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vidhayak_chacha
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C++, C, Python, Java
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2016
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705
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BASIC (54)
EASY (247)
MEDIUM (356)
HARD (48)
- Longest Even Length Substring
- Sorting Elements of an Array by Frequency
- 7 Segment Display
- Rearrange characters
- Nearly Sorted Algorithm
- Find the Maximum sum
- Last two digits of Fibonacci
- Geek and the lockers
- Reverse alternate nodes in Link List
- Add Number Linked Lists
- Merge 2 sorted linked list in reverse order
- Detect Loop in linked list
- Count BST nodes that lie in a given range
- Merge Sort
- Quick Sort
- Binary Tree from Inorder and Postorder
- Bottom View of Binary Tree
- Intersection in Y Shaped Lists
- Heap Sort
- Merge two sorted linked lists
- Add all greater values to every node in a BST
- Sum Tree
- Construct Binary Tree from Parent Array
- Connect Nodes of Levels
- Flattening a Linked List
- Diagonal Tree Traversal
- Directed Graph Cycle
- Undirected Graph Cycle
- LCA in Binary Tree
- Maximum difference between node and its ancestor
- Binary Heap Operations
- The Celebrity Problem
- Largest subarray with 0 sum
- Topological sort
- Vertical Tree Traversal
- Merge K sorted linked lists
- Find the number of islands
- Get Min from Stack
- Gas Station
- Wildcard Pattern Matching
- Generate IP Addresses
- Check if subtree
- Extreme nodes in alternate order
- Kth element in Matrix
- Is Binary Tree Heap
- Clone a Binary Tree
- Remove loop in Linked List
- Dijkstra Algorithm
- Minimum Spanning Tree
- Largest BST
- Interleaved Strings
- Count Palindromic Subsequences
- Multiply two strings
- Maximum Difference
- Palindrome Linked List
- Strongly Connected
- Rat in a Maze Problem - I
- Bipartite Graph
- Closest in BST
- BST with Dead End
- Pots of Gold Game
- Delete keys in a Linked list
- Count distinct elements in every window
- Merge k Sorted Arrays
- Root to leaf paths sum
- Longest Palindrome in Linked List
- Bridge edge in a graph
- Print Nodes having K leaves
- Find triplets with zero sum
- Sort a stack
- Duplicate Subtree
- Top View of Binary Tree
- k-th Smallest in BST
- Polynomial Addition
- Delete nodes greater than k
- Merge Sort for Linked List
- Maximum Bipartite Matching
- Union of Two Linked Lists
- Euler Circuit in an Undirected Graph
- Euler circuit and Path
- Ancestors in Binary Tree
- Pair Sum in BST
- Root to Leaf Paths
- Counting elements in two arrays
- Linked List that is Sorted Alternatingly
- Foldable Binary Tree
- Pairs violating BST property
- Isomorphic Trees
- Predecessor and Successor
- Leaves to DLL
- Children Sum in a Binary Tree
- Diagonal sum in binary tree
- Normal BST to Balanced BST
- Construct Tree from Preorder Traversal
- Check if two Nodes are Cousins
- Convert Level Order Traversal to BST
- Count Number of SubTrees having given Sum
- Vertical Width of a Binary Tree
- Path Count in Directed Graph
- Mother Vertex
- Tower Of Hanoi
- Smallest Positive Missing
- Power Of Numbers
- Possible Words From Phone Digits
- Rotate and delete
- Rearrange Array Alternately
- Rearrange an array with O(1) extra space
- Maximum Index
- Stock buy and sell
- Kadane's Algorithm
- Majority Element
- Count Inversions
- Unique BST's
- Indexes of Subarray Sum
- Count the number of possible triangles
- Triplet Sum in Array
- Boolean Matrix
- Spirally traversing a matrix
- Unit Area of largest region of 1's
- Subarrays with equal 1s and 0s
- Sort Elements by Decreasing Frequency
- Longest Consecutive Subsequence
- Case-specific Sorting of Strings
- Postfix Evaluation
- Stock span problem
- Next Greater Element
- Infix to Postfix
- K Sized Subarray Maximum
- Kth smallest element
- Job Sequencing Problem
- Minimum Platforms
- Largest number in K swaps
- Black and White
- Combination Sum
- Unique Subsets
- M-Coloring Problem
- Stickler Thief
- Ways to Reach the n'th Stair
- Egg Dropping Puzzle
- Optimal Strategy For A Game
- Minimum number of jumps
- Sum of all substrings of a number
- Longest Increasing Subsequence
- Longest Common Subsequence
- 0 - 1 Knapsack Problem
- Number of Unique Paths
- Equal Sum Partition
- Sort according to an Array
- Preorder to BST
- X Total Shapes
- Zero Sum Subarrays
- Find whether path exist
- Shortest Common Supersequence
- Nth Catalan Number
- Rotten Oranges
- Steps by Knight
- Most frequent word in an array of strings
- Count subsequences of type a^i, b^j, c^k
- Maximize The Cut Segments
- Container With Most Water
- Overlapping Intervals
- Word Break
- Sort 0s, 1s and 2s
- Paths to reach origin
- Taking 1 out of 3 consecutives
- Complement
- Maximum Sub Array
- Maximum Index
- Number of subarrays with maximum values in given range
- Flip Bits
- Equal Sum
- Top k numbers in a stream
- Count Increasing Subsequences
- Sum of Middle elements of two sorted arrays
- Single Among Doubles in a Sorted
- Consecutive 1's not allowed
- Count of Subarrays
- Single Among Doubles
- Pair Sum Closest to 0
- Search in Rotated Sorted Array
- Smallest factorial number
- Sum of bit differences
- Maximum Intervals Overlap
- Minimums in Array
- Maximize The Array
- Max absolute difference
- Max Score from Subarray Mins
- Form the Largest Number
- Marks of PCM
- Alternate Vowel and Consonant String
- Add Binary Strings
- Super Primes
- Longest subarray with sum divisible by K
- Check if a string is repetition of its substring of k-length
- Sort the given array after applying the given equation
- Row with max 1s
- Swapping pairs make sum equal
- Column name from a given column number
- Concatenation of Zig-Zag String in n Rows
- Design a tiny URL or URL shortener
- Palindrome SubStrings
- Form a palindrome
- Nuts and Bolts Problem
- Rotate a Matrix
- Longest Subarray with Sum K
- Transform String
- Count the Reversals
- count special palindromic
- Cutting Binary String
- Factorials of large numbers
- Find the N-th character
- Length of the longest substring
- Maximum Sum Path in Two Arrays
- k largest elements
- Sum of XOR of all pairs
- Magnet Array Problem
- Longest Common Substring
- Smallest distinct window
- Longest common substring value of two numbers
- Longest substring with distinct characters
- Longest Substring with K Uniques
- Longest Palindrome in a String
- Minimum steps to get desired array
- Cut rope to maximise product
- Tic Tac Toe
- Integer to Words
- String formation from substring
- Possible groups
- Longest Arithmetic Subsequence
- Rod Cutting
- Greater tower sum
- Number of pairs
- Fill array with 1's
- Minimum swaps and K together
- Longest Palindromic Subsequence
- Longest substring with equal number of 0s and 1s
- Largest Sum Subarray of Size at least K
- First negative in every window of size k
- Smallest Non-Zero Number
- Roll the characters of a String
- Minimize the Heights II
- Large Factorials
- Next higher number in one swap
- Next higher palindromic number using the same set of digits
- Minimum Deletions
- A difference of values and indexes
- Print N-bit binary numbers having more 1s than 0s
- Valid Substring
- Find patterns
- Minimum number of deletions
- Permutations of a String
- Number following a pattern
- Subsequence matching
- Previous number in one swap
- Find largest word in dictionary
- Rotate String
- Combination Sum - Part 2
- Subarrays Product Less than K
- Unique Number II
- Bleak Numbers
- Max possible amount
- Maximum calorie
- Modular Exponentiation for large numbers
- Game of XOR
- Largest prime factor
- Max Sum Increasing Subsequence
- Minimum cost to fill given weight in a bag
- Distinct Transformations
- Coin Change (Count Ways)
- Sequence of Sequence
- Count numbers with given sum
- String Subsequence
- Gold Mine Problem
- Coin Change (Minimum Coins)
- Palindromic Strings
- Perfect Sum Problem
- Fibonacci Sum
- Trail of ones
- Kth Smallest Factor
- Longest subsequence-1
- Count ways to N'th Stair(Order does not matter)
- Minimum Cost To Make Two Strings Identical
- Knapsack with Duplicate Items
- nCr
- Number of ways
- Count of sum of consecutives
- Subsets with XOR value
- Maximum path sum in matrix
- Special Keyboard
- Longest Bitonic subsequence
- Min Coin
- Get Minimum Squares
- Count possible ways to construct buildings
- Count distinct pairs with difference k
- Jumbled Strings
- Dimensions of Rectangle
- Probability of Knight
- Array Pair Sum Divisibility Problem
- Magic Triplets
- Matchsticks game
- Unique partitions
- N Digit numbers with digits in increasing order
- Fill the Tank
- Last non-zero digit in factorial
- Number of paths
- Knight Walk
- Permutation with Spaces
- Number of paths in a matrix with k coins
- Return two prime numbers
- Sum of Query II
- Prime Factors and their Powers
- Jumping Numbers
- Two water Jug problem
- Fraction to Repeating Decimal
- Numbers with alternative 1's
- Find the Safe Position
- Next Permutation
- Smaller on Left
- Divisibility
- Exit Point in a Matrix
- Longest Repeating Subsequence
- Longest alternating subsequence
- Finding Profession
- Decode the string
- Is Sudoku Valid
- Preorder Traversal and BST
- Total Decoding Messages
- Stream First Non-repeating
- Check If two Line segments Intersect
- Villain Con
- Possible paths
- Print leaf nodes from preorder traversal of BST
- Largest square formed in a matrix
- Water Overflow
- Kth Largest in a Stream
- Snake and Ladder Problem
- Satisfy the equation
- Eulerian Path in an Undirected Graph
- Transitive closure of a Graph
- Replace O's with X's
- Cost of Sweets
- Express as sum of power of natural numbers
- Find the string in grid
- Shortest Uncommon Subsequence
- Number of Palindromic paths in a Matrix
- Biconnected Graph
- Count the paths
- Floyd Warshall
- Negative weight cycle
- Flood fill Algorithm
- Form coils in a matrix
- Largest subsquare surrounded by X
- Shortest Source to Destination Path
- Maximum sum Rectangle
- Hamiltonian Path
- Recursively Remove Adjacent Duplicates
- Linked List Group Reverse
- Reorder List
- Binary Tree to DLL
- Clone List with Next and Random
- Min distance between two given nodes of a Binary Tree
- Distinct occurrences
- Box Stacking
- Maximum subset XOR
- Alien Dictionary
- Smallest range in K lists
- Fixing Two nodes of a BST
- Max Path Sum 2 Special Nodes
- Trapping Rain Water
- Smallest window containing all characters of another string
- Histogram Max Rectangular Area
- Find median in a stream
- Solve the Sudoku
- Strongly connected component (Tarjans's Algo)
- Minimum Cost Path
- Merge Without Extra Space
- The Painter's Partition Problem-II
- Distinct palindromic substrings
- Ugly Numbers
- Search Pattern (KMP-Algorithm)
- Longest Prefix Suffix
- Circle of strings
- Longest repeating and non-overlapping substring
- Sum-string
- Maximum XOR subset
- Edit Distance
- Min cut Square
- Stock Buy and Sell – Max K Transactions Allowed
- Matrix Chain Multiplication
- Bit Difference
- Boolean Parenthesization
- Longest valid Parentheses
- Longest Zig-Zag Sub Sequence
- N-Queen Problem
- Brackets in Matrix Chain Multiplication
- Geek collects the balls
- Convex Hull
- Closest Palindrome
- Travelling Salesman Problem
- Word Wrap
- Huffman Encoding
- Water Connection Problem
- Find the Maximum Flow
- Minimum operations to convert array A to B
- Replace by X
- String Ignorance
- Winner of an election
- SP - Beautiful Pairs
- Geeks and the test
- Geek and the base
- Reverse a linked list
- Delete N nodes after M nodes of a linked list
- Delete nodes having greater value on right
- Split a Linked List into two halves
- Inorder Traversal
- Bubble Sort
- Selection Sort
- Insertion Sort
- Check for BST
- Right View of Binary Tree
- K distance from root
- Mirror Tree
- Two Mirror Trees
- Maximum Width of Tree
- Delete without head pointer
- Height of Binary Tree
- Balanced Tree Check
- Check If Circular Linked List
- Left View of Binary Tree
- Delete Middle of Linked List
- Transform to Sum Tree
- Intersection Sorted Linked Lists
- Find Transition Point
- Queue using two Stacks
- Remove Duplicates from a Sorted Linked List
- Stack using two queues
- Level Order in spiral form
- Reverse Level Order Traversal
- DFS of Graph
- Stack using Linked List
- BFS of graph
- Identical Trees
- Root to leaf path sum
- Square Root
- Nodes without a Sibling
- Postorder from Inorder and Preorder
- Lowest Common Ancestor in a BST
- Binary Search
- Largest subarray of 0's and 1's
- BST Keys in a Range
- Print all possible strings
- Minimum Depth of a Binary Tree
- Odd even level difference
- Binary Tree to BST
- K-Palindrome
- Remove every k'th node
- Leaves at Same Level or Not
- Match specific pattern
- Josephus problem
- You and your books
- Expression Tree
- Generate Grey Code Sequences
- Kth largest element in BST
- Array Duplicates
- Max Level Sum in Binary Tree
- Three way partitioning
- Longest consecutive sequence in Binary tree
- Level order traversal
- Inorder Successor in BST
- Index of an Extra Element
- Intersection of Two Linked Lists
- Level of a Node in Binary Tree
- Sum of leaf nodes in BST
- Reverse Using Stack
- Symmetric Tree
- Construct BST from Postorder
- Next Right Node
- Count Pairs whose sum is equal to X
- Find length of Loop
- Queue Reversal
- Reverse first K of a Queue
- Sum of Leaf Nodes
- Sum of Right Leaf Nodes
- Sum of Left Leaf Nodes
- Closest Neighbour in BST
- Exchange the Leaf Nodes
- Sum of Leaf Nodes at Min Level
- Tilt of Binary Tree
- Delete Mid of a Stack
- Rotate doubly Linked List
- Xoring and Clearing
- Even Subsets
- Predict the Column - Java
- First Set Bit
- Power of 2
- Swap all odd and even bits
- Wave Array
- Frequencies in a Limited Array
- Array Leaders
- Floor in a Sorted Array
- Roof Top
- Print adjacency list
- Transpose of Matrix
- Rotate by 90 degree
- Anagram
- Winner of an election
- Strings Rotations of Each Other
- The Modified String
- Reverse Words
- Minimum indexed character
- Non Repeating Character
- Parenthesis Checker
- Minimum indexed character
- Generate Binary Numbers
- Minimum Cost of ropes
- Count ways to N'th Stair
- Count number of hops
- Reach a given score
- Check Equal Arrays
- Missing in Array
- Product array puzzle
- Roman Number to Integer
- Missing And Repeating
- Pairs of equals Sum
- Find Kth Rotation
- Maximum AND Value
- Pairs with certain difference
- Common in 3 Sorted Arrays
- Number and the Digit Sum
- Sorted and Rotated Minimum
- Maximum no of 1's row
- Next greater number set digits
- Search in a Row-Column sorted matrix
- String Duplicates Removal
- Min Subsets with Consecutive Numbers
- Chocolate Distribution Problem
- Count pairs Sum in matrices
- Count the triplets
- Find Pair Given Difference
- Maximum Sum Bitonic Subsequence
- Next Greater Even Number
- Bitonic Point
- 1[0]1 Pattern Count
- Largest Even Number
- Common Subsequence
- Remove b and ac from a given string
- Palindrome Sentence
- Sort in specific order
- Rearrange a string
- Ordering of strings
- Nearest multiple of 10
- Toppers Of Class
- Facing the sun
- Count Substrings
- Bitonic Generator Sort
- Two Sum - Pair with Given Sum
- Second most repeated string in a sequence
- Check if array contains contiguous integers
- Rearrange to Make arr[i] = i
- Find all pairs with a given sum
- Divisible by 8
- Rope Cutting
- The Non-repetitive String
- Modify the Array
- Convert an array to reduced form
- Find missing in second array
- String's Count
- Longest Common Prefix of Strings
- Largest Fibonacci Subsequence
- Min Manipulations to make Strings Anagram
- Min Number of Flips
- Counts Zeros Xor Pairs
- Segregate 0s and 1s
- Play With OR
- Element with left side smaller and right side greater
- Maximum sum of increasing order elements from n arrays
- Count the Zeros
- Distinct absolute array elements
- Four Elements
- The Optimal Selection
- Sorting all array elements except one
- Delete Array Elements
- Smallest greater elements in whole array
- Fitting The Array
- K-th missing element
- Pattern Searching
- Print Bracket Number
- Easy string
- Minimum changes to make all substrings distinct
- Minimal moves to form a string
- Lucas Number
- Generate binary string
- Partition a number into two divisible parts
- Is Binary Number Multiple of 3
- Extract the Number from the String
- Swap bits in byte
- Number of 1 Bits
- Maximize XOR
- Pairs with Positive Negative values
- Set Bits
- Reverse Bits
- Nth Fibonacci Number
- Copy Set Bits in Range
- Maximum 0s between two immediate 1s
- Element that appears once where every element occurs twice
- Maximum Number of 1s
- Maximum Sum Problem
- Shortest path from 1 to n
- Compute (a*b)%c
- Find sum of divisors
- Sieve of Eratosthenes
- Magic Number
- Count numbers containing 4
- Reach the Nth point
- Minimum number of Coins
- Number Of Open Doors
- Number of Groups
- Perfect Numbers
- Palindrome numbers
- Maximum height of the staircase
- Next in Series
- Adjacents are not allowed
- Page Faults in LRU
- Maximum Volume of a Rectangular Box
- Recamans sequence
- Number that are not divisible
- Rectangles in N*N Board
- Squares in N*N Chessboard
- Trailing zeroes in factorial
- Number of ways to find two numbers
- Total number of Strings
- Least Prime Factor
- Number of 1's in smallest repunits
- Save Knights
- Smallest number by rearranging digits of a given number
- Find nth root of m
- Recursive sequence
- Connell Sequence
- Tom and Jerry
- Increasing Sub Sequence
- Sum of average of all subsets
- Maximum Diamonds
- Rotate a Matrix by 180 Counterclockwise
- Row with Minimum 1s
- Primitive Typing
- Largest zigzag sequence
- Overlapping rectangles
- Print Pattern
- Sum of dependencies in a graph
- Count all possible paths from top left to bottom right
- Shortest distance in infinite tree
- Geek and the equation
- Size of Binary Tree
- Count Leaves in Binary Tree
- Postorder Traversal
- Implement stack using array
- Queue using Linked List
- Queue Using Array
- Replace all 0's with 5
- Count zeros in a sorted matrix
- Preorder Traversal
- Sum Except First and Last
- C++ STL | Set 5 (queue)
- Palindromic Array
- Peak element
- Minimum element in BST
- Sum of Binary Tree
- Count Non-Leaf Nodes in Tree
- Bit Difference
- Binary Array Sorting
- Check if a string is Isogram or not
- First n Fibonacci
- Remove repeated digits in a given number
- Replace the Bit
- Last index of One
- Exceptionally odd
- Array Subset
- Extract Maximum
- Betting game
- GCD of Array
- GCD of two numbers
- Check set bits
- Binary representation
- Check for Power
- Find position of set bit
- Change all even bits in a number to 0
- Find the fine
- Check if a number can be expressed as x^y
- LCM And GCD
- House Robber
- Check perfect square
- Prime Number
- Angle between hour and minute hand
- Tidy Number
- Count Squares
- Check if the number is Fibonacci
- Sum of Digits Divisibility
- Print the Kth Digit
- Find number of days between two given dates
- Half N by M
- Pairs of prime number
- Pattern Jumping
- Finding Position
- Check if given four points form a square
- Sorted matrix
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