- Replace all 0's with 5
- Palindromic Array
- Print alternate elements of an array
- Reverse an Array
- Maximum and Minimum Of Array Elements
- Sum Of Digits
- Sum of Array
- Number of factors
- Leap Year
- Palindrome String
- Armstrong Numbers
- Multiply 2 matrices
- Sum of Series
- Series AP
- Binary number to decimal number
- Sum of Digit is Pallindrome or not
- Automorphic Number
- Remove Spaces
- Value equal to index value
- Swap kth elements
- Second Largest
- At least two greater elements
- Reversing the vowels
- Reverse a String
- Count of smaller elements
- Split Strings
- Remove vowels from string
- Upper case conversion

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Overall Coding Score: 2409

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- 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
- Bubble Sort
- Count Leaves in Binary Tree
- Selection Sort
- Height of Binary Tree
- Finding middle element in a linked list
- Circular Linked List
- Postorder Traversal
- Implement Stack using Linked List
- Implement stack using array
- Implement Queue using Linked List
- Implement Queue using array
- Square root
- Doubly linked list Insertion
- Binary Search
- Remove duplicate elements from sorted Array
- Print all possible strings
- Replace all 0's with 5
- Count zeros in a sorted matrix
- Largest product
- Third largest element
- Convert to Roman No
- Preorder Traversal
- Implement strstr
- Search a node in BST
- Equal Sum and XOR
- C++ STL | Set 8 (unordered set)
- Smallest divisible number
- Remainder with 7
- Implement Atoi
- Find Number of Numbers
- Minimum distance between two numbers
- Find triplets with zero sum
- Operating an array
- Linked List Insertion
- Play with an array
- Minimum element in BST
- Anagram of String
- Circular Linked List Traversal
- Linked List Length Even or Odd?
- Delete Alternate Nodes
- Identical Linked Lists
- Find the Sum of Last N nodes of the Linked List
- Modular Node
- Find n/k th node in Linked list
- Maximum in Struct Array
- Queue Reversal
- Triplet Family
- Sum of Binary Tree
- Magical Number
- Insert in Middle of Linked List
- longest substring containing '1'
- Pairwise Consecutive Elements
- Nth Multiple
- Count Non-Leaf Nodes in Tree
- C++ Classes Introduction
- Mrs. S- JAVA Bits Set 1
- Product of array elements
- C++ Inheritance introduction
- C++ Call by reference
- Start Coding
- logical Operators
- Sort and Reverse Vector
- Front to Back
- Stack designer
- Queue Designer
- Set Operations
- Sum Array Puzzle
- Check if a string is Isogram or not
- Binary String
- k largest elements
- Maximum Occuring Character
- Binary String
- Consecutive elements
- Factorial
- Prime Number
- LCM And GCD
- GCD of Array
- Repetitive Addition Of Digits
- Searching a number
- Power of 2
- Series GP
- 2's Complement
- Sort The Array
- Pythagorean Triplet
- Nth Fibonacci Number
- Sort a String
- Strong Number
- Print the Kth Digit
- Doubling the value
- Majority Element
- Sieve of Eratosthenes
- Shortest path from 1 to n
- Amend The Sentence
- Count possible triangles
- Dice throw
- Rotate Array
- Permutations of a given string
- Parity of unsigned integer
- Check if the number is Fibonacci
- 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
- Number of paths
- Segregate Even and Odd numbers
- Count total set bits
- Number is sparse or not
- Bit Difference
- Count numbers containing 4
- Convert from any base to decimal
- Reverse sub array
- Odd Divisors
- Greater on right side
- Immediate Smaller Element
- Count zero
- Sum of distinct elements
- Binary Array Sorting
- Intersection of two arrays
- Union of two arrays
- Convert array into Zig-Zag fashion
- Remove character
- Number of occurrence
- Maximum repeating number
- k largest elements
- Student record
- Pairs of prime number
- Minimum difference pair
- Check if a number is power of another number
- Find position of set bit
- Sum of all prime numbers between 1 and N.
- Sum of Digits Divisibility
- Maximum money
- Ways To Tile A Floor
- Generate Binary Numbers
- Smallest number
- Count the numbers
- Find the Odd Occurence
- Angle between hour and minute hand
- Keypad typing
- Check if given four points form a square
- Maximum Possible Sum of Products
- Rotating an Array
- Total distance travelled in an array
- Sum of Products
- Missing ranges of numbers
- Help the Old Man!!!
- Punish the Students
- Searching an element in a sorted array
- Surpasser Count
- Merge and Sort
- Minimize string value
- Rotate by 90 degree
- Reverse array in groups
- The AND Gate
- The OR Gate
- 1's Complement
- Mega Sale
- Set Bits
- Subset Sums
- Longest Consecutive 1's
- Count Squares
- Padovan Sequence
- Unusual String Sort
- Minimize the sum of product
- Make a Distinct Digit Array
- Reverse each word in a given string
- Check if a number can be expressed as x^y
- Permutations in array
- String with numbers at its end
- Interesting Patterns
- Encrypt the string - 1
- Replace the Bit
- Squares in a Matrix
- Find first and last occurrence of x
- Type of array
- Sum of dependencies in a graph
- Sort in specific order
- Check if two arrays are equal or not
- Check if string is rotated by two places
- Invert the Bits
- Unique Numbers
- XOR of all elements
- Substrings with similar first and last characters
- Find first set bit
- Minimize sum of alternate product
- Check for subsequence
- Find first repeated character
- Count even substrings
- Tidy Number
- Geek and Coffee Shop
- Wrong Ball
- Index of first 1 in a sorted array of 0’s and 1’s
- Does array represent Heap
- Find the element that appears once in sorted array
- Thief trying to escape
- Last index of One
- Arranging the array
- Cyclically rotate an array by one
- Print an array in Pendulum Arrangement
- Tracks
- Transpose of Matrix
- Check whether K-th bit is set or not
- Extract Maximum
- Uncommon characters
- Sum of numbers in string
- Find the smallest and second smallest element in an array
- Find second largest element
- URLify a given string
- Print first letter of every word in the string
- Rotate Bits
- Sorted matrix
- Sum Terms Nth Row
- Smallest power of 2 greater than or equal to n
- Pair array product sum
- Pair cube count
- Count pair sum
- First Come First Serve
- Friendly Array
- Balanced Array
- Swap and Maximize
- Minimum Difference among K
- Sort the Half Sorted
- Alternative Sorting
- Rightmost different bit
- Max value after m range operation
- Check set bits
- Set kth bit
- Sorting Employees
- Count Pairs Odd Xor
- Quick Left Rotation
- Difficulty of sentence
- Toggle bits given range
- Stable Sort and Position
- Twice counter
- Shuffle integers
- Elements in the Range
- Print first n Fibonacci Numbers
- Maximum Integer Value
- Sum of distinct elements for a limited range
- Count triplets with sum smaller than X
- Linear Diophantine Equations
- Odd to Even
- Total number of Strings
- Minimum Distinct Ids
- Find the Highest number
- Change all even bits in a number to 0
- Anagram Palindrome
- Count digits in given number N which divide N
- Closest Number
- First and last occurrences of X
- Positive and negative elements
- Boolean String Value
- Part Sort
- Maximum weight difference
- Tough Competitors
- Anshuman's Favourite Number
- The Counting Game !!
- XOR Count Zero and One
- Absolute Difference of 1
- Numbers with 0 as a digit
- Remove common characters and concatenate
- Binary representation of previous number
- Left Rotate Matrix K times
- Binary representation of next number
- Find k-th character in string
- Good or Bad string
- Repeated Character
- Find the position
- Numbers having alternate bits
- Sort String
- First and last Bit
- Difference between highest and lowest occurrence
- Sum of first n terms
- G.F Series
- Find the fine
- Minimum Product of k Integers
- Maximize ∑arr[i]*i of an Array
- One's Complement
- Set the rightmost unset bit
- Sort the string in descending order
- Sum of Digits Prime/Non-Prime
- Remove all characters other than alphabets
- Ishwar and his proposals
- Find the closest number
- Sandwiched_Vowels
- Series X1
- Minimal Summing Up
- Distinct Elements in a Stream
- Make Co-prime Array
- Special Series Sum
- Special Odd Series Sum
- Maximum triplet sum in array
- Check if the number is balanced
- Count the characters in each word in a given sentence
- Find sum of even factors of a number
- The problem of identical arrays
- Number of positive integral solutions
- Numbers having alternate bits in range 1 to n
- The Remaining Cake
- Tiger Zinda Hai
- Product is even or odd?
- Remove consonants from a string
- Earthquake and the Paint Shop
- C++ Nega Bit
- Check if actual binary representation of a number is palindrome
- Compare two fractions
- C++ Corresponding position in the two strings that hold exactly the same characters.
- Product of maximum in first array and minimum in second
- Palindrome in both Decimal and Binary
- Most frequent word in an array of strings
- Check if strings are rotations of each other or not
- Sophie Germain Prime
- Encoding names
- Crazy String
- Set all odd bits
- Message Spreading
- Convert the string
- Making elements distinct
- C++ Sets
- Sum of f(a[i], a[j]) over all pairs in an array of n integers
- Inverse Permutation
- Game with nos
- Play With OR
- Tywin's War Strategy
- Ishaan's Internship
- Ishaan Loves Chocolates
- Cricket Average
- Midori and chocolates
- Ishaan's Sum Problem
- Dull Jack
- Chocolate lengths
- Factor OR Multiple
- Lottery Money
- Riya's Test
- Number Series
- GOT TV series
- Confused pappu
- Difference series
- Reducing Walls
- Multiply left and right array sum.
- Gray Code
- Gray to Binary equivalent
- Doctors Clinic
- How Many X's?
- Height of Heap
- Fibonacci to N
- Average Count Array
- Tower of Hanoi

- 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
- 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
- Merge Sort
- Quick Sort
- Right View of Binary Tree
- K distance from root
- Mirror Tree
- Two Mirror Trees
- Maximum Width of Tree
- Diameter of Binary Tree
- Check for Balanced Tree
- Heap Sort
- Nth node from end of linked list
- Left View of Binary Tree
- Delete Middle of Linked List
- Merge two sorted linked lists
- Sum Tree
- 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
- DFS of Graph
- Reverse alternate levels of a perfect binary tree
- Insert a node in a BST
- BFS of graph
- Lowest Common Ancestor in a Binary Tree
- Determine if Two Trees are Identical
- Root to leaf path sum
- Print all nodes that don't have sibling
- Absolute List Sorting
- Lowest Common Ancestor in a BST
- Implement two stacks in an array
- Binary Heap Operations
- Max sum path in two arrays
- Run Length Encoding
- Largest subarray of 0's and 1's
- Level order traversal Line by Line
- Print BST elements in given range
- Largest subarray with 0 sum
- 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
- Max sum in the configuration
- Equilibrium index of an array
- Unique rows in boolean matrix
- 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
- Distinct occurrences
- Sorted subsequence of size 3
- 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
- Longest Consecutive Subsequence
- 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
- Minimum four sum subsequence
- Count distinct elements in every window
- Max Level Sum in Binary Tree
- Special Stack
- Root to leaf paths sum
- Three way partitioning
- Sort a stack
- String Modification
- Longest consecutive sequence in Binary tree
- Level order traversal
- Peak element
- Inorder Successor in BST
- Delete nodes greater than k
- Index Of an Extra Element
- Merge Sort for Linked List
- Convert Ternary Expression to Binary Tree
- Union of Two Linked Lists
- Intersection of Two Linked Lists
- Insert in a Sorted List
- Ancestors in Binary Tree
- Level of a Node in Binary Tree
- Sum of leaf nodes in BST
- Mountain Subarray Problem
- Root to Leaf Paths
- Maximum path sum
- Counting Sort
- XOR Linked List
- Counting elements in two arrays
- Reverse a string using Stack
- Linked List that is Sorted Alternatingly
- Full binary tree
- Modify Linked List-1
- Symmetric Tree
- Construct Tree from Inorder & Preorder
- Merge Lists Alternatingly
- Arrange Consonants and Vowels
- Huffman Decoding
- Huffman Decoding-1
- Vertical sum
- Count Pairs whose sum is equal to X
- Check if Tree is Isomorphic
- 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
- Linked List Matrix
- Reverse First K elements of Queue
- Remove Half Nodes
- Height of Spiral Tree
- Sum of Leaf Nodes
- Sum of Right Leaf Nodes
- Sum of Left Leaf Nodes
- Check if two Nodes are Cousins
- ZigZag Tree Traversal
- Sum of Leaf Nodes at Min Level
- Move all zeros to the front of the linked list
- Delete middle element of a stack
- Rotate doubly Linked List
- C++ Multi-level inheritance
- C++ Template
- Learn to Comment
- Learning to be precise
- Even Odd
- While loop- printTable
- Learning Macros
- Matrix Interchange
- Magic in CPP
- Swap the objects
- Structs and Objects
- Two Dimensional World
- Learning Structs
- Delete Array
- Find the Frequency
- Back to Front
- Pair Sum in Vector
- Deque Implementations
- Min Heap implementation
- Frequency Game
- Multimap Operations
- Subarray with 0 sum
- Winner of an election
- The Modified String
- Reverse words in a given string
- Smallest window in a string containing all the characters of another string
- Minimum indexed character
- Pangram Checking
- Minimum indexed character
- Frequencies of Limited Range Array Elements
- Anagram
- Adding One
- Number of Unique Paths
- Wave Array
- Maximum Gap
- Pattern Searching
- Print Pattern
- Rotation
- Search in a Rotated Array
- Rectangles in N*N Board
- Squares in N*N Chessboard
- Palindrome numbers
- Magic Number
- Maximize Number of 1's
- Non Repeating Character
- a^b(Set 2)
- Sum of Middle Elements of two sorted arrays
- Good Pairs
- Count Occurences of Anagrams
- Reverse words in a given string
- Count Substrings
- Move all zeroes to end of array
- Remove all duplicates from a given string
- Activity Selection
- Remove “b” and “ac” from a given string
- Spirally traversing a matrix
- Sort an array of 0s, 1s and 2s
- Pairs with difference k
- Two numbers with sum closest to zero
- Finding Number
- Maximum value in a bitonic array
- Next greater number set digits
- Finding Position
- 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
- Column name from a given column number
- Maximum Product Subarray
- N meetings in one room
- Remove minimum elements
- Remove Duplicates
- Kth distance
- Addition of submatrix
- Maximum sum increasing subsequence
- Array to BST
- Sum of two numbers represented as arrays
- Facing the sun
- Triangular Number
- Max Sum without Adjacents
- Key Pair
- Maximum Difference
- Add Binary Strings
- Product array puzzle
- Reverse Bits
- Count Smaller elements
- Lucky Number
- Reach the Nth point
- Subarray with given sum
- Adjacents are not allowed
- Leaders in an array
- Swap all odd and even bits
- Count number of hops
- Equal to product
- Increment
- Count pairs with given sum
- Inorder Traversal and BST
- Cycle Race
- Segregate 0s and 1s
- Copy Set Bits in Range
- Triplet Sum in Array
- Comment Removal
- Three Great Candidates
- K closest elements
- Reach a given score
- Next in Series
- Overlapping rectangles
- Inverted triangle of stars
- Minimum element in a sorted and rotated array
- Search in a matrix
- Day of the week
- Number of 1's in smallest repunits
- Shop in Candy Store
- Generate binary string
- Missing element of AP
- Count the Zeros
- Distinct absolute array elements
- 0 - 1 Knapsack Problem
- Trail of ones
- Find the number of sub-arrays having even sum
- Skip the work
- Number of ways to find two numbers
- Minimum number of swaps needed
- Game of Death in a circle
- Help Mommy out
- Ordering of strings
- Change Bits
- Crack the series
- Element appearing once
- Equilibrium point
- Floor in a Sorted Array
- Buildings receiving sunlight
- RegEx matching
- Max value
- Finding the numbers
- Sort by Set Bit Count
- Collecting Trees
- Game of cells
- Min Number of Flips
- Circle and Lattice Points
- Largest Even Number
- Count Pairs in an Array
- Sum of elements between k1'th and k2'th smallest elements
- Min sum formed by digits
- Min Subsets with Consecutive Numbers
- String Manipulation
- Chocolate Distribution Problem
- Maximum Sum Bitonic Subsequence
- Knapsack with Duplicate Items
- Smallest factorial number
- Reverse Coding
- Flood fill Algorithm
- Pair with greatest product in array
- Decode the pattern
- Longest K unique characters substring
- Roman Number to Integer
- Maximum no of 1's row
- Drive the car
- Decode the string
- Next Greater Even Number
- Gold Mine Problem
- Seeds of a number
- Game of XOR
- Find largest word in dictionary
- Sum of all substrings of a number
- Recaman’s sequence
- Minimum Operations
- Equal point in a string of brackets
- Find all pairs with a given sum
- Meta Strings
- Check if palindromic ignoring spaces
- Race in Fooland
- Excel Sheet | Part - 2
- Find the string in grid
- Increasing Sub Sequence
- Longest Palindromic Subsequence
- Evaluation of Postfix Expression
- Maximum difference Indexes
- Common elements
- Recursive sequence
- Fill array with 1's
- 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
- Divisible by 5 or not-1
- First negative integer in every window of size k
- Game with String
- Four Elements
- Paths to reach origin
- Subarray with 0 sum
- Group Anagrams Together
- Sum equals to Sum
- Find Pair Given Difference
- Carry counter
- Count the elements
- Second most repeated string in a sequence
- Count all possible paths from top left to bottom right
- Shortest Common Supersequence
- Sort the given array after applying the given equation
- Assign Mice Holes
- Happiest Triplet
- Mr Modulo and Pairs
- Rearrange a string
- Minimum Number in a sorted rotated array
- Find distinct elements
- Largest Permutation
- Number of Groups
- Swapping pairs make sum equal
- Number and the Digit Sum
- Toppers Of Class
- Decode It
- String Ignorance
- Count the number of ways to tile the floor of size n x m using 1 x m size tiles
- Closest Strings
- Replace a word
- Bitonic Generator Sort
- Count of strings that can be formed using a, b and c under given constraints
- Nth item through sum
- Maximum sum Problem
- String comparison
- Minimum indexed character
- Longest Repeating Subsequence
- Stickler Thief
- Lucky Numbers
- Even and odd elements at even and odd positions
- Find smallest values of x and y such that ax – by = 0
- Geek and its Colored Strings
- Compute (a*b)%c
- Merging two unsorted arrays in sorted order
- Transform the array
- Smallest number by rearranging digits of a given number
- Sum of Lengths of Non-Overlapping SubArrays
- Roll the characters of a String
- Chocolate Station
- Common Subsequence
- Count the triplets
- Star elements
- Sort the way !
- Sum of two large numbers
- Print the pattern
- Prime number of set bits
- Pairs with Positive Negative values
- Convertible string
- GeeksforGeeks New System
- Set all the bits in given range of a number
- Winner of an election
- Next Happy Number
- Non-Repeating Element
- Find if string is K-Palindrome or not
- Longest common prefix
- Pairs which are Divisible by 4
- Gambling Stark
- Find winner of the Game of Nim
- Arya and The Great War
- Mystic Falls School
- Nearest multiple of 10
- Word with maximum frequency
- Check if array contains contiguous integers with duplicates allowed
- Balanced string
- Maximum height of the staircase
- Winner of an election
- Extra Perfect Numbers
- Rope Cutting
- Ease the Array
- Amicable Pair
- Print this pattern!
- Count ways to express N as the sum of 1,3 and 4
- Counts Zeros Xor Pairs
- String Modification
- Easy string
- Count pairs Sum in matrices
- Swap every two bits in bytes
- Print Binary Tree levels in sorted order
- Check if a number is divisible by 8
- XOR of two numbers after making length of their binary representations equal
- Ishaan and Sticks
- Akaash's Assignment
- Find the closest pair from two arrays
- Minimum Swaps required to group all 1’s together
- Print all bitwise subsets of a number N
- Maximum sum of increasing order elements from n arrays
- Print Bracket Number
- Maximum number of partitions that can be sorted individually to make sorted
- Searching in an array where adjacent differ by at most k
- The Even Array
- The Optimal Selection
- Minimum changes to make all substrings distinct
- Variation in Nim Game
- Sorting all array elements except one
- Reaching the heights
- Smallest greater elements in whole array
- Minimal moves to form a string
- Save Ironman
- Fitting The Array
- XOR Cipher
- Pair with given sum in a sorted array

- Given a linked list, reverse alternate nodes and append at the end
- Reverse a Linked List in groups of given size.
- Count BST nodes that lie in a given range
- Check for BST
- Tree from Postorder and Inorder
- Bottom View of Binary Tree
- Delete without head pointer
- 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
- Boundary Traversal of binary tree
- Delete a node from BST
- Detect cycle in a directed graph
- Detect cycle in an undirected graph
- Range Minimum Query
- The Celebrity Problem
- Topological sort
- Print a Binary Tree in Vertical Order
- Merge K sorted linked lists
- Find the number of islands
- Get minimum element from stack
- Serialize and Deserialize a Binary Tree
- Circular tour
- Wildcard Pattern Matching
- Max rectangle
- Make Binary Tree From Linked List
- Check if subtree
- Kth element in Matrix
- 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
- LRU Cache
- Box Stacking
- Count Palindromic Subsequences
- Multiply two strings
- Minimum Swaps to Sort
- Rat in a Maze Problem
- Max sum subarray by removing at most one element
- 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
- Print Nodes having K leaves
- Duplicate subtree in Binary Tree
- Top View of Binary Tree
- k-th smallest element in BST
- Polynomial Addition
- Merge Sort on Doubly Linked List
- Binary Tree to CDLL
- Count More than n/k Occurences
- Occurences of 2 as a digit
- K-Sum Paths
- Foldable Binary Tree
- Node at distance
- Leaves to DLL
- Construct Tree from Preorder Traversal
- Convert Level Order Traversal to BST
- Count Number of SubTrees having given Sum
- C++ Generic sort
- Swap Kth nodes from ends
- Add two numbers represented by Linked List
- Smallest Positive missing number
- Unique BST's
- Unit Area of largest region of 1's
- Subarrays with equal 1s and 0s
- Sorting Elements of an Array by Frequency
- Longest consecutive subsequence
- Case-specific Sorting of Strings
- Count ways to N'th Stair(Order does not matter)
- Coin Change
- Kadane's Algorithm
- Find Missing And Repeating
- Excel Sheet | Part - 1
- Print Diagonally
- Overlapping Intervals
- Maximum Index
- Next Permutation
- Longest Increasing Subsequence
- Parenthesis Checker
- 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
- Count of n digit numbers whose sum of digits equals to given sum
- 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
- Case-specific Sorting of Strings
- Sum of bit differences
- Subset Sum Problem
- Maximize The Array
- Factorials of large numbers
- Number of Coins
- Minimum Platforms
- Number following a pattern
- Find Prime numbers in a range
- Stock buy and sell
- Largest Number formed from an Array
- Jumping Numbers
- Longest Palindrome in a String
- Modular Exponentiation for large numbers
- Rearrange Array Alternately
- Rearrange an array with O(1) extra space
- Concatenation of Zig-Zag String in ‘n’ Rows
- Relative Sorting
- Maximum of all subarrays of size k
- Largest square formed in a matrix
- Row with max 1s
- Boolean Matrix Problem
- Sorting Elements of an Array by Frequency
- Design a tiny URL or URL shortener
- Nuts and Bolts Problem
- Rotate a 2D array without using extra space
- Special Keyboard
- Number of ways
- Minimum Cost of ropes
- Sum of Query II
- Form a palindrome
- Inversion of array
- Length of the longest substring
- Smallest number on left
- Largest subsquare surrounded by ‘X’
- Stock span problem
- Convert an array to reduced form
- Minimum steps to get desired array
- Tic-Tac-Toe
- Number to words
- Palindromic Array
- Betting game
- Is Binary Number Multiple of 3
- Possible groups
- Card Rotation
- Longest Arithmetic Progression
- Max possible amount
- Bleak Numbers
- Super Primes
- Divide and Subtract Game
- Number of pairs
- Digit multiplier
- Next larger element
- X Total Shapes
- Unique BST's
- Distinct Transformations
- Subsets
- Combination Sum
- Combination Sum - Part 2
- Word Break
- Kth smallest element
- Longest Common Substring
- Count Palindrome Sub-Strings of a String
- Check if a string is repetition of its substring of k-length
- Rotate and delete
- Trie | (Insert and Search)
- Replace O's with X's
- Knight Walk
- Find all four sum numbers
- Word Boggle
- Print leaf nodes from preorder traversal of BST
- Is Sudoku Valid
- Find whether path exist
- Unit Area 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
- K
^{th}largest element in a stream - Water Overflow
- Zero Sum Subarrays
- Magnet Array Problem
- Smallest window in a string containing all the characters of another string
- Smallest distinct window
- Huffman Encoding
- Nearly Sorted Algorithm
- Smallest Positive missing number
- Longest Bitonic subsequence
- Mobile numeric keypad
- Maximum sum Rectangle
- Maximum Intervals Overlap
- Perfect Sum Problem
- Top k numbers in a stream
- Page Faults in LRU
- Min cut Square
- N Digit numbers with digits in increasing order
- Rotten Oranges
- CamelCase Pattern Matching
- Longest Common Prefix in an Array
- Steps by Knight
- In First But Second
- Smith Number
- Mail System Design
- Row with minimum number of 1's
- Numbers with alternative 1's
- Coins and Game
- Brackets in Matrix Chain Multiplication
- Matrix Chain Multiplication
- Maximum Tip Calculator
- Leftmost Divisor
- Yes XOR No
- Subarrays with equal 1s and 0s
- Longest Sub-Array with Sum K
- The Tiny Miny
- Big Numbers Series
- Sum of XOR of all pairs
- Marks of PCM
- Container with most water
- Save Gotham!
- The Painter's Partition Problem
- Maximize the sum of selected numbers from an array to make it empty
- Lucky alive person in a circle
- Optimal Strategy For A Game

- QuickSort on Doubly Linked List
- Reorder List
- Binary Tree to DLL
- AVL Tree Insertion
- Maximum subset XOR
- Alien Dictionary
- Nodes at given distance in binary tree
- Fixing Two nodes of a BST
- Number of Turns in Binary Tree
- Solve the Sudoku
- Minimum Points To Reach Destination
- Minimum sum partition
- Maximum of minimum for every window size
- Merge Without Extra Space
- Next Smallest Palindrome
- Find sum of different corresponding bits for all pairs
- Return two prime numbers
- Allocate minimum number of pages
- A Simple Fraction
- Ugly Numbers
- Largest rectangle of 1’s with swapping of columns allowed
- Path of greater than equal to k length
- Boolean Parenthesization
- Longest valid Parentheses
- Word Break - Part 2
- Minimum Cost Path
- N-Queen Problem
- Solve the Sudoku
- Find median in a stream
- Travelling Salesman Problem
- Max Circular Subarray Sum
- Distinct palindromic substrings
- Longest Zig-Zag Sub Sequence
- Similar expressions
- Convert to Strictly increasing array
- Phone directory
- Numbers with one absolute difference
- Count the subarrays having product less than k