nik1996
STREAK
00/1464
days
Longest streak/Global longest streak
Language Used
C++, Python, C
Coding Score
1661
Problem Solved
671
Contest Rating
__
2211 points
Contributor
2211 points
Contributor
1 Point
Proficient
Proficient
100 Point
Scholar
Scholar
1k Point
Master
Master
10k Point
Ace
Ace
50k Point
0 submissions in current year
SCHOOL (0)
BASIC (52)
EASY (235)
MEDIUM (325)
HARD (59)
- SPP - Palindrome Family
- SP - Beautiful Pairs
- SP - Stack Design
- SP - BST Traversal
- SP - Second Smallest in Range
- Alternating elements
- Weigh the strings
- Adjacent Equal
- Out the Kth
- K Frequent
- Column with Minimum Difference
- Game of Function
- Power of Number
- Index of Left
- K Sum
- Shatter the Cycle
- Sum to Primes
- Student Record
- Check the Brackets
- Transmutation
- Sum Array
- Maximum Integer Value
- Triangle and Square
- M and N
- Minimum Cost of Gas
- Tower Construction
- Continuous Series
- Maximize The Profit
- The Manipulator
- Facebook friend or not?
- Does a solution exist
- Repeating Digits
- Scalene or Not
- Reverse a linked list
- Delete N nodes after M nodes of a linked list
- Pairwise swap elements of a linked list
- Node at a given index in linked list
- Delete nodes having greater value on right
- Remove duplicates from an unsorted linked list
- Split a Linked List into two halves
- Delete in a Doubly Linked List
- Inorder Traversal
- Reverse a Doubly Linked List
- Check for BST
- Right View of Binary Tree
- Mirror Tree
- Two Mirror Trees
- Maximum Width of Tree
- Delete without head pointer
- Height of Binary Tree
- Balanced Tree Check
- Kth from End of Linked List
- Middle of a Linked List
- Check If Circular Linked List
- Left View of Binary Tree
- Delete Middle of Linked List
- Transform to Sum Tree
- Intersection Sorted Linked Lists
- 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
- Identical Trees
- Root to leaf path sum
- Square Root
- Nodes without a Sibling
- Insertion at doubly linked list
- Lowest Common Ancestor in a BST
- Run Length Encoding
- Largest subarray of 0's and 1's
- Level Order Line by Line
- BST Keys in a Range
- 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
- Convert to Roman No
- Expression Tree
- Max distance between same elements
- Longest Consecutive Subsequence
- Delete in a Singly Linked List
- Minimum distance in an Array
- Array Duplicates
- Special Stack
- Longest consecutive sequence in Binary tree
- Level order traversal
- Inorder Successor in BST
- More than n/k Occurrences
- Perfect Binary Tree
- Full Binary Tree
- Triplet with 0 sum in BST
- Symmetric Tree
- Delete Alternate Nodes
- Merge Lists Alternatingly
- Maximum Pairwise Computed Value
- Queue Reversal
- Reverse first K of a Queue
- Height of Spiral Tree
- Sum of Leaf Nodes
- Sum of Right Leaf Nodes
- Sum of Left Leaf Nodes
- Closest Neighbour in BST
- Brothers From Different Roots
- Exchange the Leaf Nodes
- Sum of Leaf Nodes at Min Level
- Tilt of Binary Tree
- Convert To Doubly
- First Set Bit
- Rightmost different bit
- Check K-th Bit
- Longest Consecutive 1's
- Power of 2
- Frequencies in a Limited Array
- Equilibrium Point
- Array Leaders
- Floor in a Sorted Array
- Roof Top
- Sort by Absolute Difference
- Print Matrix in snake Pattern
- Anagram
- Isomorphic Strings
- Reverse Words
- Minimum indexed character
- Non Repeating Character
- Parenthesis Checker
- Minimum indexed character
- Generate Binary Numbers
- Minimum Cost of ropes
- N meetings in one room
- Count number of hops
- First Repeating Element
- Check Equal Arrays
- Missing in Array
- Collecting wood
- Product array puzzle
- Excel Sheet | Part - 2
- Sub array of given sum in 2-D array
- Spiral Matrix
- Lucy's home
- StayHomeTask
- Maximum selections
- LCP
- Mario & Pauline
- Tom's Theater
- Missing And Repeating
- Subarrays with given sum
- Pairs of equals Sum
- Max value
- Number of pairs with maximum sum
- Pairs which are Divisible by 4
- Pairs with certain difference
- Greedy Fox
- Sorted and Rotated Minimum
- Search in a Row-Column sorted matrix
- Move All Zeroes to End
- Min sum formed by digits
- Move all negative elements to end
- String Manipulation
- Chocolate Distribution Problem
- Count pairs Sum in matrices
- Count the triplets
- Find Pair Given Difference
- Drive the car
- Smallest subarray with sum greater than x
- Count increasing Subarrays
- Alternate Positive Negative
- Maximum Possible Sum of Products
- 1[0]1 Pattern Count
- Sort in specific order
- Nearest multiple of 10
- Toppers Of Class
- Reorganize The Array
- Facing the sun
- Difficulty of sentence
- Distinct Substrings
- Two Sum - Pair with Given Sum
- Rearrange to Make arr[i] = i
- Sort Unsorted Subarray
- Find all pairs with a given sum
- Number of occurrence
- Maximum repeating number
- Does array represent Heap
- Convert an array to reduced form
- Find missing in second array
- String's Count
- String comparison
- Min Number of Flips
- Substrings with same first and last characters
- Two sum -Pairs with 0 Sum
- At Least K Occurrences
- Maximum sum of subarray less than or equal to x
- Four Elements
- Charul and vessels
- Chocolate Station
- Pangram Strings
- Pair with given sum in a sorted array
- Print Bracket Number
- Is Binary Number Multiple of 3
- Circle and Lattice Points
- Number of 1 Bits
- Reverse Bits
- Nth Fibonacci Number
- Copy Set Bits in Range
- Toggle bits in the given range
- Element that appears once where every element occurs twice
- Maximum Sum Problem
- Maximum Product Cutting
- Shortest path from 1 to n
- Minimum steps to minimize n as per given condition
- Magic Number
- Reach the Nth point
- Minimum number of Coins
- Number Of Open Doors
- Perfect Numbers
- Pair cube count
- Ticket sellers
- Adjacents are not allowed
- Trailing zeroes in factorial
- Sum of all prime numbers between 1 and n
- Tom and Jerry
- Rearrange the Digits
- Row with Minimum 1s
- Wave Array
- COVID Spread
- Largest zigzag sequence
- Overlapping rectangles
- Help the Old Man!!!
- Print Pattern
- Sum of dependencies in a graph
- Count all possible paths from top left to bottom right
- Print Diagonally
- SPP - Range Queries
- SP - Jumping the Subtree
- The great one
- Longest Substring
- Santa and Gift
- Add the Triangles
- Increment and Move
- Maximum Simultaneous Difference
- Santa and Gift
- Rotten Oranges
- Queries in Array
- 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
- Max rectangle
- Subtraction in Linked List
- Distinct occurrences
- LRU Cache
- Box Stacking
- Alien Dictionary
- Merge Sort on Doubly Linked List
- Nodes at given distance in binary tree
- Fixing Two nodes of a BST
- Max Path Sum 2 Special Nodes
- Number of Turns in Binary Tree
- Trapping Rain Water
- Max Circular Subarray Sum
- Smallest window containing all characters
- Histogram Max Rectangular Area
- Max of min for every window size
- Find median in a stream
- Solve the Sudoku
- Merge K sorted linked lists
- Word Ladder I
- Check Tree Traversal
- The Painter's Partition Problem-II
- Count Smaller elements
- Largest rectangle of 1s with swapping of columns allowed
- Longest Prefix Suffix
- Number of distinct subsequences
- Circle of strings
- Similar expressions
- Edit Distance
- Minimum sum partition
- Palindromic Partitioning
- Stock Buy and Sell – Max K Transactions Allowed
- Matrix Chain Multiplication
- Median in a row-wise sorted Matrix
- Longest valid Parentheses
- Longest Zig-Zag Sub Sequence
- Word Break - 2
- N-Queen Problem
- Phone directory
- Longest Path in a matrix
- Word Wrap
- Maximum sum Rectangle
- Smallest Positive Integer that can not be represented as Sum
- Longest Even Length Substring
- Sorting Elements of an Array by Frequency
- Rearrange characters
- Find the Maximum sum
- SP - Special Subsequences
- SP - Playing with Stacks
- The Game of Digits
- Pattern Matcher
- Ups and Downs
- Pick the one
- Unknown Sort
- Count Students
- One in the Matrix
- Reach top of stair
- Unit Digit
- The Game of Digits
- Sorting distance
- Maximum number evaluation
- K<sup>th</sup> Maximum element of Max-Heap
- Rotate a Linked List
- Sort a linked list of 0s, 1s and 2s
- Add Number Linked Lists
- Rearrange a linked list
- Add 1 to a Linked List Number
- Merge 2 sorted linked list in reverse order
- Linked List in Zig-Zag fashion
- Quick Sort on Linked List
- Insert in Sorted Circular Linked List
- QuickSort on Doubly Linked List
- Count BST nodes that lie in a given range
- Binary Tree from Inorder and Postorder
- Bottom View of Binary Tree
- Intersection in Y Shaped Lists
- Diameter of a Binary Tree
- 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
- Tree Boundary Traversal
- Directed Graph Cycle
- Undirected Graph Cycle
- LCA in Binary Tree
- Maximum difference between node and its ancestor
- Two Stacks in an Array
- Max sum path in two arrays
- The Celebrity Problem
- Largest subarray with 0 sum
- Topological sort
- Vertical Tree Traversal
- Merge K sorted linked lists
- Find the number of islands
- Max sum in the configuration
- Gas Station
- Wildcard Pattern Matching
- Linked List to Binary Tree
- Check if subtree
- Extreme nodes in alternate order
- Kth smallest element in a Matrix
- Is Binary Tree Heap
- Clone a Binary Tree
- Validate an IP Address
- Remove loop in Linked List
- Largest BST
- Interleaved Strings
- Sorted subsequence of size 3
- Multiply two strings
- Minimum Swaps to Sort
- Implement Atoi
- Maximum Difference
- Palindrome Linked List
- Rat in a Maze Problem - I
- Bipartite Graph
- Max sum subarray by removing at most one element
- Delete keys in a Linked list
- Merge two BST 's
- Count distinct elements in every window
- k-Anagram
- Merge k Sorted Arrays
- Root to leaf paths sum
- Longest Palindrome in Linked List
- Print Nodes having K leaves
- Find triplets with zero sum
- Sort a stack
- Duplicate Subtree
- Top View of Binary Tree
- Find Common Nodes in two BSTs
- Peak element
- Polynomial Addition
- Delete nodes greater than k
- Merge Sort for Linked List
- Union of Two Linked Lists
- Binary Tree to CDLL
- Pair Sum in BST
- Complete Binary Tree
- Construct expression tree
- K Sum Paths
- Foldable Binary Tree
- Leftmost and rightmost nodes of binary tree
- Construct Tree from Inorder & Preorder
- Construct tree from Inorder and LevelOrder
- Vertical sum
- Maximum path sum from any node
- Predecessor and Successor
- Leaves to DLL
- Largest Independent Set Problem
- Right Sibling in Binary Tree
- Duplicate Subtrees
- Construct Tree from Preorder Traversal
- Sum of nodes on the longest path
- Kth Ancestor in a Tree
- 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
- SP - K Sum
- Swap Kth nodes from ends
- Count set bits
- Reverse array in groups
- Smallest Positive Missing
- Wave Array
- Possible Words From Phone Digits
- Rearrange Array Alternately
- Rearrange an array with O(1) extra space
- Stock buy and sell
- Kadane's Algorithm
- Majority Element
- Count Inversions
- Two Repeated Elements
- Indexes of Subarray Sum
- Count the number of possible triangles
- Triplet Sum in Array
- Boolean Matrix
- Spirally traversing a matrix
- Rotate by 90 degree
- Distance of nearest cell having 1
- Unit Area of largest region of 1's
- Subarray with 0 sum
- Subarrays with equal 1s and 0s
- Longest Consecutive Subsequence
- Postfix Evaluation
- Stock span problem
- Next Greater Element
- Infix to Postfix
- K Sized Subarray Maximum
- Kth smallest element
- Minimum Platforms
- Largest number in K swaps
- Stickler Thief
- Ways to Reach the n'th Stair
- Egg Dropping Puzzle
- Optimal Strategy For A Game
- Minimum number of jumps
- Longest Increasing Subsequence
- Longest Common Subsequence
- 0 - 1 Knapsack Problem
- Number of Unique Paths
- Equal Sum Partition
- Sort according to an Array
- Allocate Minimum Pages
- Preorder to BST
- X Total Shapes
- Zero Sum Subarrays
- Find whether path exist
- Implement Trie
- Shortest Common Supersequence
- Rotten Oranges
- Steps by Knight
- Lazy Kid
- Shortest Distance to Every Character
- Maximize The Cut Segments
- Container With Most Water
- Overlapping Intervals
- Word Break
- Generate Parentheses
- Number of Sweets
- Word Search
- Prerequisite Tasks
- 4 Sum - All Quadruples
- Excel Sheet | Part - 1
- Game of Corners
- Hannah and her Cookie Box
- Distorted Needle in Haystack
- Mandatory Flip Bit
- Connect the Ropes
- 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
- Sum of Subarrays
- Equal Sum
- Longest Span in two Binary Arrays
- Maximize Number of 1's
- Sum of Middle elements of two sorted arrays
- Single Among Doubles in a Sorted
- Consecutive 1's not allowed
- Count Occurences of Anagrams
- Count of Subarrays
- Single Among Doubles
- Happiest Triplet
- Painting the Fence
- Pair Sum Closest to 0
- Search in Rotated Sorted Array
- Sum of bit differences
- Maximum Intervals Overlap
- Max absolute difference
- Form the Largest Number
- Add Binary Strings
- Subarray Sum Divisible By K
- Maximum Product Subarray
- Longest subarray with sum divisible by K
- Row with max 1s
- Swapping pairs make sum equal
- Form a palindrome
- Nuts and Bolts Problem
- Rotate a Matrix
- Maximum distinct elements after removing K elements
- Longest Subarray with Sum K
- Transform String
- Count the Reversals
- Cutting Binary String
- Sum of two large numbers
- Max Sum without Adjacents
- Reverse each word in a given string
- Length of the longest substring
- The Tiny Miny
- Maximum Sum Path in Two Arrays
- k largest elements
- Longest Common Substring
- Smallest distinct window
- Longest substring with distinct characters
- Longest Substring with K Uniques
- Longest Palindrome in a String
- Minimum steps to get desired array
- Product Pair
- Tic Tac Toe
- K-th element of two Arrays
- Arranging the array
- Possible groups
- Triplets with Smaller Sum
- Rod Cutting
- Number of pairs
- Maximize the sum of selected numbers from a sorted array to make it empty
- Smallest Absolute Difference
- Longest Palindromic Subsequence
- First negative in every window of size k
- Maximum difference of zeros and ones in binary string
- Not a subset sum
- Construct binary palindrome by repeated appending and trimming
- Palindrome in Alphanumeric String
- Minimum Deletions
- Valid Substring
- Permutations of a String
- Number following a pattern
- Friends Pairing Problem
- Unique Number II
- Bleak Numbers
- Skip the work
- Maximum bitonic subarray sum
- Largest prime factor
- Angle between hour and minute hand
- Maximize dot product
- Max Sum Increasing Subsequence
- Coin Change (Count Ways)
- Count numbers with given sum
- String Subsequence
- Gold Mine Problem
- Coin Change (Minimum Coins)
- Dice throw
- Perfect Sum Problem
- Longest subsequence-1
- Count ways to N'th Stair(Order does not matter)
- Subset with sum divisible by k
- Knapsack with Duplicate Items
- Temple Offerings
- nCr
- Number of ways
- Count of sum of consecutives
- Subsets with XOR value
- Maximum path sum in matrix
- Special Keyboard
- Longest Bitonic subsequence
- Handshakes
- Count distinct pairs with difference k
- Array Pair Sum Divisibility Problem
- Stepping Numbers
- Find nth root of m
- Jumping Numbers
- Fraction to Repeating Decimal
- Next Permutation
- Next Permutation
- Strange Matrix
- Mics & Jury
- Find a pair with given target in BST
- Maximum Sum Component
- Smaller on Left
- Connect words
- Longest alternating subsequence
- Decode the string
- Is Sudoku Valid
- Total Decoding Messages
- Stream First Non-repeating
- Buying Vegetables
- Largest square formed in a matrix
- Kth Largest in a Stream
- Snake and Ladder Problem
- Geek and Strings
- Replace O's with X's
- Two odd Occuring
- Mail System Design
- Special Matrix
- Queries on a Matrix
- Broken blocks
- Nodes at even distance
- Help a Thief!!!
- Count the paths
- Largest subsquare surrounded by X
- Longest Palindromic Substring
- Rotate Array
- Game of Function
- Pairing the brackets
- Unit Digit
- Cyclic Left Shift
- Print Linked List
- Find Length of Linked List
- Count Leaves in Binary Tree
- Postorder Traversal
- Preorder Traversal
- First Occurence
- Sum Except First and Last
- Palindromic Array
- Linked List Insertion At End
- Minimum element in BST
- Circular Linked List Traversal
- Sum of Binary Tree
- Insert in Middle of Linked List
- longest substring containing '1'
- Bit Difference
- Number is sparse or not
- Binary String
- Remove common characters and concatenate
- Sum of numbers in string
- First n Fibonacci
- Value equal to index value
- Segregate Even and Odd numbers
- Swap kth elements
- Shortest direction
- Replace the Bit
- URLify a given string
- One odd Occuring
- Array Subset
- Rotating an Array
- Remove Duplicates from unsorted array
- Boolean String Value
- Minimize string value
- Find unique element
- Odd or Even
- The OR Gate
- Binary representation
- Check for Power
- Find position of set bit
- The XOR Gate
- Find the fine
- Binary Shift to Divide
- Sort first half in ascending and second half in descending
- Parity of unsigned integer
- Closest Number
- Ways To Tile A Floor
- Number of Integer solutions
- Squares in a Matrix
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