarray with Atmost two distinct integers
- Minimal Cost
- Subset II
- Combination Sum II
- Shortest Path in Weighted undirected graph
- Lemonade Change
- Maximum Sum Combination
- Count Number of Nodes in a Binary Tree
- Print Longest Increasing Subsequence
- Partitions with Given Difference
- Maximum Value
- Geeks And The String
- Minimum Steps Required
- Distinct Difference
- Remove the balls
- Prefix Suffix String
- Smaller Sum
- Nearest smaller tower
- Good Subtrees
- Add Minimum Characters
- Find Kth permutation
- Maximum Doublet XOR
- Find All Triplets with Zero Sum
- Count Leaves in Binary Tree
- Implement stack using array
- Replace all 0's with 5
- Print number pattern
- First Occurence
- Search a node in BST
- Identical Linked Lists
- Sort and Reverse Vector
- Number is sparse or not
- Print 1 To N Without Loop
- Reverse array in groups
- Array Search
- Binary String
- Most Frequent Character
- Reverse a String
- First n Fibonacci
- Sort a String
- Check if divisible by 4
- Remove all characters other than alphabets
- Count the characters
- Uncommon characters
- Repeated Character
- Last index of One
- Rotate Array by One
- Exceptionally odd
- Ishaan Loves Chocolates
- Array Subset
- Rotating an Array
- C++ Strings
- Maximum Perimeter of Triangle from array
- Remove character
- GCD of two numbers
- C++ Input / Output
- Binary representation
- Set kth bit
- LCM And GCD
- Factorial
- Prime Number
- Floyd's triangle
- Naughty Geek
- Maximize Expression
- Linked List Group Reverse
- Binary Tree to DLL
- Clone List with Next and Random
- Alien Dictionary
- String Permutations
- Trapping Rain Water
- Smallest window containing all characters of another string
- Word Ladder I
- Circle of strings
- Edit Distance
- Matrix Chain Multiplication
- Longest valid Parentheses
- N-Queen Problem
- Longest Path in a matrix
- Word Ladder II
- Articulation Point - I
- Maximum Connected group
- MaxSkill
- Account Merge
- Chocolates Pickup
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