- Size of Binary Tree
- Inorder Traversal
- Count Leaves in Binary Tree
- 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
- Remove duplicate elements from sorted Array
- Print all possible strings
- Replace all 0's with 5
- Count zeros in a sorted matrix
- Third largest element
- Convert to Roman No
- Preorder Traversal
- Implement strstr
- C++ STL | Set 5 (queue)
- Remainder with 7
- Implement Atoi
- Minimum distance between two numbers
- Find triplets with zero sum
- Minimum element in BST
- Anagram of String
- 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
- longest substring containing '1'
- Pairwise Consecutive Elements
- Count Non-Leaf Nodes in Tree
- Product of array elements
- Stack designer
- Queue Designer
- Sum Array Puzzle
- Search an Element in an array
- Maximum Occuring Character
- Binary String
- Consecutive elements
- Factorial
- LCM And GCD
- GCD of Array
- Searching a number
- Power of 2
- Series GP
- Pythagorean Triplet
- Nth Fibonacci Number
- Sort a String
- Majority Element
- Sieve of Eratosthenes
- Shortest path from 1 to n
- Amend The Sentence
- Count possible triangles
- Rotate Array
- Permutations of a given string
- 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
- Count total set bits
- Bit Difference
- Greater on right side
- Immediate Smaller Element
- Binary Array Sorting
- Convert array into Zig-Zag fashion
- Remove character
- Number of occurrence
- k largest elements
- Remove recurring digits
- Triangle growing downwards
- Find position of set bit
- Sum of all prime numbers between 1 and N.
- Palindromic Subsequences
- Generate Binary Numbers
- Shortest direction
- Smallest number
- Find the Odd Occurence
- Angle between hour and minute hand
- Keypad typing
- Rotating an Array
- Extraction of secret message
- Even occurring elements
- Total count
- Compare two Large Numbers
- Merge and Sort
- Minimize string value
- Rotate by 90 degree
- Reverse array in groups
- Good String
- Set Bits
- Subset Sums
- Perfect Reversible String
- Max-Min conversion
- Padovan Sequence
- No of Carry Operations
- Unusual String Sort
- Minimize the sum of product
- Missing number
- Find Substring from last of the Given String
- Make a Distinct Digit Array
- String Reversal
- Reverse each word in a given string
- Demonitisation
- Permutations in array
- String with numbers at its end
- Starting Point
- Help a Thief!!!
- Encrypt the string - 1
- Replace the Bit
- Form a Triangle
- Largest subarray with GCD one
- Squares in a Matrix
- Type of array
- Sum of dependencies in a graph
- Stuffs Division
- Sort in specific order
- Check if two arrays are equal or not
- Sherlock a Detective
- Check if string is rotated by two places
- Check if divisible by 11
- Maximum sum of hour glass
- Check if divisible by 4
- Substrings with similar first and last characters
- Find first set bit
- Minimize sum of alternate product
- Check for subsequence
- Find first repeated character
- Sort the fest
- Count even substrings
- Message decoding
- Fake Profile
- Wrong Ball
- The Muskteers
- Index of first 1 in a sorted array of 0’s and 1’s
- Split the string
- Does array represent Heap
- Find the element that appears once in sorted array
- Last index of One
- Print an array in Pendulum Arrangement
- Tracks
- Transpose of Matrix
- First element to occur k times
- Check whether K-th bit is set or not
- Length of Last word
- Extract Maximum
- Uncommon characters
- Sum of numbers in string
- Find second largest element
- URLify a given string
- Print first letter of every word in the string
- Rotate Bits
- Wildcard string matching
- Sorted matrix
- Balance with respect to an array
- Equivalent Sub-Arrays
- Count pair sum
- First Come First Serve
- Friendly Array
- Swap and Maximize
- Minimum Difference among K
- Check if a string is Isogram or not
- Check Binary String
- Check Arithmetic Progression
- Fibonacci in the array
- Alternative Sorting
- Rightmost different bit
- Max value after m range operation
- Check set bits
- Fighting the darkness
- Sorting Employees
- Count Pairs Odd Xor
- Make a Palindrome
- Difficulty of sentence
- Stable Sort and Position
- Twice counter
- Shuffle integers
- Elements in the Range
- Print first n Fibonacci Numbers
- Remove repeated digits in a given number
- Maximum Integer Value
- Count triplets with sum smaller than X
- Odd to Even
- Minimum number of flipped bits
- Print Matrix in snake Pattern
- Minimum number to form the sum even
- Anagram Palindrome
- Closest Number
- Transform to prime
- First and last occurrences of X
- Positive and negative elements
- Boolean String Value
- Just One Mismatch
- Smallest number repeating K times
- The Counting Game !!
- Absolute Difference of 1
- Remove common characters and concatenate
- Powers game
- Swapping Triangles
- Sums of i-th row and i-th column
- ZERO Number
- Sum of upper and lower triangles
- Count the characters
- Find k-th character in string
- Good or Bad string
- Repeated Character
- Merge two strings
- Find the position
- Red OR Green
- Sort String
- Difference between highest and lowest occurrence
- Find unique element
- Find the fine
- Rearrange string as alternate x and y occurences
- Minimum Product of k Integers
- Maximize ∑arr[i]*i of an Array
- Sort the string in descending order
- Count number of elements between two given elements in array
- Remove all characters other than alphabets
- Find the closest number
- Sandwiched_Vowels
- Finding-Pairs
- Last index of a character in the string
- Distinct Elements in a Stream
- Print K smallest elements in their original order
- Floating point number even or odd
- Snake Case
- Check if the number is balanced
- Count the characters in each word in a given sentence
- The problem of identical arrays
- Weight of strings
- Count number of equal pairs in a string
- Number of positive integral solutions
- Extract the phone number
- Tiger Zinda Hai
- Product is even or odd?
- Remove consonants from a string
- C++ Basic Data types
- Check if actual binary representation of a number is palindrome
- C++ Corresponding position in the two strings that hold exactly the same characters.
- Most frequent word in an array of strings
- Check if strings are rotations of each other or not
- Crazy String
- Message Spreading
- Convert the string
- Perfect Square String
- Sum of f(a[i], a[j]) over all pairs in an array of n integers
- Game with nos
- Play With OR
- Tywin's War Strategy
- Ishaan Loves Chocolates
- Program for length of the longest word in a sentence
- Riya's Test
- The Penalty Shootout
- Confused pappu
- Find the Number which contain the digit d
- Maximum Perimeter of Triangle from array
- Prime String
- Height of Heap
- Average Count Array
- Java 1-d and 2-d Array
- C++ 2-D Arrays | Set-2
- Tower of Hanoi

Name

Rajat Singhal

Rank in Institute

#14

Courses Attended

Overall Coding Score: 1257

Monthly Coding Score: 6

Weekly Coding Score: 2

- 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
- 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
- Sorted insert for circular linked list
- Split a Circular Linked List into two halves
- Reverse a Doubly Linked List
- 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
- 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
- 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
- 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
- Postorder traversal from given Inorder and Preorder traversals
- Absolute List Sorting
- Lowest Common Ancestor in a BST
- Implement two stacks in an array
- 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
- Binary Tree to BST
- Max sum in the configuration
- Equilibrium index of an array
- Remove every k'th node
- Leaf at same level
- Is Binary Tree Heap
- Match specific pattern
- Validate an IP Address
- Expression Tree
- Maximum Difference
- Check if Linked List is Palindrome
- Max distance between same elements
- Longest Consecutive Subsequence
- Repetition of k length substring
- 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
- Count distinct elements in every window
- Max Level Sum in Binary Tree
- Special Stack
- Root to leaf paths sum
- Longest consecutive sequence in Binary tree
- Level order traversal
- Delete nodes greater than k
- Merge Sort for Linked List
- Union of Two Linked Lists
- Intersection of Two Linked Lists
- Insert in a Sorted List
- Split Singly Linked List Alternatingly
- Ancestors in Binary Tree
- Level of a Node in Binary Tree
- Root to Leaf Paths
- Maximum path sum
- Max and min element in Binary Tree
- Perfect Binary Tree
- XOR Linked List
- Reverse a string using Stack
- Linked List that is Sorted Alternatingly
- XOR of a given range
- Full binary tree
- Symmetric Tree
- Construct Tree from Inorder & Preorder
- Merge Lists Alternatingly
- Range of Composite numbers
- Arrange Consonants and Vowels
- 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
- Maximum Node Level
- Children Sum Parent
- Diagonal Sum In Binary Tree
- Find length of Loop
- Deletion and Reverse in Linked List
- 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
- Closest Neighbor in BST
- Sum of the Longest Bloodline of a Tree (Sum of nodes on the longest path from root to leaf node)
- 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
- Vertical Width of a Binary Tree
- Rotate doubly Linked List
- Get min at pop
- Deque Implementations
- Min Heap implementation
- Frequencies of Limited Range Array Elements
- Anagram
- Number of Unique Paths
- Wave Array
- Print Pattern
- Rotation
- Search in a Rotated Array
- Squares in N*N Chessboard
- Palindrome numbers
- Non Repeating Character
- Distinct Substrings
- First Repeating Element
- Count Occurences of Anagrams
- Count Substrings
- Check if a given string is a rotation of a palindrome
- Remove all duplicates from a given string
- Sort an array of 0s, 1s and 2s
- Finding Position
- Single Number
- Segregate even and odd nodes in a Linked List
- Element that appears once where every element occurs twice
- Count distinct pairs with difference k
- Remove minimum elements
- Array to BST
- Facing the sun
- Triangular Number
- Key Pair
- Lucky Number
- Pair in array whose sum is closest to X
- Count pairs with given sum
- Inorder Traversal and BST
- Cutting Rectangles
- Comment Removal
- Poisioned Sweet
- Two Repeated Elements
- Reach a given score
- Next in Series
- Overlapping rectangles
- Chinky and diamonds
- K-Pangrams
- Generate binary string
- Pick values
- 0 - 1 Knapsack Problem
- Pangram Strings
- Pallindrome Patterns
- Count the Reversals
- Number of ways to find two numbers
- Number of distinct subsequences
- Permutation divisibility
- Ordering of strings
- Equilibrium point
- Buildings receiving sunlight
- Kth boom number
- Finding the numbers
- Equal 0, 1 and 2
- Min Number of Flips
- Kaprekar Number
- Equal Point in Sorted Array
- Min sum formed by digits
- String Manipulation
- Help Nobita
- Binary Tree K level sum
- Reverse Coding
- Tom and String
- Pair with greatest product in array
- Decode the pattern
- Longest K unique characters substring
- Roman Number to Integer
- Largest Product Pallindrome
- Max sum in sub-arrays
- Seeds of a number
- Find largest word in dictionary
- Love For The Twins
- Sum of all substrings of a number
- Minimum Operations
- Find all pairs with a given sum
- Check if frequencies can be equal
- Shortest distance in infinite tree
- Meta Strings
- Numbers with same first and last digit
- Sid and his prime money
- Race in Fooland
- Excel Sheet | Part - 2
- Largest Fibonacci Subsequence
- Evaluation of Postfix Expression
- Common elements
- Rod Cutting
- Decreasing Sequence
- Fill array with 1's
- Element in a Series
- Array Subset of another array
- Karatsuba Algorithm
- Divisible by 5 or not-1
- Paths to reach origin
- Subarray with 0 sum
- Faulty wiring and Bulbs
- Regular polygon-1
- Combine the strings
- Group Anagrams Together
- Number of divisors in a given range
- Sum equals to Sum
- Count the elements
- Possible Pairs
- Shortest Common Supersequence
- Assign Mice Holes
- Large number division
- Rearrange a string
- Find distinct elements
- Sum of length
- Bird and maximum fruit gathering
- Ticket sellers
- Swapping pairs make sum equal
- Decode It
- Closest Strings
- Minimum indexed character
- Remaining String
- Power Set
- Find the most frequent digit
- Compute nCr % p
- Maximum number of zeroes
- Transform the array
- Even Fibonacci Numbers Sum
- Prime factors of LCM of array elements
- Pell Number
- Maximum sum of subarray less than or equal to x
- Maximum possible sum
- Roll the characters of a String
- K-Ary Tree
- Query and Array
- Count the triplets
- Star elements
- Three consecutive duplicates
- Completing tasks
- Special Numbers
- Sum of two large numbers
- Largest number in one swap
- Quick Exponents
- Remove minimum number of elements
- Maximum value of expression
- Pairs with Positive Negative values
- Count the pairs with maximum difference
- Numbers containing 1, 2 and 3
- Number of subarrays whose minimum and maximum are same
- Find k-th missing element
- Ana and Sweets
- Incomplete Array
- Sum Indexes
- Find unit digit in a Product
- GeeksforGeeks New System
- Equal Sums
- Cluster all the 1 in a given string
- Maximum number of characters between any two same character
- Cumulative frequency of count of each element in an unsorted array
- Minimum element whose N-th power is greater than product of an array
- Next Happy Number
- Missing Intervals
- Non-Repeating Element
- Longest common prefix
- Roof Top
- Gambling Stark
- Smallest subarray with all occurrences of a most frequent element
- Maximum distinct elements after removing K elements
- Smallest sub-array with all occurences of most frequent element
- Remove leading zeros from an IP address
- The invariable units digit
- Form a number divisible by 3 using array digits
- Check if array contains contiguous integers with duplicates allowed
- Rearrange an array such that arr[i] = i
- Cosmic Number
- Winner of an election
- Ease the Array
- Amicable Pair
- Numbers with prime frequencies greater than or equal to k
- Easy string
- Count pairs Sum in matrices
- Print Binary Tree levels in sorted order
- Convert a sentence into its equivalent mobile numeric keypad sequence
- Arya's Long String
- Longest substring with equal number of 0s and 1s
- Charul and vessels
- Print Bracket Number
- Dr. Zora's Algorithm
- The Even Array
- The Modified String
- Minimum changes to make all substrings distinct
- Reaching the heights
- Delete array elements which are smaller than next or become smaller
- Divisor Product
- Smallest greater elements in whole array
- Penalty Shooters
- XOR Cipher

- Check for BST
- Delete without head pointer
- Intersection Point in Y Shapped Linked Lists
- Construct Binary Tree from Parent Array
- Connect Nodes at Same Level
- Flattening a Linked List
- The Celebrity Problem
- Find the number of islands
- Get minimum element from stack
- Circular tour
- Wildcard Pattern Matching
- Check if subtree
- Remove loop in Linked List
- Max length chain
- Box Stacking
- Merge two BST 's
- Merge k Sorted Arrays
- Node at distance
- Count Number of SubTrees having given Sum
- Add two numbers represented by Linked List
- Coin Change
- Kadane's Algorithm
- Find Missing And Repeating
- Next Permutation
- 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
- Min Coin
- Consecutive 1's not allowed
- Path in Matrix
- Trapping Rain Water
- Subset Sum Problem
- Maximize The Array
- Number of Coins
- Find Prime numbers in a range
- Stock buy and sell
- Largest Number formed from an Array
- Number of paths in a matrix with k coins
- Possible words from Phone digits
- Relative Sorting
- Design a tiny URL or URL shortener
- Minimum Cost of ropes
- Form a palindrome
- Inversion of array
- Handshakes
- Is Binary Number Multiple of 3
- Next larger element
- Total Decoding Messages
- Unique BST's
- Subsets
- Combination Sum
- Combination Sum - Part 2
- Longest Prefix Suffix
- Kth smallest element
- Longest Common Substring
- Replace O's with X's
- Knight Walk
- Print leaf nodes from preorder traversal of BST
- Unit Area of largest region of 1's
- Express as sum of power of natural numbers
- Water Overflow
- Zero Sum Subarrays
- Smallest window in a string containing all the characters of another string
- Perfect Sum Problem
- Array Pair Sum Divisibility Problem
- Job Sequencing Problem
- N Digit numbers with digits in increasing order
- Rotten Oranges
- Longest Common Prefix in an Array
- Count even length
- Steps by Knight
- Brackets in Matrix Chain Multiplication
- Matrix Chain Multiplication
- Maximum Tip Calculator
- Print N-bit binary numbers having more 1’s than 0’s