Name

Rishabh Tanwar

Rank in Institute

#3

Campus Ambassador

Overall Coding Score: 2005

Monthly Coding Score: 10

Weekly Coding Score: 10

- Product array puzzle
- Subarray with given sum
- Day of the week
- Check If two Line segments Intersect
- Finding the numbers
- Shortest Common Supersequence
- Ticket sellers
- Minimum number of deletions.
- Chocolate Station
- Prime number of set bits
- Save Ironman
- Mirror Tree
- Diameter of Binary Tree
- Heap Sort
- Print all nodes that don't have sibling
- Sort a stack
- Delete nodes greater than k
- Intersection of Two Linked Lists
- Maximum path sum
- Construct Tree from Inorder & Preorder
- Check if Tree is Isomorphic
- Sum of Leaf Nodes at Min Level
- Learning Structs
- Minimum indexed character

- Coin Change
- Kadane's Algorithm
- Complement
- Maximum Sub Array
- Overlapping Intervals
- Maximum Index
- Equal Sum
- Longest Increasing Subsequence
- Arithmetic Progression
- Parenthesis Checker
- Longest Common Subsequence
- Minimum number of jumps
- Count ways to reach the n'th stair
- Egg Dropping Puzzle
- Count of n digit numbers whose sum of digits equals to given sum
- Magic Triplets
- nCr
- Longest Span with same Sum in two Binary arrays
- Min Coin
- 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
- 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
- Number of paths in a matrix with k coins
- Jumping Numbers
- Longest Palindrome in a String
- Modular Exponentiation for large numbers
- Rearrange Array Alternately
- Concatenation of Zig-Zag String in ‘n’ Rows
- Black and White
- Maximum of all subarrays of size k
- Largest square formed in a matrix
- Row with max 1s
- 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
- Length of the longest substring
- Smallest number on left
- Longest consecutive subsequence
- Largest subsquare surrounded by ‘X’
- Maximum Sum Path in Two Arrays
- Stock span problem
- Convert an array to reduced form
- Minimum steps to get desired array
- Subsequence matching
- Dimensions of Rectangle
- Handshakes
- Tic-Tac-Toe
- Palindromic Array
- Betting game
- Unique partitions
- Is Binary Number Multiple of 3
- Possible groups
- Distributing Balls
- Maximum Sum Subsequence of length k
- Card Rotation
- Search Pattern
- Square Numbers
- Subsets with XOR value
- Jumbled Strings
- Palindromic Strings
- Cost of Sweets
- Bleak Numbers
- Super Primes
- Crazy Equations
- Divide and Subtract Game
- Number of pairs
- Smallest Sub-Array
- Product of Primes
- Coin Piles
- Satisfy the equation
- Maximum XOR subset
- Maximum Profit
- Minimum sum
- Digit multiplier
- Circle of strings
- Nodes at even distance
- Build the smallest
- Queries on Strings
- Your Social Network
- Largest number in K swaps
- Minimize the heights
- Lots of Work
- Next larger element
- Composite and Prime
- LCM Triplet
- Taking 1 out of 3 consecutives
- Distinct Transformations
- Subsets
- Matchsticks game
- Interesting Queries
- Combination Sum
- Word Break
- Longest Prefix Suffix
- Kth smallest element
- Divisible by 8
- Transform String
- 3 Divisors
- Sum of Subarrays
- The Smurfs
- Count Divisors of Factorial
- Maximum calorie
- Prime Factors and their Powers
- 7 Segment Display
- Longest Common Substring
- Easy Query
- 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
- Hamiltonian Path
- Sonam Bewafa asks questions
- Count the Number of Full Binary Trees
- Minimums in Array
- Mathematical manipulation
- Snake and Ladder Problem
- Recursively remove all adjacent duplicates
- Tricky Subset Problem
- Shortest Source to Destination Path
- Divisibility tree
- Number of Palindromic paths in a Matrix
- Trie | (Insert and Search)
- Partition a number into two divisible parts
- 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
- 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
- Find the largest number
- Convex Hull
- Matrix Exponentiation
- Count in array
- K
^{th}largest element in a stream - Water Overflow
- Zero Sum Subarrays
- Magnet Array Problem
- Smallest distinct window
- James Bond and Divisors
- Floyd Warshall
- Huffman Encoding
- Nearly Sorted Algorithm
- Infix to Postfix
- Optimal binary search tree
- Smallest Absolute Difference
- Largest Sum Subarray of Size at least K
- Find minimum s-t cut in a flow network
- Longest Bitonic subsequence
- Mobile numeric keypad
- Little Murph and knots
- Pyramid form
- Maximum Intervals Overlap
- Minimum Time
- Word Wrap
- Perfect Sum Problem
- Longest Path in a matrix
- Array Pair Sum Divisibility Problem
- Job Sequencing Problem
- First Digit
- Number of palindromic strings
- Top k numbers in a stream
- Page Faults in LRU
- Count possible ways to construct buildings
- Firing employees
- Min cut Square
- Image Multiplication
- N Digit numbers with digits in increasing order
- Rotten Oranges
- Mila and strings
- Prime factorization and geek number
- Modify array to maximize sum of adjacent differences
- Count ways to increase LCS length of two strings by one
- Sisters and coins
- Probability of Knight
- LCS of three strings
- Two water Jug problem
- Longest repeating and non-overlapping substring
- Count digit groupings of a number
- CamelCase Pattern Matching
- Longest Common Prefix in an Array
- Minimum cost to fill given weight in a bag
- Count even length
- Steps by Knight
- Median In a Row-Wise sorted Matrix
- In First But Second
- Smith Number
- Mail System Design
- Row with minimum number of 1's
- Large Product-2
- Numbers with alternative 1's
- Smallest Non-Zero Number
- Count of sum of consecutives
- Longest common substring value of two numbers
- Subarray Inversions
- Coins and Game
- Brackets in Matrix Chain Multiplication
- Matrix Chain Multiplication
- Sum-string
- Pairs of Non Coinciding Points
- Nine Divisors
- A Game of LCM
- Carmichael Numbers
- Maximum bitonic subarray sum
- Maximum Tip Calculator
- Maximum GCD Pair
- Alternate Vowel and Consonant String
- Find the element at given index
- Next higher number in one swap
- Previous number in one swap
- Recurrence Matrix
- Money Distributions
- Count divisors of product of array elements
- Print N-bit binary numbers having more 1’s than 0’s
- Next higher palindromic number using the same set of digits
- Series with largest GCD and sum equals to N
- Find the last digit when factorial of A divides factorial of B
- Biconnected Graph
- Save Your Life
- Last two digits of Fibonacci
- Pizza Mania
- Killing Spree
- Yes XOR No
- Number of subarrays with maximum values in given range
- Count of Palindromic substrings in an Index range
- Mike and Photographic Memory
- Fill the Tank
- Party in Town
- Lazy Pasha
- Longest subarray with sum divisible by K
- Subarrays with equal 1s and 0s
- Make Matrix Beautiful
- Longest Sub-Array with Sum K
- Challenge by Nikitasha
- Pasha and Primes
- Sick Pasha
- Beautiful SubSequence
- Santa Banta
- The Tiny Miny
- Letters Collection
- Hopscotch
- Sum of XOR of all pairs
- Marks of PCM
- Pass the semester
- String Conversion
- Grouping Of Numbers
- Nitika and her queries
- Geek and Strings
- Water Connection Problem
- Container with most water
- Save Gotham!
- Buying Vegetables
- The Painter's Partition Problem
- Aditya and his building blocks
- Shreyansh and his bits
- Minimum swaps and K together
- Maximize the sum of selected numbers from an array to make it empty
- Find the N-th character
- Large Factorials
- Part of it.
- Rahul and The Lift
- Lucky alive person in a circle
- count special palindromic
- Akku and Arrays
- Rat Maze With Multiple Jumps
- Construct binary palindrome by repeated appending and trimming
- Element left after performing alternate OR & XOR operation
- Castle RUN
- Smaller on Left
- A difference of values and indexes
- Possible paths between 2 vertices
- Delete nodes having greater value on right
- Quick Sort on Linked List
- Count BST nodes that lie in a given range
- 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
- 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
- The Celebrity Problem
- Topological sort
- Print a Binary Tree in Vertical Order
- Serialize and Deserialize a Binary Tree
- Circular tour
- Wildcard Pattern Matching
- Make Binary Tree From Linked List
- 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
- LRU Cache
- Box Stacking
- Count Palindromic Subsequences
- Minimum Swaps to Sort
- Strongly Connected Components (Kosaraju's Algo)
- 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
- Merge two BST 's
- Trie | (Delete)
- Merge k Sorted Arrays
- Length of longest palindrome in linked list
- Bridge Edge in Graph
- Print Nodes having K leaves
- Duplicate subtree in Binary Tree
- Find the missing no in string
- Smallest range in K lists
- k-th smallest element in BST
- Polynomial Addition
- Euler Circuit in a Directed Graph
- Euler circuit and Path
- Merge Sort on Doubly Linked List
- Binary Tree to CDLL
- Find a pair with given target in BST
- Occurences of 2 as a digit
- Populate Inorder Successor for all nodes
- Construct expression tree
- K-Sum Paths
- Foldable Binary Tree
- Leftmost and rightmost nodes of binary tree
- Construct tree from Inorder and LevelOrder
- Mirror of a given node
- Pairs violating BST property
- Leaves to DLL
- Largest Independent Set Problem
- Right Sibling in Binary Tree
- Duplicate Subtrees
- Construct Tree from Preorder Traversal
- Construct a Full Binary Tree
- Convert Level Order Traversal to BST
- Count Number of SubTrees having given Sum
- Path Count in Directed Graph
- C++ Friend function
- C++ Generic sort
- Operations on PriorityQueue
- Swap Kth nodes from ends
- Maximum sum of Non-adjacent nodes
- Smallest Positive missing number
- Unique BST's
- Distance of nearest cell having 1
- Unit Area of largest region of 1's
- Sorting Elements of an Array by Frequency
- Longest consecutive subsequence
- M-Coloring Problem
- Count ways to N'th Stair(Order does not matter)

- Minimum sum partition
- Maximum of minimum for every window size
- Head to Tail ordering
- 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
- Path of greater than equal to k length
- Assignment Problem
- Rohan's Love for Matrix
- Create your own Calculator
- Number Formation
- Longest valid Parentheses
- Word Break - Part 2
- Print all LCS sequences
- Minimum Cost Path
- Solve the Sudoku
- Strongly connected component (Tarjans's Algo)
- Generalised Fibonacci numbers
- Find median in a stream
- Travelling Salesman Problem
- Max Circular Subarray Sum
- Minimum number of elements
- Very Tough Problem
- Distinct palindromic substrings
- Longest Zig-Zag Sub Sequence
- Next Optimal Move in Tic Tac Toe
- Similar expressions
- Convert to Strictly increasing array
- Phone directory
- Numbers with one absolute difference
- Count the subarrays having product less than k
- Queries on a Matrix
- Bike Racing
- Adventure in a Maze
- Closest Palindrome
- Doctor Strange
- Kill Captain America
- Binary Tree to DLL
- AVL Tree Insertion
- Partition array to K subsets
- Alien Dictionary
- AVL Tree Deletion
- Nodes at given distance in binary tree
- Fixing Two nodes of a BST
- Number of Turns in Binary Tree