- Reverse an Array
- Frequency of Array Elements
- Maximum and Minimum Of Array Elements
- Sum Of Digits
- Maximum Occuring Character
- Factorial
- Sum of Array
- Number of factors
- Leap Year
- Palindrome String
- Armstrong Numbers
- Prime Number
- LCM And GCD
- Multiply 2 matrices
- Sum of Series
- Searching a number
- Power of 2
- Series AP
- Series GP
- Sort The Array
- Binary number to decimal number
- Nth Fibonacci Number
- Sort a String
- Automorphic Number
- Weird Number
- Print the Kth Digit
- Sieve of Eratosthenes
- Shortest path from 1 to n
- Count possible triangles
- Dice throw
- Rotate Array by n elements
- Fascinating Number
- Permutations of a given string
- Parity of unsigned integer
- Check if the number is Fibonacci
- Count increasing Subarrays
- Rearrange Array Alternately
- 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
- Numbers containing 0's from 1 to N
- Count total set bits
- Number is sparse or not
- Bit Difference
- Count numbers containing 4
- Convert from any base to decimal
- Decimal to any base conversion
- Reverse sub array
- Odd Divisors
- Count zero
- Perfect Squares in a Range
- nth digit of Fibonacci
- Sum of distinct elements
- Max Sum without Adjacents
- Swap kth elements
- Intersection of two arrays
- Union of two arrays
- Remove character
- Ugly Numbers
- Perfect Cubes in a Range
- Number of occurrence
- Point lies or not
- k largest elements
- Pairs of prime number
- Minimum difference pair
- Remove recurring digits
- Evaluate the x + a = b statement
- Leaders in an array
- Find position of set bit
- Jumping Geek
- Sum of Digits Divisibility
- Possible groups
- Palindromic Subsequences
- Ways To Tile A Floor
- Absolute distinct count
- Generate Binary Numbers
- Shortest direction
- Smallest number
- Factorial Number
- Count the numbers
- Find the Odd Occurence
- Find the remainder
- Angle between hour and minute hand
- Sum of large numbers
- Keypad typing
- Euler Totient Sum and Divisors
- Generate binary string
- Total distance travelled in an array
- Divide the number
- Sum of Products
- LCM of given array elements
- Extraction of secret message
- Minimum sum
- Even occurring elements
- Missing ranges of numbers
- Help the Old Man!!!
- Punish the Students
- Who Will Win?
- 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
- Multiples Power
- Minimize string value
- Rotate by 90 degree
- Rearranging array
- The AND Gate
- Maximum Area
- The OR Gate
- Multiple in Table Tennis
- 1's Complement
- Missing number in matrix
- 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
- Form a Triangle
- Drive the car
- Largest subarray with GCD one
- Squares in a Matrix
- Flying Jet
- Metro Problem
- King's War
- Check squares
- 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
- Lucky Number-2
- Unique Numbers
- XOR of all elements
- Check if divisible by 4
- Learning Output
- 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
- Geeky Year
- Thief trying to escape
- Largest Fibonacci Subsequence
- Another Matrix Game
- Last index of One
- Arranging the array
- Common elements
- Tracks
- First element to occur k times
- Fill array with 1's
- Length of Last word
- Remove Duplicates from unsorted array
- Uncommon characters
- Minimum sum of two elements from two arrays
- Count of smaller elements
- Four Elements
- URLify a given string
- Multiple of X closest to N
- Reverse a string with spaces intact
- Faulty wiring and Bulbs
- Rotate Bits
- Split Strings
- Find Smallest Missing in Sorted
- Count the elements
- Minimum move to front operations
- Even Odd Sum
- Sum Terms Nth Row
- Smallest power of 2 greater than or equal to n
- Balance with respect to an array
- Gray to Binary and Binary to Gray
- Pair array product sum
- Pair cube count
- Equivalent Sub-Arrays
- Evaluate the expression
- All numbers with specific difference
- Count pair sum
- First Come First Serve
- K-th distinct element
- Friendly Array
- Max Odd Sum
- Largest Permutation
- Swap and Maximize
- Max Sum Subarray of size K
- Minimum Difference among K
- Longest Equal Prefix
- Check Arithmetic Progression
- Line passing through 2 points
- 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
- Break Numbers[Duplicate problem]
- Toppers Of Class
- Maximum product
- Make a Palindrome
- Quick Left Rotation
- Bitonic Generator Sort
- Difficulty of sentence
- Toggle bits given range
- Stable Sort and Position
- Twice counter
- Shuffle integers
- Longest Common Prefix in an Array
- Elements in the Range
- Remaining String
- In First But Second
- Primitive Typing
- Distinct Adjacent Element
- Adam Number
- Min value of x
- First K natural numbers
- Sum of distinct elements for a limited range
- Count triplets with sum smaller than X
- Maximum number of zeroes
- Odd to Even
- Minimum number of flipped bits
- Total number of Strings
- Minimum Distinct Ids
- Pell Number
- Find the Highest number
- Minimum sum of factors
- Twisted Prime Number
- Lucky number and a sum
- Anagram Palindrome
- Closest Number
- Transform to prime
- First and last occurrences of X
- Positive and negative elements
- Boolean String Value
- Equalization of an array
- Empty The Tank
- Just One Mismatch
- Finger Game
- Smallest number repeating K times
- Find the position of M-th item
- String Subsequence Game
- Sum of diagonals
- Rearrange the array
- Extract the integers
- Part Sort
- Ceil The Floor
- Sort first half in ascending and second half in descending
- Sum of two large numbers
- Maximum number of unique prime factors
- 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
- 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
- Java Collection | Set 4 (TreeMap)
- Implement Atoi
- Java Collection | Set 5 (LinkedHash Set)
- 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
- Sum of Binary Tree
- Sum of Leaf Nodes
- Insert in Middle of Linked List

Name

Andrey Khayrutdinov

Institution

Coding Score

3428

Subjective Score

0

Problems Solved

1460

Total Submissions

1767

Overall Rank: 1

Monthly Rank: 135

Weekly Rank: 28

- Anagram
- Adding One
- Pascal Triangle
- Maximum Gap
- Pattern Searching
- Print Pattern
- Rotation
- Search in a Rotated Array
- Parenthesis Checker
- Rectangles in N*N Board
- Squares in N*N Chessboard
- Palindrome numbers
- Subarray with least average
- Merge Two Sorted Arrays
- Magic Number
- Maximize Toys
- Consecutive elements
- Large Factorial
- Trailing zeroes in factorial
- Maximize Number of 1's
- Non Repeating Character
- a^b(Set 2)
- Minimum number of Coins
- GCD of Array
- Count Odd Factors
- Repetitive Addition Of Digits
- Distinct Substrings
- Sum of Middle Elements of two sorted arrays
- 2's Complement
- Good Pairs
- First Repeating Element
- Count Occurences of Anagrams
- Forming Rectangle
- Reverse words in a given string
- Pythagorean Triplet
- Isomorphic Strings
- Count Substrings
- Check if a given string is a rotation of a palindrome
- Move all zeroes to end of array
- Remove all duplicates from a given string
- Sum of Digit is Pallindrome or not
- Activity Selection
- Remove “b” and “ac” from a given string
- Strong Number
- Doubling the value
- Majority Element
- Equal Sum and Product
- Spirally traversing a matrix
- Sort an array of 0s, 1s and 2s
- Pairs with difference k
- Amend The Sentence
- Subset Sum Problem
- Two numbers with sum closest to zero
- Number of Coins
- Finding Number
- Stock buy and sell
- Maximum value in a bitonic array
- Number of paths in a matrix with k coins
- Next greater number set digits
- Possible words from Phone digits
- Finding Position
- Jumping Numbers
- Next sparse binary number
- Amount of Water
- Single Number
- Segregate even and odd nodes in a Linked List
- Does robot moves circular
- Element that appears once where every element occurs twice
- Longest Distinct characters in string
- Count distinct pairs with difference k
- Replace by X
- Is Square
- Column name from a given column number
- Maximum Product Subarray
- Let's Go Shopping!
- N meetings in one room
- Maximum of all subarrays of size k
- Remove Duplicates
- Row with max 1s
- Kth distance
- Frobenius coin problem
- Addition of submatrix
- Segregate Even and Odd numbers
- Maximum sum increasing subsequence
- Array to BST
- Sum of two numbers represented as arrays
- Facing the sun
- Triangular Number
- Greater on right side
- Common elements in three arrays(error)
- Convert array into Zig-Zag fashion
- Arrange Balls
- Make Number Odd
- Key Pair
- Inversion of array
- Maximum Difference
- Add Binary Strings
- Product array puzzle
- Length Unsorted Subarray
- Multiply two polynomals
- Reverse Bits
- Count Smaller elements
- Lucky Number
- Swap bits
- Reach the Nth point
- Subarray with given sum
- Adjacents are not allowed
- Maximum repeating number
- Count numbers
- Stock span problem
- Pair in array whose sum is closest to X
- Swap all odd and even bits
- Overlapping Substrings
- Max rope cutting
- Count number of hops
- Type of input
- Fun With Expresions
- Increment
- Count pairs with given sum
- Inorder Traversal and BST
- Save Knights
- Cycle Race
- Number of Days
- Special Number
- Where Am I ?
- Mapped String
- Cutting Rectangles
- AND operation
- Filling Bucket
- Minimum Value Assigned
- Copy Set Bits in Range
- Comment Removal
- Poisioned Sweet
- Two Repeated Elements
- Three Great Candidates
- K closest elements
- Dearrangement of balls
- Reach a given score
- Next in Series
- Rectangles in a Circle
- Squares in Reactangle
- Sum of GCDs
- Moving on grid
- Possible paths
- Number of pairs
- Minimum element in a sorted and rotated array
- Search in a matrix
- Value of polynomial
- Maximum Collatz sequence length
- Faithful Numbers
- Max sum submatrix
- Fibonacci Sum
- Cross character
- Day of the week
- Largest power of prime
- Number of 1's in smallest repunits
- Chinky and diamonds
- Fraction Game
- Number of subsets and mean
- Shop in Candy Store
- K-Pangrams
- Check If two Line segments Intersect
- Largest number possible
- Sub-Array Pairs
- Arrange the Balls
- Pick values
- Missing element of AP
- Count the Zeros
- Factorial Pairs
- Distinct absolute array elements
- 0 - 1 Knapsack Problem
- Good Numbers
- Longest Common Increasing Subsequence
- Maximum Number of 1s
- Pangram Checking
- Maximum XOR subset
- Integral Points In Triangle
- Pangram Strings
- Count number of disjoint subsets
- Trail of ones
- The Prime Twins
- Find the number of sub-arrays having even sum
- Skip the work
- Pallindrome Patterns
- Valid Substring
- Count the Reversals
- Diamond and Bags
- Tom and Jerry
- Left Most Digit of a product
- Right most non zero digit
- Last Match
- Greater power
- Special array reversal
- Next Prime Palindrome
- Maximum value K
- Extract the Number from the String
- Digit multiplier
- Number of ways to find two numbers
- Interesting Prime Numbers
- Cutted Segments
- Lexicographically previous permutation
- Smallest number subset
- Number of Heads
- Minimum number of swaps needed
- Permutations and Sum
- No of Factors of n!
- Number that are not divisible
- Number of distinct subsequences
- Maximum average subarray
- Game of Death in a circle
- Division Problem
- Fraction Trouble
- Help Mommy out
- Power of Numbers
- Examination Papers
- Next larger element
- Class Average
- Gifts! Gifts! Gifts!
- Minimum Notes Required
- Final Destination
- Divisible Numbers
- Repeating GCD
- Permutation divisibility
- Nearest Power
- Ball coloring
- Arithmetic Number
- Left out candies
- Perfect Numbers
- Count digits in a factorial
- Subtraction and two numbers
- Recursively find sum of digits
- Ordering of strings
- Area of intersection of two circles
- Sachin's love for runs
- Change Bits
- Count number of substrings
- Crack the series
- Maximum value
- Raju and coins
- Largest number with given sum
- Number of matches
- GCD and Fibonacci Numbers
- Squares and divisibility
- Non Fibonacci Number
- Nth digit in sequence
- Collection of pens
- Number of solutions
- The Nth Fibonnaci
- Product of two digit numbers
- Magic numbers
- Permutation with Spaces
- Element appearing once
- Equilibrium point
- Floor in a Sorted Array
- Buildings receiving sunlight
- Finding Profession
- RegEx matching
- Maximize Dot Product
- Kth boom number
- Max value
- Flip Bits
- Letter Writer
- Helping Meesa
- Faulty Keyboard
- Finding the numbers
- Sort by Set Bit Count
- Optimal walk
- Minimum Energy
- Number of digits
- Count Increasing Subsequences
- Least Prime Factor
- Left or Right Positioned Array
- Collecting Trees
- Number Game
- Happy Number
- Max and Min Products
- LCS with permutations
- Game of cells
- Time Difference
- Modified Fibonacci
- Choose and Swap
- Euler Totient
- Geometric Progression
- Equal 0, 1 and 2
- Max Length Removal
- Adding Ones
- Min Number of Flips
- Kaprekar Number
- Keith Number
- Lucas Number
- Pairs with specific difference
- Deficient Number
- Dr. Strange's powers
- Mr. Binary
- Find Maximum Sum Strictly Increasing Subarray
- Circle and Lattice Points
- Largest Even Number
- Count Pairs in an Array
- Find (a^b)%m
- Sphenic Number
- Circular Prime Number
- Min sum formed by digits
- Min Subsets with Consecutive Numbers
- Move all negative elements to end
- String Manipulation
- Minimum Steps
- Sonam Gupta and her Boyfriend
- Help Nobita
- Maximum 0’s between two immediate 1’s
- Binary Tree K level sum
- Recursively remove all adjacent duplicates
- 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
- Make it Colorful
- Last non-zero digit in factorial
- Reverse Coding
- Flood fill Algorithm
- Tom and String
- 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
- Last two digit fibonacci
- Maximum no of 1's row
- Friends Pairing Problem
- Decode the string
- Max sum in sub-arrays
- Next Greater Even Number
- Gold Mine Problem
- Smallest subarray with sum greater than x
- Odd Game
- Rahul a Geek
- Sharing
- Seeds of a number
- Game of XOR
- Find Nth root of M
- 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
- Find all pairs with a given sum
- Check if frequencies can be equal
- Shortest distance in infinite tree
- Largest zigzag sequence
- Palindromic patitioning
- 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
- Matrix Game - 1
- 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
- What is a Syllable ?
- Longest Palindromic Subsequence
- Fractional Knapsack
- K-th element of two sorted Arrays
- Evaluation of Postfix Expression
- Maximum difference Indexes
- Count subsets having distinct even numbers
- Recursive sequence
- Rod Cutting
- Decreasing Sequence
- Subset with no pair sum divisible by K
- The Drunkard
- Infix to Postfix
- 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
- ADA Noise
- Two numbers with odd occurrences
- Sequence of Sequence
- Consecutive numbers for sum
- Element in a Series
- Modular multiplicative inverse
- Transitive closure of a Graph
- Array Subset of another array
- Karatsuba Algorithm
- Smallest Positive missing number
- Divisible by 5 or not-1
- Longest Bitonic subsequence
- Count the paths
- First negative integer in every window of size k
- Length of longest subarray
- Unique substrings
- Mobile numeric keypad
- Merge two binary Max heaps
- Extract Maximum
- Sum of product of all pairs
- Game with String
- N-divisors
- Sort the pile of cards
- Sum of numbers in string
- Find the highest occurring digit in prime numbers in a range
- Paths to reach origin
- Print first letter of every word in the string
- Maximum Sum LCM
- Subarray with 0 sum
- Get Minimum Squares
- Regular polygon-1
- Rotate matrix elements clockwise
- Combine the strings
- Max Circular Subarray Sum
- Number starting with 1 in b-base
- Nth catalan number
- Subarray range with given sum
- Count number of words
- Group Anagrams Together
- Number of divisors in a given range
- Find the closest prime number to a given number
- Sum equals to Sum
- Wildcard string matching
- Find Pair Given Difference
- Sorted matrix
- Carry counter
- Determinant of a Matrix
- Top k numbers in a stream
- Possible Pairs
- Second most repeated string in a sequence
- Equalize an array in minimum operations
- Reverse vowels in a given string
- Minimum value product
- Count all possible paths from top left to bottom right
- k modulus array element
- Shortest Common Supersequence
- Sort the given array after applying the given equation
- k sorted array
- Circular tour
- Assign Mice Holes
- Mr. Modulo and Arrays
- Firing employees
- Greedy Fox
- Nth number made of prime digits
- Large number division
- Happiest Triplet
- Find pairs with given relation
- Mr Modulo and Pairs
- Painting the Fence
- Rearrange a string
- Minimum Number in a sorted rotated array
- Find distinct elements
- Sum of length
- Sort by Absolute Difference
- Euler Totient Function
- Maximum occured integer
- Divisibility by 999
- Bird and maximum fruit gathering
- Sub-Array sum divisible by K
- Corners of a Rectangle
- Rotten Oranges
- Number of Groups
- Ticket sellers
- Minimum Toogles to partition
- Primes sum
- Fibonacci Expression
- Swapping pairs make sum equal
- Number and the Digit Sum
- Money Division
- Decode It
- Sum of K Primes
- String Ignorance
- First Digit of Product of Numbers
- Break a number
- Closest Strings
- Longest alternating subsequence
- Non-decreasing subsequence
- Number of substrings divisible by 8 but not by 3
- Count ways to increase LCS length of two strings by one
- Count of strings that can be formed using a, b and c under given constraints
- Nth item through sum
- Total digits
- Broken blocks
- Sum of Divisors in an array
- Find length of longest subsequence
- Count binary strings
- Ways to write n as sum
- LCS of three strings
- Find all distinct subset (or subsequence) sums
- Longest subsequence-1
- Sum of average of all subsets
- Maximum sum Problem
- Number of permutation with K inversions
- Longest repeating and non-overlapping substring
- Count digit groupings of a number
- String comparison
- Minimum indexed character
- Longest Geometric Progression
- Consecutive Array Elements
- High-effort vs. Low-effort
- Minimum cost to fill given weight in a bag
- Longest Repeating Subsequence
- Stickler Thief
- Bell Numbers
- Maximum weight transformation of a given string
- Compute sum of digits in all numbers from 1 to n
- Longest Zig-Zag Sub Sequence
- Even and odd elements at even and odd positions
- Second Binary Digit
- Chocolate Station
- Compatible friends
- Common Subsequence
- K-Ary Tree
- Reverse a linked list
- Occurence of an integer in a Linked List
- Delete N nodes after M nodes of a linked list
- Rotate a Linked List
- Pairwise swap elements of a linked list by swapping data
- Given a linked list of 0s, 1s and 2s, sort it.
- Add two numbers represented by linked lists
- Rearrange a linked list
- Add 1 to a number represented as linked list
- linked list of strings forms a palindrome
- Compare two linked lists
- Merge 2 sorted linked list in reverse order
- Linked List in Zig-Zag fashion
- Detect Loop in linked list
- Rearrange linked list in-place
- Remove duplicates from an unsorted linked list
- Sorted insert for circular linked list
- Split a Circular Linked List into two halves
- Reverse a Doubly Linked List
- Insertion Sort
- Right View of Binary Tree
- K distance from root
- Maximum Width of Tree
- 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
- Decimal Equivalent of Binary Linked List
- Transform to Sum Tree
- Intersection of two sorted Linked lists
- Find Transition Point
- Queue using two Stacks
- Remove duplicate element from sorted Linked List
- Stack using two queues
- Level order traversal in spiral form
- Reverse Level Order Traversal
- Depth First Traversal for a Graph
- Boundary Traversal of binary tree
- Reverse alternate levels of a perfect binary tree
- Insert a node in a BST
- BFS traversal of graph
- Lowest Common Ancestor in a Binary Tree
- Determine if Two Trees are Identical
- Root to leaf path sum
- Postorder traversal from given Inorder and Preorder traversals
- Absolute List Sorting
- Lowest Common Ancestor in a BST
- Implement two stacks in an array
- Max sum path in two arrays
- Largest subarray of 0's and 1's
- Level order traversal Line by Line
- Print BST elements in given range
- The Celebrity Problem
- Largest subarray with 0 sum
- Print a Binary Tree in Vertical Order
- Minimum Depth of a Binary Tree
- Remove duplicates in small prime array
- Odd even level difference
- Almost Prime Numbers
- Binary Tree to BST
- K-Palindrome
- Find nth element of spiral matrix
- Max sum in the configuration
- Get minimum element from stack
- Unique rows in boolean matrix
- Serialize and Deserialize a Binary Tree
- Remove every k'th node
- Leaf at same level
- Is Binary Tree Heap
- Subtraction in Linked List
- Match specific pattern
- Validate an IP Address
- Find Maximum value
- Multiply two linked lists
- Distinct occurrences
- C++ STL | Set 2 (pair)
- Sorted subsequence of size 3
- Sum of subset differences
- Josephus problem
- Java Collection | Set 1 (ArrayList)
- Java Collection | Set 2 (Set)
- You and your books
- Expression Tree
- Java Collection | Set 3 (HashMap)
- 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
- Find duplicates in an array
- Multiply two polynomials II
- 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
- Merge Sort for Linked List
- Sum of given range
- Convert Ternary Expression to Binary Tree
- Maximum Bipartite Matching
- Union of Two Linked Lists
- Intersection of Two Linked Lists
- Disjoint set (Union-Find)
- Split Singly Linked List Alternatingly
- Level of a Node in Binary Tree
- Sum of leaf nodes in BST
- Mountain Subarray Problem
- Maximum path sum
- Counting Sort
- Max and min element in Binary Tree
- Perfect Binary Tree
- XOR Linked List
- Counting elements in two arrays
- Sum of digits in factorial of a number
- Reverse a string using Stack
- Linked List that is Sorted Alternatingly
- XOR of a given range
- Full binary tree
- Modify Linked List-1
- Triplet with 0 sum in BST
- Symmetric Tree
- Construct Tree from Inorder & Preorder
- Construct BST from Postorder
- Range of Composite numbers
- Arrange Consonants and Vowels
- Huffman Decoding
- Huffman Decoding-1
- Vertical sum
- Next Right Node
- Count Pairs whose sum is equal to X
- Insert in Sorted way in a Sorted DLL
- Check if Tree is Isomorphic
- Depth of node
- pth common ancestor in BST
- Predecessor and Successor
- Leaves to DLL
- Maximum Node Level
- Children Sum Parent
- Diagonal Sum In Binary Tree
- Find length of Loop
- Deletion and Reverse in Linked List
- Change of Key in BST
- Normal BST to Balanced BST
- Linked List Matrix
- Reverse First K elements of Queue
- Remove Half Nodes
- Height of Spiral Tree
- Sum of Right Leaf Nodes

- Coin Change
- Kadane's Algorithm
- Find Missing And Repeating
- Complement
- Sum Of Prime
- Number of Unique Paths
- Rank The Permutations
- Excel Sheet | Part - 1
- Maximum Sub Array
- Print Diagonally
- Wave Array
- Overlapping Intervals
- Equal Sum
- Binary String
- Next Permutation
- Longest Increasing Subsequence
- Arithmetic Progression
- 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)
- Count of n digit numbers whose sum of digits equals to given sum
- Edit Distance
- nCr
- Maximum Rectangular Area in a Histogram
- Longest Span with same Sum in two Binary arrays
- Min Coin
- Consecutive 1's not allowed
- Next Smallest Palindrome
- Game of Chocolates
- Count of Subarrays
- Path in Matrix
- Trapping Rain Water
- Count Numbers in Range
- Case-specific Sorting of Strings
- Rank of Matrix
- Sum of bit differences
- Maximize The Array
- Factorials of large numbers
- Number following a pattern
- Longest Palindrome in a String
- Modular Exponentiation for large numbers
- Concatenation of Zig-Zag String in ‘n’ Rows
- Sum of Query I
- Relative Sorting
- Black and White
- Remove minimum elements
- Largest square formed in a matrix
- Count Integral Points
- Design a tiny URL or URL shortener
- Nuts and Bolts Problem
- Rotate a 2D array without using extra space
- Special Keyboard
- Number of ways
- Dyck Path
- Minimum Cost of ropes
- Power of Largest Prime
- Sum of Query II
- Form a palindrome
- Preorder to Postorder
- Maximum length Bitonic Subarray
- Length of the longest substring
- Smallest number on left
- Longest consecutive subsequence
- Largest subsquare surrounded by ‘X’
- Maximum Sum Path in Two Arrays
- Convert an array to reduced form
- M-Coloring Problem
- Minimum steps to get desired array
- Subsequence matching
- Dimensions of Rectangle
- Handshakes
- Tic-Tac-Toe
- Number to words
- Palindromic Array
- Betting game
- Unique partitions
- Is Binary Number Multiple of 3
- Distributing Balls
- Preorder Traversal and BST
- Card Rotation
- Longest Arithmetic Progression
- Triplet Sum in Array
- Square Numbers
- Subsets with XOR value
- Jumbled Strings
- Palindromic Strings
- Max possible amount
- Cost of Sweets
- Bleak Numbers
- Super Primes
- Crazy Equations
- Divide and Subtract Game
- Product of Primes
- Coin Piles
- Satisfy the equation
- Total number of Equal Partition
- Maximum Profit
- Nodes at even distance
- Build the smallest
- Queries on Strings
- Your Social Network
- Largest number in K swaps
- Special Matrix
- Minimize the heights
- Lots of Work
- Composite and Prime
- LCM Triplet
- nCr mod M | Part 2
- Taking 1 out of 3 consecutives
- Total Decoding Messages
- Unique BST's
- Distinct Transformations
- Subsets
- Interesting Queries
- Combination Sum
- Combination Sum - Part 2
- Word Break
- K’th smallest element
- Divisible by 8
- Divisibility
- Transform String
- Sum of Subarrays
- The Smurfs
- Count Divisors of Factorial
- Maximum calorie
- Prime Factors and their Powers
- Find the pattern
- 7 Segment Display
- Longest Common Substring
- Count Number
- 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]
- Sonam Bewafa asks questions
- Count the Number of Full Binary Trees
- Minimums in Array
- Mathematical manipulation
- Snake and Ladder Problem
- Brain Game
- Tricky Subset Problem
- Shortest Source to Destination Path
- Divisibility tree
- 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
- Find all four sum numbers
- 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
- Largest prime factor
- 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
- Magical Box
- Kth Smallest Factor
- Count subsequences of type a^i b^j c^k
- Stepping Numbers
- Find the largest number
- Convex Hull
- Matrix Exponentiation
- Count in array
- Techfest and the Queue
- Kth largest element in a stream
- Water Overflow
- Magnet Array Problem
- ThrowBall at Fair
- Smallest distinct window
- James Bond and Divisors
- Minimum number of steps to reach a given number.
- Floyd Warshall
- Huffman Encoding
- Nearly Sorted Algorithm
- Optimal binary search tree
- Smallest Absolute Difference
- Geek collects the balls
- Largest Sum Subarray of Size at least K
- Little Murph and knots
- Reverse Spiral Form of Matrix
- Pyramid form
- Maximum sum Rectangle
- Maximum Intervals Overlap
- Minimum Time
- Word Wrap
- Perfect Sum Problem
- Longest Path in a matrix
- Array Pair Sum Divisibility Problem
- Job Sequencing Problem
- Cows of FooLand
- Number of palindromic strings
- Factorial and numbers
- Page Faults in LRU
- Count possible ways to construct buildings
- Min cut Square
- Image Multiplication
- N Digit numbers with digits in increasing order
- Mila and strings
- Prime factorization and geek number
- Sisters and coins
- Probability of Knight
- Two water Jug problem
- CamelCase Pattern Matching
- Count even length
- Steps by Knight
- Median In a Row-Wise sorted Matrix
- Smith Number
- Mail System Design
- Large Product-2
- Numbers with alternative 1's
- Smallest Non-Zero Number
- Count of sum of consecutives
- Longest common substring value of two numbers
- Coins and Game
- Brackets in Matrix Chain Multiplication
- Matrix Chain Multiplication
- Sum-string
- Pairs of Non Coinciding Points
- Nine Divisors
- Special Numbers
- Carmichael Numbers
- Maximum bitonic subarray sum
- 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
- Detect cycle in an undirected graph
- Min distance between two given nodes of a Binary Tree
- Maximum difference between node and its ancestor
- Operations on Binary Min Heap
- Topological sort
- Merge K sorted linked lists
- Find the number of islands
- Circular tour
- Make Binary Tree
- Generate IP Addresses
- Check if subtree
- Extreme nodes in alternate order
- Kth element in Matrix
- Clone a Binary Tree
- Remove loop in Linked List
- Implementing Dijkstra | Set 1 (Adjacency Matrix)
- Max length chain
- Minimum Spanning Tree
- Additive sequence
- Largest BST
- Interleaved Strings
- Sum of permutations
- Box Stacking
- Count Palindromic Subsequences
- Multiply two strings
- Minimum Swaps
- Strongly Connected Components (Kosaraju's Algo)
- Longest Consecutive Subsequence
- Rat in a Maze Problem
- Bipartite Graph
- Maximum subset XOR
- 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
- Trie | (Delete)
- Merge k Sorted Arrays
- Length of longest palindrome in linked list
- Bridge Edge in Graph
- Duplicate subtree in Binary Tree
- Find the missing no in string
- Top View of Binary Tree
- Smallest range in K lists
- k-th smallest element in BST
- Polynomial Addition
- Inorder Successor in BST
- Merge Sort on Doubly Linked List
- Binary Tree to CDLL
- Find a pair with given target in BST
- Count Element Occurences
- Occurences of 2 as a digit
- Complete Binary Tree
- Range LCM Queries
- Construct expression tree
- K-Sum Paths
- Foldable Binary Tree
- Leftmost and rightmost nodes of binary tree
- Construct tree from Inorder and LevelOrder
- Node at distance
- Mirror of a given node
- Pairs violating BST property
- 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
- Find Prime numbers in a range
- Largest Number formed from an Array
- Find sum of different corresponding bits for all pairs
- Rearrange an array with O(1) extra space
- Return two prime numbers
- Allocate minimum number of pages
- Sorting Elements of an Array by Frequency
- A Simple Fraction
- Largest rectangle of 1’s with swapping of columns allowed
- Path of greater than equal to k length
- Rohan's Love for Matrix
- Create your own Calculator
- nCr mod M | Part 1
- Number Formation
- X Total Shapes
- Longest valid Parentheses
- Word Break - Part 2
- Print all LCS sequences
- Minimum Cost Path
- N-Queen Problem
- Solve the Sudoku
- Strongly connected component (Tarjans's Algo)
- Generalised Fibonacci numbers
- Find median in a stream
- Travelling Salesman Problem
- Minimum number of elements
- Very Tough Problem
- Distinct palindromic substrings
- Next Optimal Move in Tic Tac Toe
- Phone directory
- QuickSort on Doubly Linked List
- Reorder List
- Binary Tree to DLL
- Tree from Postorder and Inorder
- LRU Cache
- AVL Tree Insertion
- Partition array to K subsets
- Longest Palindromic Substring in Linear Time
- Alien Dictionary
- AVL Tree Deletion
- Nodes at given distance in binary tree
- Fixing Two nodes of a BST