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rishabh007
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C++, Java, C
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892 points
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892 points
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SCHOOL (1)
BASIC (31)
EASY (90)
MEDIUM (109)
HARD (20)
- Sort a linked list of 0s, 1s and 2s
- Bottom View of Binary Tree
- Intersection in Y Shaped Lists
- Diameter of a Binary Tree
- Merge two sorted linked lists
- Add all greater values to every node in a BST
- Connect Nodes of Levels
- Diagonal Tree Traversal
- Tree Boundary Traversal
- Delete a node from BST
- Directed Graph Cycle
- Maximum difference between node and its ancestor
- Absolute List Sorting
- Two Stacks in an Array
- Max sum path in two arrays
- The Celebrity Problem
- Largest subarray with 0 sum
- Topological sort
- Vertical Tree Traversal
- Find the number of islands
- Max sum in the configuration
- Serialize and deserialize a binary tree
- Linked List to Binary Tree
- Extreme nodes in alternate order
- Clone a Binary Tree
- Remove loop in Linked List
- Dijkstra Algorithm
- Largest BST
- Interleaved Strings
- Minimum Swaps to Sort
- Bipartite Graph
- Delete keys in a Linked list
- Count distinct elements in every window
- Sort a stack
- k-th Smallest in BST
- Merge Sort for Linked List
- Union of Two Linked Lists
- Root to Leaf Paths
- Occurences of 2 as a digit
- Vertical sum
- Leaves to DLL
- Construct Tree from Preorder Traversal
- Swap Kth nodes from ends
- Smallest Positive Missing
- Kadane's Algorithm
- Unique BST's
- Indexes of Subarray Sum
- Triplet Sum in Array
- Spirally traversing a matrix
- Unit Area of largest region of 1's
- Longest Consecutive Subsequence
- Stock span problem
- Next Greater Element
- K Sized Subarray Maximum
- Fractional Knapsack
- Minimum Platforms
- Largest number in K swaps
- Stickler Thief
- Egg Dropping Puzzle
- Longest Increasing Subsequence
- X Total Shapes
- Find whether path exist
- Rotten Oranges
- Count subsequences of type a^i, b^j, c^k
- Sort 0s, 1s and 2s
- Sum of Middle elements of two sorted arrays
- Pythagorean Triplet
- Max absolute difference
- Form the Largest Number
- Column name from a given column number
- Nuts and Bolts Problem
- Rotate a Matrix
- Factorials of large numbers
- Reverse each word in a given string
- Length of the longest substring
- k largest elements
- Longest Palindrome in a String
- Look and Say Pattern
- Tic Tac Toe
- Maximize the sum of selected numbers from a sorted array to make it empty
- Longest Palindromic Subsequence
- Roll the characters of a String
- Transform to prime
- Permutations of a String
- Number following a pattern
- Friends Pairing Problem
- Game of XOR
- Max Sum Increasing Subsequence
- Coin Change (Count Ways)
- Gold Mine Problem
- Count ways to N'th Stair(Order does not matter)
- Knapsack with Duplicate Items
- Maximum path sum in matrix
- Array Pair Sum Divisibility Problem
- Number of paths
- How Many X's?
- Exit Point in a Matrix
- Is Sudoku Valid
- Total Decoding Messages
- Stream First Non-repeating
- Segregate even and odd nodes in a Linked List
- Largest square formed in a matrix
- Kth Largest in a Stream
- Find the string in grid
- Number of Palindromic paths in a Matrix
- Count the paths
- Shortest Source to Destination Path
- Maximum sum Rectangle
- Recursively Remove Adjacent Duplicates
- Reverse a Doubly Linked List
- Check for BST
- Right View of Binary Tree
- K distance from root
- Mirror Tree
- Two Mirror Trees
- Delete without head pointer
- Height of Binary Tree
- Kth from End of Linked List
- Middle of a Linked List
- Left View of Binary Tree
- Transform to Sum Tree
- Find Transition Point
- Queue using two Stacks
- Remove Duplicates from a Sorted Linked List
- Reverse Level Order Traversal
- DFS of Graph
- Stack using Linked List
- Identical Trees
- Root to leaf path sum
- Square Root
- Lowest Common Ancestor in a BST
- Odd even level difference
- Binary Tree to BST
- Equilibrium index of an array
- Expression Tree
- Longest Consecutive Subsequence
- Kth largest element in BST
- Multiply two polynomials II
- Max Level Sum in Binary Tree
- Special Stack
- Index of an Extra Element
- Disjoint set (Union-Find)
- Full Binary Tree
- Count Pairs whose sum is equal to X
- Product of an Array
- Min Heap implementation
- Power of 2
- Wave Array
- Frequencies in a Limited Array
- Equilibrium Point
- Array Leaders
- Rotate by 90 degree
- String Rotated by 2 Places
- Strings Rotations of Each Other
- Reverse Words
- Parenthesis Checker
- Generate Binary Numbers
- Minimum Cost of ropes
- N meetings in one room
- Count ways to N'th Stair
- Count number of hops
- Reach a given score
- Missing in Array
- Product array puzzle
- Roman Number to Integer
- Missing And Repeating
- Find the closest number
- Next greater number set digits
- Move All Zeroes to End
- Bitonic Point
- Single Number
- 1[0]1 Pattern Count
- Addition of submatrix
- Sort in specific order
- Facing the sun
- Greater on right side
- Count Substrings
- Twice Counter
- Convert array into Zig-Zag fashion
- Check if array contains contiguous integers
- Number of occurrence
- Longest Common Prefix of Strings
- Sum of Lengths of Non-Overlapping SubArrays
- Number of 1 Bits
- Find the Highest number
- Reverse Bits
- Nth Fibonacci Number
- Swap two nibbles in a byte
- Copy Set Bits in Range
- Element that appears once where every element occurs twice
- Shortest path from 1 to n
- Final Destination
- Print this pattern!
- Sum of all prime numbers between 1 and n
- Total number of Strings
- Number of 1's in smallest repunits
- Rotate a Matrix by 180 Counterclockwise
- Prime number of set bits
- Binary Tree K level sum
- Linked List Group Reverse
- Reorder List
- Binary Tree to DLL
- Clone List with Next and Random
- Min distance between two given nodes of a Binary Tree
- Max rectangle
- LRU Cache
- Nodes at given distance in binary tree
- Max Path Sum 2 Special Nodes
- Trapping Rain Water
- Smallest window containing all characters of another string
- Histogram Max Rectangular Area
- Max of min for every window size
- Find median in a stream
- Minimum Cost Path
- Minimum sum partition
- Matrix Chain Multiplication
- Convex Hull
- Travelling Salesman Problem
- Huffman Encoding
- Rotate Array
- Count Leaves in Binary Tree
- Queue using Linked List
- Replace all 0's with 5
- Replace all 0's with 5
- First Occurence
- Palindromic Array
- Peak element
- Alternates in an Array
- Bit Difference
- Reverse array in groups
- Array Search
- Keypad typing
- Maximum product of two numbers
- Immediate Smaller Element
- String Reversal
- Exceptionally odd
- Array Subset
- Remove character
- Betting game
- Check set bits
- Find the fine
- House Robber
- Repeated IDs
- Absolute Difference of 1
- Unique Numbers
- Half N by M
- Pattern Jumping
- Minimum difference pair
- Finding Position
- Sorted matrix
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