- Reverse an Array
- Frequency of Array Elements
- Maximum and Minimum Of Array Elements
- Sum Of Digits
- Sum of Array
- Number of factors
- Armstrong Numbers
- Prime Number
- LCM And GCD
- Sum of Series
- Power of 2
- Series AP
- Sort The Array
- Binary number to decimal number
- Nth Fibonacci Number
- Sieve of Eratosthenes
- Count possible triangles
- Rotate Array by n elements
- Permutations of a given string
- Parity of unsigned integer
- Check if the number is Fibonacci
- Count increasing Subarrays
- Missing number in array
- Rock Paper Scissors!
- Array of alternate +ve and -ve no.s
- Swap two nibbles in a byte
- Maximum product of two numbers
- Remove Spaces
- Value equal to index value
- Number of paths
- Boolean Matrix Problem
- Count total set bits
- Number is sparse or not
- Bit Difference
- Count numbers containing 4
- Convert from any base to decimal
- Reverse sub array
- Count zero
- Perfect Squares in a Range
- Sum of distinct elements
- Max Sum without Adjacents
- Remove character
- Ugly Numbers
- Number of occurrence
- k largest elements
- Pairs of prime number
- Minimum difference pair
- Evaluate the x + a = b statement
- Leaders in an array
- Sum of Digits Divisibility
- Possible groups
- Ways To Tile A Floor
- Absolute distinct count
- Generate Binary Numbers
- Shortest direction
- Find the Odd Occurence
- Angle between hour and minute hand
- Sum of large numbers
- Keypad typing
- Total distance travelled in an array
- Sum of Products
- LCM of given array elements
- Extraction of secret message
- Minimum sum
- Missing ranges of numbers
- Help the Old Man!!!
- Cube root of a number
- Base Conversion
- Total count
- Surpasser Count
- Product of Complex Numbers
- How many pizzas ?
- Sum of Digits Multiple
- Matchsticks game
- Sum of primes
- Minimize string value
- The AND Gate
- Maximum Area
- The OR Gate
- Multiple in Table Tennis
- Good String
- Mega Sale
- 3 Divisors
- Set Bits
- Prime Factors
- Repeated sum of digits
- Subset Sums
- Longest Consecutive 1's
- Maximize sum after K negations
- Different ways to Spell a Number
- Sum of divisors
- Count Squares
- Square Divisors
- Nth Even Fibonacci Number
- Count Sorted Rows
- Disarium Number
- Pairs with given XOR
- Padovan Sequence
- Juggler Sequence
- No of Carry Operations
- Distance and Displacement
- Equal Point in Sorted Array
- Elements before which no element is bigger
- Sum of elements between k1'th and k2'th smallest elements
- Minimize the sum of product
- Convert floating point to natural number
- Make a Distinct Digit Array
- Coverage of all Zeros in a Binary Matrix
- Chocolate Distribution Problem
- Demonitisation
- Check if a number can be expressed as x^y
- Permutations in array
- String with numbers at its end
- Interesting Patterns
- Starting Point
- Help a Thief!!!
- At least two greater elements
- Encrypt the string - 1
- Replace the Bit
- Sum of product of x and y with floor(n/x) = y
- Drive the car
- Largest subarray with GCD one
- Squares in a Matrix
- Flying Jet
- Metro Problem
- King's War
- Check squares
- Sum of two Squares [Duplicate]
- Help Joey
- Find first and last occurrence of x
- Type of array
- Ladoo problem
- Sum of dependencies in a graph
- Stuffs Division
- Sort in specific order
- Check if two arrays are equal or not
- Sherlock a Detective
- Invert the Bits
- Check if divisible by 11
- Trace Path
- Unique Numbers
- XOR of all elements
- Check if divisible by 4
- Substrings with similar first and last characters
- Sum of all substrings of a number
- Rahul lucky-unlucky
- India's unique railway track
- Count rotations divisible by 4
- Check if divisible by 36
- Binary fraction to decimal
- Find first set bit
- Minimize sum of alternate product
- Find the safe position
- Check for subsequence
- Check if the door is open or closed
- Find first repeated character
- Find difference between sum of diagonals
- Count even substrings
- Magical Number
- Message decoding
- Geek and Coffee Shop
- A guy with a mental problem
- Fake Profile
- Check if divisible by 5
- Wrong Ball
- Magical String
- The Muskteers
- Index of first 1 in a sorted array of 0’s and 1’s
- Strong Numbers
- Sherlock and his Enemies
- Does array represent Heap
- Missing number in shuffled array
- Thief trying to escape
- Largest Fibonacci Subsequence
- Last index of One
- Arranging the array
- Tracks
- First element to occur k times
- Fill array with 1's
- Length of Last word
- Remove Duplicates from unsorted array
- Uncommon characters
- Count of smaller elements
- URLify a given string
- Multiple of X closest to N
- Split Strings
- Minimum move to front operations
- Even Odd Sum
- Sum Terms Nth Row
- Smallest power of 2 greater than or equal to n
- Pair array product sum
- Equivalent Sub-Arrays
- All numbers with specific difference
- Count pair sum
- First Come First Serve
- K-th distinct element
- Friendly Array
- Swap and Maximize
- Max Sum Subarray of size K
- Minimum Difference among K
- Sort the Half Sorted
- Partition Point in the Array
- Fibonacci in the array
- Alternative Sorting
- Rightmost different bit
- Count numbers divisible by M
- Max value after m range operation
- Check set bits
- Set kth bit
- Sorting Employees
- Count Pairs Odd Xor
- Make a Palindrome
- Bitonic Generator Sort
- Toggle bits given range
- Stable Sort and Position
- Twice counter
- Longest Common Prefix in an Array
- Elements in the Range
- In First But Second
- Adam Number
- First K natural numbers
- Sum of distinct elements for a limited range
- Minimum number of flipped bits
- Total number of Strings
- Minimum Distinct Ids
- Find the Highest number
- Twisted Prime Number
- Anagram Palindrome
- First and last occurrences of X
- Positive and negative elements
- Boolean String Value
- Equalization of an array
- Just One Mismatch
- Smallest number repeating K times
- Sum of diagonals
- Rearrange the array
- Ceil The Floor
- Sort first half in ascending and second half in descending
- Tough Competitors
- The Counting Game !!
- Remove common characters and concatenate
- Numbers having two adjacent set bits
- Repeated I.Ds
- Check if two given circles touch each other
- Binary representation of previous number
- Left Rotate Matrix K times
- Rectangle Number
- Sum of Digit Modified
- Count the characters
- Find k-th character in string
- Good or Bad string
- Repeated Character
- Numbers having alternate bits
- Red OR Green
- Sort String
- Find unique element
- Make a string from another string
- Generate all cyclic permutations of a number
- Find the fine
- Rearrange string as alternate x and y occurences
- Minimum rotations to unlock a circular lock
- Maximize ∑arr[i]*i of an Array
- Set the rightmost unset bit
- Weak Maths
- Stuti and her Problem
- Find the closest number
- Narcissistic number
- Full Prime
- Finding-Pairs
- Last index of a character in the string
- Print Linked List elements
- Count nodes of linked list
- Node at a given index in linked list
- Delete node in Doubly Linked List
- Size of Binary Tree
- Inorder Traversal
- Count Leaves in Binary Tree
- Merge Sort
- Quick Sort
- Mirror Tree
- Two Mirror Trees
- Height of Binary Tree
- Heap Sort
- Finding middle element in a linked list
- Circular Linked List
- Sum Tree
- Postorder Traversal
- Implement Stack using Linked List
- Implement stack using array
- Implement Queue using Linked List
- Implement Queue using array
- Square root
- Print all nodes that don’t have sibling
- Insert a node in Doubly linked list
- Run Length Encoding
- Remove duplicate elements from sorted Array
- Replace all 0's with 5
- Count zeros in a sorted matrix
- Equilibrium index of an array
- Largest product
- Convert to Roman No
- Preorder Traversal
- Implement strstr
- C++ STL | Set 1 (vector)
- C++ STL | Set 3 (map)
- C++ STL | Set 4 (stack)
- C++ STL | Set 5 (queue)
- C++ STL | Set 6 (set)
- Search a node in BST
- Equal Sum and XOR
- C++ STL | Set 7 (unordered map)
- C++ STL | Set 8 (unordered set)
- Smallest divisible number
- Remainder with 7
- Implement Atoi
- Repetition of k length substring
- Find Number of Numbers
- Minimum distance between two numbers
- Multiply Matrices
- Count distinct elements in every window
- Find triplets with zero sum
- Level order traversal
- Operating an array
- Linked List Insertion
- Operating a sorted array
- Insert in a Sorted List
- Play with an array
- Ancestors in Binary Tree
- Root to Leaf Paths
- Anagram of String
- Circular Linked List Traversal
- Linked List Length Even or Odd?
- Delete Alternate Nodes
- Identical Linked Lists
- Merge Lists Alternatingly
- Find the Sum of Last N nodes of the Linked List
- Modular Node
- Find n/k th node in Linked list
- Queue Reversal
- Triplet Family
- Sum of Binary Tree
- Sum of Leaf Nodes
- Insert in Middle of Linked List
- Pairwise Consecutive Elements

Name

Michael Riegger

Institution

Relic Entertainment

Other Profile Link

Coding Score

2154

Problems Solved

970

Overall Rank: 3

Monthly Rank: 85

Weekly Rank: 229

- Print Pattern
- Rotation
- Search in a Rotated Array
- Parenthesis Checker
- Squares in N*N Chessboard
- Merge Two Sorted Arrays
- Magic Number
- Maximize Toys
- Non Repeating Character
- Repetitive Addition Of Digits
- Good Pairs
- Reverse words in a given string
- Pythagorean Triplet
- Count Substrings
- Move all zeroes to end of array
- Sum of Digit is Pallindrome or not
- Remove “b” and “ac” from a given string
- Strong Number
- Majority Element
- Equal Sum and Product
- Sort an array of 0s, 1s and 2s
- Subset Sum Problem
- Finding Number
- Stock buy and sell
- Maximum value in a bitonic array
- Next greater number set digits
- Finding Position
- Amount of Water
- Single Number
- Does robot moves circular
- Element that appears once where every element occurs twice
- Is Square
- N meetings in one room
- Maximum of all subarrays of size k
- Addition of submatrix
- Maximum sum increasing subsequence
- Array to BST
- Facing the sun
- Triangular Number
- Greater on right side
- Convert array into Zig-Zag fashion
- Key Pair
- Maximum Difference
- Multiply two polynomals
- Reverse Bits
- Count Smaller elements
- Reach the Nth point
- Subarray with given sum
- Count numbers
- Swap all odd and even bits
- Count number of hops
- Count pairs with given sum
- Save Knights
- Reach a given score
- Minimum element in a sorted and rotated array
- Search in a matrix
- Max sum submatrix
- Chinky and diamonds
- Shop in Candy Store
- Count the Zeros
- 0 - 1 Knapsack Problem
- Trail of ones
- Find the number of sub-arrays having even sum
- Number of ways to find two numbers
- Game of Death in a circle
- Examination Papers
- Next larger element
- Class Average
- Gifts! Gifts! Gifts!
- Minimum Notes Required
- Ball coloring
- Left out candies
- Sachin's love for runs
- Change Bits
- Largest number with given sum
- Collection of pens
- The Nth Fibonnaci
- Permutation with Spaces
- Element appearing once
- Equilibrium point
- Floor in a Sorted Array
- Buildings receiving sunlight
- Finding Profession
- Kth boom number
- Max value
- Flip Bits
- Faulty Keyboard
- Finding the numbers
- Sort by Set Bit Count
- Minimum Energy
- Least Prime Factor
- Left or Right Positioned Array
- Collecting Trees
- Number Game
- Happy Number
- Game of cells
- Time Difference
- Keith Number
- Pairs with specific difference
- Circle and Lattice Points
- Count Pairs in an Array
- Find (a^b)%m
- Sphenic Number
- Min sum formed by digits
- Move all negative elements to end
- String Manipulation
- Help Nobita
- Maximum 0’s between two immediate 1’s
- Binary Tree K level sum
- Exit Point in a Matrix
- Reverse each word in a given string
- Maximum Sum Bitonic Subsequence
- 1[0]1 Pattern Count
- Knapsack with Duplicate Items
- Special Factorial Number
- Make Zeroes
- Let's Play!!!
- Sum of k smallest elements in BST
- A Game of 2
- Find sum of divisors
- Smallest factorial number
- Last non-zero digit in factorial
- Reverse Coding
- Flood fill Algorithm
- Save The Nation
- Pair with greatest product in array
- Encrypt the string - 2
- Kth Prime factor of a Number
- Decode the pattern
- Longest K unique characters substring
- Roman Number to Integer
- Largest Product Pallindrome
- Maximum no of 1's row
- Friends Pairing Problem
- Decode the string
- Max sum in sub-arrays
- Gold Mine Problem
- Smallest subarray with sum greater than x
- Odd Game
- Rahul a Geek
- Sharing
- Seeds of a number
- Game of XOR
- Find largest word in dictionary
- Learn Geometry
- Long Long Decimal
- Love For The Twins
- Find the nth number in the sequence
- Recaman’s sequence
- Minimum Operations
- Equal point in a string of brackets
- Shortest distance in infinite tree
- Largest zigzag sequence
- Meta Strings
- Siri and her new College
- Numbers with same first and last digit
- Check if palindromic ignoring spaces
- Rahul and his Villa
- Temple Offerings
- Sid and his prime money
- Jon and string
- Race in Fooland
- Excel Sheet | Part - 2
- Find the element that appears once in sorted array
- Zero Sum Subarrays
- Smallest window in a string containing all the characters of another string
- Playing with mobile numbers
- Find the string in grid
- Counting number of sentences and words in text
- Increasing Sub Sequence
- Longest Palindromic Subsequence
- K-th element of two sorted Arrays
- Evaluation of Postfix Expression
- Maximum difference Indexes
- Recursive sequence
- Rod Cutting
- Decreasing Sequence
- Check whether K-th bit is set or not
- Efficiently sorting numbers in range from 0 to n^2 - 1
- Element with left side smaller and right side greater
- Element in a Series
- Array Subset of another array
- Karatsuba Algorithm
- Smallest Positive missing number
- Longest Bitonic subsequence
- Count the paths
- First negative integer in every window of size k
- Unique substrings
- Merge two binary Max heaps
- Extract Maximum
- Sum of product of all pairs
- Game with String
- Sum of numbers in string
- Paths to reach origin
- Print first letter of every word in the string
- Get Minimum Squares
- Number of divisors in a given range
- Sum equals to Sum
- Find Pair Given Difference
- Sorted matrix
- Carry counter
- Second most repeated string in a sequence
- Reverse vowels in a given string
- Count all possible paths from top left to bottom right
- Minimum Deletions
- Sort the given array after applying the given equation
- k sorted array
- Assign Mice Holes
- Mr Modulo and Pairs
- Rearrange a string
- Minimum Number in a sorted rotated array
- Euler Totient Function
- Divisibility by 999
- Rotten Oranges
- Number of Groups
- Minimum Toogles to partition
- Fibonacci Expression
- Minimum number of deletions and insertions.
- Replace a word
- Count of strings that can be formed using a, b and c under given constraints
- Maximum sum Problem
- Minimum indexed character
- Find number of times a string occurs as a subsequence
- Printing Maximum Sum Increasing Subsequence
- Consecutive Array Elements
- Stickler Thief
- Lucky Numbers
- Even and odd elements at even and odd positions
- Geek and its Colored Strings
- Check perfect square
- Merging two unsorted arrays in sorted order
- GCD, LCM and Distributive Property
- Even Fibonacci Numbers Sum
- Power Of 2 and Subsequences
- Sum of Lengths of Non-Overlapping SubArrays
- Print Matrix in snake Pattern
- Maximum possible sum
- Check a Integer is power of 3 or not
- Change all even bits in a number to 0
- Carol Number
- Mersenne Prime
- Generate all palindromic numbers less than n
- Kth LSB
- Chocolate Station
- Common Subsequence
- K-Ary Tree
- Boundary Elements of Matrix
- Maximum sum difference
- Sub-arrays with equal number of occurences
- Min Manipulations to make Strings Anagram
- Three consecutive duplicates
- Completing tasks
- Base Equivalence
- XOR Count Zero and One
- Flipping bits No and Binary Format in Reverse Order
- Required Rooms
- Find the minimum time
- Make the hit in power game !
- Maximum Height Tree
- Prime number of set bits
- First and last Bit
- Minimum product pair
- Divisible by 7
- Reversing the equation
- Array's Game
- Convertible string
- Smallest K digit number divisible by X
- Numbers containing 1, 2 and 3
- Mean of range in array
- Pairs with Difference less than K
- Find k-th missing element
- One's Complement
- Woodall Number
- Incomplete Array
- Sum Indexes
- GeeksForGeeks New System
- Maximum number of characters between any two same character
- Frequency of each element in an unsorted array
- Winner of an election
- Close to Perfection
- Last seen array element
- Find the maximum number of handshakes
- Nth character in Concatenated Decimal String
- Number of pairs with maximum sum
- Roof Top
- Pairs which are Divisible by 4
- Trisha's Number
- Count unset bits in a given Range
- Reverse a linked list
- Occurence of an integer in a Linked List
- Delete N nodes after M nodes of a linked list
- Add two numbers represented by linked lists
- Rearrange a linked list
- linked list of strings forms a palindrome
- Detect Loop in linked list
- Right View of Binary Tree
- K distance from root
- Delete without head pointer
- Diameter of Binary Tree
- Check for Balanced Tree
- n'th node from end of linked list
- Left View of Binary Tree
- Delete Middle of Linked List
- Merge two sorted linked lists
- Transform to Sum Tree
- Intersection of two sorted Linked lists
- Queue using two Stacks
- Level order traversal in spiral form
- Reverse Level Order Traversal
- Depth First Traversal for a Graph
- Insert a node in a BST
- BFS traversal of graph
- Determine if Two Trees are Identical
- Root to leaf path sum
- Lowest Common Ancestor in a BST
- Implement two stacks in an array
- Largest subarray of 0's and 1's
- Level order traversal Line by Line
- Largest subarray with 0 sum
- Print a Binary Tree in Vertical Order
- Odd even level difference
- Binary Tree to BST
- Max sum in the configuration
- Get minimum element from stack
- Unique rows in boolean matrix
- Remove every k'th node
- Is Binary Tree Heap
- Validate an IP Address
- Distinct occurrences
- C++ STL | Set 2 (pair)
- Sum of subset differences
- Josephus problem
- You and your books
- Expression Tree
- Maximum Difference
- Check if Linked List is Palindrome
- Max distance between same elements
- Print matrix in diagonal pattern
- Find perimeter of shapes
- Generate Grey Code Sequences
- Check whether BST contains Dead End
- Delete a Node in Single Linked List
- Kth largest element in BST
- Minimum four sum subsequence
- Check if two strings are k-anagrams or not
- Max Level Sum in Binary Tree
- Special Stack
- Root to leaf paths sum
- Three way partitioning
- Print Nodes having K leaves
- Sort a stack
- String Modification
- Longest consecutive sequence in Binary tree
- Print Common Nodes in BST
- Peak element
- Delete nodes greater than k
- Index Of an Extra Element
- Sum of given range
- Union of Two Linked Lists
- Sum of leaf nodes in BST
- Counting Sort
- Max and min element in Binary Tree
- Counting elements in two arrays
- Full binary tree
- Triplet with 0 sum in BST
- Symmetric Tree
- Vertical sum
- Check if Tree is Isomorphic
- Depth of node
- Leaves to DLL
- Maximum Node Level
- Children Sum Parent
- Diagonal Sum In Binary Tree
- Find length of Loop
- Deletion and Reverse in Linked List
- Normal BST to Balanced BST
- Linked List Matrix
- Reverse First K elements of Queue
- Remove Half Nodes
- Sum of Right Leaf Nodes
- Sum of Left Leaf Nodes
- Brothers From Different Roots
- Sum of the Longest Bloodline of a Tree
- Exchange the Leaf Nodes
- Kth Ancestor in a Tree

- Coin Change
- Kadane's Algorithm
- Number of Unique Paths
- Print Diagonally
- Wave Array
- Overlapping Intervals
- Binary String
- Next Permutation
- Longest Increasing Subsequence
- Longest Common Subsequence
- Minimum number of jumps
- Count ways to reach the n’th stair
- Count ways to N'th Stair(Order does not matter)
- Egg Dropping Puzzle
- Edit Distance
- nCr
- Maximum Rectangular Area in a Histogram
- Consecutive 1's not allowed
- Count of Subarrays
- Longest Even Length Substring
- Path in Matrix
- Trapping Rain Water
- String formation from substring
- Case-specific Sorting of Strings
- Rank of Matrix
- Sum of bit differences
- Number following a pattern
- Longest Palindrome in a String
- Modular Exponentiation for large numbers
- Relative Sorting
- Black and White
- Remove minimum elements
- Largest square formed in a matrix
- Design a tiny URL or URL shortener
- Rotate a 2D array without using extra space
- Number of ways
- Minimum Cost of ropes
- Sum of Query II
- Form a palindrome
- Preorder to Postorder
- Longest consecutive subsequence
- Convert an array to reduced form
- Minimum steps to get desired array
- Handshakes
- Tic-Tac-Toe
- Number to words
- Betting game
- Unique partitions
- Triplet Sum in Array
- Palindromic Strings
- Max possible amount
- Cost of Sweets
- Smallest Sub-Array
- Satisfy the equation
- Maximum Profit
- Build the smallest
- Your Social Network
- Special Matrix
- Lots of Work
- Total Decoding Messages
- Unique BST's
- Distinct Transformations
- Subsets
- Combination Sum
- Combination Sum - Part 2
- Word Break
- K’th smallest element
- Divisible by 8
- Sum of Subarrays
- Maximum calorie
- Prime Factors and their Powers
- Longest Common Substring
- Easy Query
- Count Palindrome Sub-Strings of a String
- Find patterns
- Largest Divisibility Test
- Check if a string is repetition of its substring of k-length
- Rotate and delete
- Negative weight cycle[test cases to be corrected]
- Hamiltonian Path
- Count the Number of Full Binary Trees
- Shortest Source to Destination Path
- Number of Palindromic paths in a Matrix
- Trie | (Insert and Search)
- Replace O's with X's
- Partition a number into two divisible parts
- Knight Walk
- Substring - Subsequence problem
- Count of AP Subsequences
- Word Boggle
- Form coils in a matrix
- Max absolute difference
- Print leaf nodes from preorder traversal of BST
- Reverse Delete Algorithm for Minimum Spanning Tree
- Distance of nearest cell having 1
- Is Sudoku Valid
- Find whether path exist
- Check Mirror in N-ary tree
- Length of largest region of 1's
- Rearrange characters
- Express as sum of power of natural numbers
- First non-repeating character in a stream
- Count subsequences of type a^i b^j c^k
- Stepping Numbers
- Count in array
- Kth largest element in a stream
- Magnet Array Problem
- Smallest distinct window
- James Bond and Divisors
- Minimum number of steps to reach a given number.
- Floyd Warshall
- Nearly Sorted Algorithm
- Smallest Absolute Difference
- Reverse Spiral Form of Matrix
- Pyramid form
- Maximum sum Rectangle
- Maximum Intervals Overlap
- Minimum Time
- Perfect Sum Problem
- Longest Path in a matrix
- Job Sequencing Problem
- Page Faults in LRU
- Count possible ways to construct buildings
- Image Multiplication
- Two water Jug problem
- Median In a Row-Wise sorted Matrix
- Smith Number
- Numbers with alternative 1's
- Coins and Game
- Pairs of Non Coinciding Points
- Special Numbers
- Alternate Vowel and Consonant String
- Find the element at given index
- Print N-bit binary numbers having more 1’s than 0’s
- Next higher palindromic number using the same set of digits
- Find the last digit when factorial of A divides factorial of B
- Biconnected Graph
- Pizza Mania
- Killing Spree
- Given a linked list, reverse alternate nodes and append at the end
- Reverse a Linked List in groups of given size.
- Delete nodes having greater value on right
- Count BST nodes that lie in a given range
- Check for BST
- Bottom View of Binary Tree
- Intersection Point in Y Shapped Linked Lists
- Add all greater values to every node in a BST
- Construct Binary Tree from Parent Array
- Connect Nodes at Same Level
- Clone a linked list with next and random pointer
- Flattening a Linked List
- Diagonal Traversal of Binary Tree
- Delete a node from BST
- Detect cycle in a directed graph
- Min distance between two given nodes of a Binary Tree
- Maximum difference between node and its ancestor
- Range Minimum Query
- Topological sort
- Find the number of islands
- Check if subtree
- Clone a Binary Tree
- Remove loop in Linked List
- Implementing Dijkstra | Set 1 (Adjacency Matrix)
- Max length chain
- Largest BST
- Interleaved Strings
- Sum of permutations
- Box Stacking
- Count Palindromic Subsequences
- Multiply two strings
- Minimum Swaps
- Longest Consecutive Subsequence
- Rat in a Maze Problem
- Bipartite Graph
- Max sum subarray by removing at most one element
- Number of root to leaf paths
- Find the Closest Element in BST
- Pots of Gold Game
- Delete keys in a Linked list
- Merge two BST 's
- Merge k Sorted Arrays
- Length of longest palindrome in linked list
- Duplicate subtree in Binary Tree
- Find the missing no in string
- Smallest range in K lists
- k-th smallest element in BST
- Complete Binary Tree
- Foldable Binary Tree
- Leftmost and rightmost nodes of binary tree
- Construct tree from Inorder and LevelOrder
- Node at distance
- Mirror of a given node
- Maximum path sum from any node
- Largest Independent Set Problem
- Number of Turns in Binary Tree
- Duplicate Subtrees
- Construct Tree from Preorder Traversal

- Minimum Points To Reach Destination
- Maximum Index
- Minimum sum partition
- Maximum of minimum for every window size
- Head to Tail ordering
- Find Prime numbers in a range
- Largest Number formed from an Array
- Find sum of different corresponding bits for all pairs
- Return two prime numbers
- Allocate minimum number of pages
- Sorting Elements of an Array by Frequency
- Path of greater than equal to k length
- Rohan's Love for Matrix
- Create your own Calculator
- X Total Shapes
- Boolean Parenthesization
- Longest valid Parentheses
- Word Break - Part 2
- N-Queen Problem
- Solve the Sudoku
- Strongly connected component (Tarjans's Algo)
- Find median in a stream
- Distinct palindromic substrings
- QuickSort on Doubly Linked List
- Reorder List
- Binary Tree to DLL
- Tree from Postorder and Inorder
- LRU Cache
- AVL Tree Insertion
- Alien Dictionary
- Fixing Two nodes of a BST