P
pankaj2025
STREAK
58/1476
days
Longest streak/Global longest streak
66 points
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66 points
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1 Point
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100 Point
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1k Point
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50k Point
4 submissions in current year
SCHOOL (0)
BASIC (17)
EASY (118)
MEDIUM (294)
HARD (54)
- Rearrange characters
- Sort a linked list of 0s, 1s and 2s
- Add Number Linked Lists
- Add 1 to a Linked List Number
- Detect Loop in linked list
- Quick Sort on Linked List
- Count BST nodes that lie in a given range
- Merge Sort
- Bottom View of Binary Tree
- Intersection in Y Shaped Lists
- Diameter of a Binary Tree
- Add all greater values to every node in a BST
- Sum Tree
- Construct Binary Tree from Parent Array
- Connect Nodes of Levels
- Flattening a Linked List
- Diagonal Tree Traversal
- Tree Boundary 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
- Merge K sorted linked lists
- Find the number of islands
- Gas Station
- Wildcard Pattern Matching
- Linked List to Binary Tree
- Check if subtree
- Extreme nodes in alternate order
- Kth smallest element in a Matrix
- Is Binary Tree Heap
- Clone a Binary Tree
- Remove loop in Linked List
- Dijkstra Algorithm
- Minimum Spanning Tree
- Largest BST
- Interleaved Strings
- Count Palindromic Subsequences
- Minimum Swaps to Sort
- Palindrome Linked List
- Strongly Connected
- Rat in a Maze Problem - I
- Bipartite Graph
- Number of root to leaf paths
- BST with Dead End
- Merge two BST 's
- Merge k Sorted Arrays
- Bridge edge in a graph
- Sort a stack
- Duplicate Subtree
- Top View of Binary Tree
- k-th Smallest in BST
- Level order traversal
- Peak element
- Ancestors in Binary Tree
- Binary Tree to CDLL
- Populate Inorder Successor for all nodes
- Construct expression tree
- K Sum Paths
- Construct Tree from Inorder & Preorder
- Isomorphic Trees
- Predecessor and Successor
- Leaves to DLL
- Largest Independent Set Problem
- Children Sum in a Binary Tree
- Duplicate Subtrees
- Construct Tree from Preorder Traversal
- Sum of nodes on the longest path
- Kth Ancestor in a Tree
- ZigZag Tree Traversal
- Swap Kth nodes from ends
- Maximum sum of Non-adjacent nodes
- Mother Vertex
- Possible Words From Phone Digits
- Rearrange Array Alternately
- Kadane's Algorithm
- Majority Element
- Binary Array Sorting
- Count Inversions
- Triplet Sum in Array
- Merge Without Extra Space
- Spirally traversing a matrix
- Distance of nearest cell having 1
- Subarray with 0 sum
- Longest Consecutive Subsequence
- Strings Rotations of Each Other
- Postfix Evaluation
- Next Greater Element
- K Sized Subarray Maximum
- Activity Selection
- Fractional Knapsack
- Job Sequencing Problem
- Minimum Platforms
- Largest number in K swaps
- Combination Sum
- M-Coloring Problem
- Minimum Jumps
- Stickler Thief
- Ways to Reach the n'th Stair
- Optimal Strategy For A Game
- Longest Increasing Subsequence
- Longest Common Subsequence
- 0 - 1 Knapsack Problem
- Sort according to an Array
- Allocate Minimum Pages
- Preorder to BST
- Zero Sum Subarrays
- Kth Smallest
- Shortest Common Supersequence
- Rotten Oranges
- Steps by Knight
- Maximize The Cut Segments
- Print Anagrams Together
- Rotate by 90 degree
- Word Break
- Prerequisite Tasks
- 4 Sum - All Quadruples
- Excel Sheet | Part - 1
- Sort 0s, 1s and 2s
- Consecutive 1's not allowed
- Painting the Fence
- Search in Rotated Sorted Array
- Smallest number with at least n trailing zeroes in factorial
- Maximum Product Subarray
- Row with max 1s
- Form a palindrome
- Count the Reversals
- Max Sum without Adjacents
- Factorials of large numbers
- Find length of longest subsequence
- Reverse each word in a given string
- Remove leading zeros from an IP address
- k largest elements
- Longest Common Substring
- Longest substring with distinct characters
- Longest Substring with K Uniques
- Longest Palindrome in a String
- Integer to Words
- K-th element of two Arrays
- Triplets with Smaller Sum
- Rod Cutting
- Minimum swaps and K together
- Smallest Absolute Difference
- LCS of three strings
- Longest Palindromic Subsequence
- First negative in every window of size k
- Maximum difference of zeros and ones in binary string
- Minimum sum
- Minimize the Heights II
- First and Last Occurrences
- Smaller on Left
- Valid Substring
- Minimum number of deletions
- Minimum Swaps for Bracket Balancing
- Permutations of a String
- Friends Pairing Problem
- Minimum number of deletions and insertions
- Max Sum Increasing Subsequence
- Minimum cost to fill given weight in a bag
- Coin Change (Count Ways)
- String Subsequence
- Mobile numeric keypad
- Coin Change (Minimum Coins)
- Perfect Sum Problem
- Smallest number
- Kth Smallest Factor
- Longest subsequence-1
- Count ways to N'th Stair(Order does not matter)
- Knapsack with Duplicate Items
- nCr
- Maximum path sum in matrix
- Partition Equal Subset Sum
- XOR Game
- Handshakes
- N Digit numbers with digits in increasing order
- Knight Walk
- Choose and Swap
- Return two prime numbers
- Find Prime numbers in a range
- Game with String
- Count even length
- Next Permutation
- Smaller on Left
- Longest Repeating Subsequence
- Longest alternating subsequence
- Preorder Traversal and BST
- Stream First Non-repeating
- Segregate even and odd nodes in a Linked List
- Largest square formed in a matrix
- 7 Segment Display
- Replace O's with X's
- Check Mirror in N-ary tree
- Special Matrix
- Biconnected Graph
- Count the paths
- Flood fill Algorithm
- Height Using Parent Array
- Hamiltonian Path
- Coins of Geekland
- Transfiguration
- Spidey Sense
- Escape the Forbidden Forest
- Jump Game
- Iterative Inorder
- Preorder traversal (Iterative)
- Iterative Postorder
- Subset Sum Problem
- Longest Palindromic Substring
- All Palindromic Partitions
- 3 Sum Closest
- Player with max score
- Capacity To Ship Packages Within D Days
- Coin Piles
- Rearrange characters
- Clone a stack without using extra space
- Number of Provinces
- Maximum sum leaf to root path
- Maximum GCD of siblings of a binary tree
- Single valued subtree
- BST to max heap
- BST to greater sum tree
- Find rectangle with corners as 1
- Cousins of a given node
- Sort for Singly Linked List
- Subsets
- Rank The Permutations
- Target Sum
- Bitwise AND of the Array
- Overlapping Intervals
- Maximum number of events that can be attended
- Maximum product subset of an array
- Robots
- Hit most Balloons
- Max Equal sum of 3 Stacks
- Buy Maximum Stocks
- Concatenate Equal to Target
- Exactly one swap
- Maximum Winning score
- Compute Before Matrix
- Minimum Cost to cut a board into squares
- Stack Permutations
- Largest subtree sum in a tree
- Expression contains redundant bracket or not
- Replace every element with the least greater element on its right
- Construct Binary Tree from String with bracket representation
- Check if all levels of two trees are anagrams or not
- Number of Distinct Islands
- Shortest Distance in a Binary Maze
- Minimum Multiplications to reach End
- Eventual Safe States
- Path With Minimum Effort
- Cheapest Flights Within K Stops
- Frog Jump
- Geek's Training
- Smaller Sum
- Minimize number of Students to be removed
- Maximum Value
- Shortest Prime Path
- Flattening a Linked List
- Absolute difference divisible by K
- Make array elements unique
- Next Greater Element in Circular Array
- Good Subarrays
- Most and Least Tasty
- Find the longest string
- Maximum Profit By Choosing A Subset Of Intervals
- Paint N Houses
- BST Downward Traversal
- Length of the longest subarray with positive product
- Count number of free cell
- Maximum Bipartite Matching
- Minimum Days
- Prime List
- Walls Coloring
- Geeks Island
- Apple Sequences
- Connect Nodes at Same Level
- Unique Paths in a Grid
- Valid Compressed String
- Fill the Matrix
- Number of Good Components
- Optimal Array
- Best Node
- Update Queries
- Good Stones
- Count Cyclic Paths
- Maximum Triplet product
- Yet another query problem
- Geek hates too many 1s
- Job Sequencing Problem
- Linked List Group Reverse
- Binary Tree to DLL
- Clone List with Next and Random
- Min distance between two given nodes of a Binary Tree
- Max rectangle
- Distinct occurrences
- LRU Cache
- Alien Dictionary
- Nodes at given distance in binary tree
- Max Path Sum 2 Special Nodes
- Trapping Rain Water
- Smallest window containing all characters
- Histogram Max Rectangular Area
- Find median in a stream
- Solve the Sudoku
- Burning Tree
- Merge Without Extra Space
- The Painter's Partition Problem-II
- Distinct palindromic substrings
- Largest rectangle of 1s with swapping of columns allowed
- Longest Prefix Suffix
- Edit Distance
- Minimum sum partition
- Palindromic Partitioning
- Stock Buy and Sell – Max K Transactions Allowed
- Matrix Chain Multiplication
- Median in a row-wise sorted Matrix
- Word Break - 2
- N-Queen Problem
- nCr mod M | Part 1
- Optimal binary search tree
- Maximum sum Rectangle
- Huffman Encoding
- Corona Vaccine
- Search Pattern (Z-algorithm)
- Search Pattern (Rabin-Karp Algorithm)
- Longest substring to form a Palindrome
- Sorted Linked List to BST
- Palindrome Pairs
- Count occurrences of a given word in a 2-d array
- Number of distinct words with K maximum contiguous vowels
- Shortest Unique prefix for every word
- Maximum Number of Toys
- Min Chars to Add for Palindrome
- Minimum swap required to convert binary tree to binary search tree
- Chocolates Pickup
- Count Lucky Permutations
- Count the Substring
- Fixing Two swapped nodes of a BST
- Shortest Path Using Atmost One Curved Edge
- Avoid Explosion
- Walls Coloring II
- Minimum BST Sum Subtree
- Maximum good length
- Geek and Bridges
- Reverse a linked list
- Delete nodes having greater value on right
- Remove duplicates from an unsorted linked list
- Split a Linked List into two halves
- Inorder Traversal
- Reverse a Doubly Linked List
- Check for BST
- Right View of Binary Tree
- Mirror Tree
- Height of Binary Tree
- Balanced Tree Check
- Kth from End of Linked List
- Check If Circular Linked List
- Left View of Binary Tree
- Transform to Sum Tree
- Intersection Sorted Linked Lists
- 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
- BFS of graph
- Identical Trees
- Lowest Common Ancestor in a BST
- Binary Search
- Odd even level difference
- Binary Tree to BST
- Leaves at Same Level or Not
- Multiply two linked lists
- Delete in a Singly Linked List
- Kth largest element in BST
- Array Duplicates
- Special Stack
- Three way partitioning
- Inorder Successor in BST
- Convert Ternary Expression to Binary Tree
- Reverse Using Stack
- Symmetric Tree
- Median of BST
- Queue Reversal
- Reverse first K of a Queue
- Brothers From Different Roots
- Rotate doubly Linked List
- Print adjacency list
- Isomorphic Strings
- Reverse Words
- Parenthesis Checker
- Minimum Cost of ropes
- N meetings in one room
- Reach a given score
- Count ways to N'th Stair
- Count number of hops
- Union of Arrays with Duplicates
- Positive Negative Pair
- Product array puzzle
- Roman Number to Integer
- Missing And Repeating
- Sort by Set Bit Count
- Maximize sum after K negations
- Pairs with certain difference
- Common in 3 Sorted Arrays
- Move all negative elements to end
- Chocolate Distribution Problem
- Find Pair Given Difference
- Form a Triangle
- Smallest subarray with sum greater than x
- Convert a sentence into its equivalent mobile numeric keypad sequence
- Rearrange a string
- Second Largest
- Second most repeated string in a sequence
- Longest Common Prefix of Strings
- Min Number of Flips
- Two sum -Pairs with 0 Sum
- Maximum sum of increasing order elements from n arrays
- Merge two binary Max heaps
- Palindrome String
- Search array with adjacent diff at most k
- Shop in Candy Store
- Reverse Bits
- Count numbers containing 4
- Page Faults in LRU
- Check if it is possible to survive on Island
- Maximum sum difference
- BBT counter
- Arithmetic Number
- Check if it is possible to convert one string into another with given constraints
- Array to BST
- Count all possible paths from top left to bottom right
- Rearrange Geek and his Classmates
- Modified Numbers and Queries
- Print Diagonally
- Gadgets of Doraland
- Largest value in each level
- Smallest Subset with Greater Sum
- Minimum Sum of Absolute Differences of Pairs
- Smallest window containing 0, 1 and 2
- Can Make Triangle
- Matrix Operations
- Consecutive Occurrence
- Make Palindrome
- Split Employees
- Minimize the sum
- Last modified ball
- Transform to Sum Tree
- Find the first node of loop in linked list
- Is it Fibonacci
- All Numbers
- High Frequency
- Good tree
- Binary Good
- Balloon Everywhere
- Reverse both parts
- Cutting Rectangles
- Is it Fibonacci
- Binary matrix having maximum number of 1s
- Magic and toy shop
- Postorder Traversal
- Preorder Traversal
- Sum Except First and Last
- Search a node in BST
- Minimum element in BST
- Anagram of String
- Value equal to index value
- Rotate Array by One
- Array Subset
- Min and Max in Array
- Print first letter of every word in the string
- 1s Complement
- Find position of set bit
- Binary number to decimal number
- Count Squares
- Middle of Three
- Sorted matrix
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