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Here is the my solutions for problems in {leetcode, hackerrank, geeksforgeeks}

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24 Game
 
 
3-divisible Pairs
 
 
3Sum Closest
 
 
3Sum Smaller
 
 
3Sum
 
 
4 Keys Keyboard
 
 
4Sum II
 
 
Add Binary
 
 
Add Bold Tag in String
 
 
Add Digits
 
 
Add One Row to Tree
 
 
Add Strings
 
 
Add Two Numbers II
 
 
Add Two Numbers
 
 
Add and Search Word - Data structure design
 
 
All Paths From Source to Target
 
 
Ambiguous Coordinates
 
 
Arranging Coins
 
 
Array Nesting
 
 
Array Partition I
 
 
Average of Levels in Binary Tree
 
 
Backspace String Compare
 
 
Balanced Binary Tree
 
 
Balanced Brackets
 
 
Base 7
 
 
Basic Calculator II
 
 
Battleships in a Board
 
 
Beautiful Arrangement
 
 
Best Time to Buy and Sell Stock II
 
 
Best Time to Buy and Sell Stock
 
 
Binary Number with Alternating Bits
 
 
Binary Search Tree Iterator
 
 
Binary Tree Inorder Traversal
 
 
Binary Tree Level Order Traversal II
 
 
Binary Tree Level Order Traversal
 
 
Binary Tree Longest Consecutive Sequence II
 
 
Binary Tree Longest Consecutive Sequence
 
 
Binary Tree Maximum Path Sum
 
 
Binary Tree Paths
 
 
Binary Tree Postorder Traversal
 
 
Binary Tree Preorder Traversal
 
 
Binary Tree Pruning
 
 
Binary Tree Right Side View
 
 
Binary Tree Tilt
 
 
Binary Tree Upside Down
 
 
Binary Tree Vertical Order Traversal
 
 
Binary Tree Zigzag Level Order Traversal
 
 
Binary Watch
 
 
Boats to Save People
 
 
Brick Wall
 
 
Buddy Strings
 
 
Bulb Switcher
 
 
Bulls and Cows
 
 
Can Place Flowers
 
 
Candy Crush
 
 
Climbing Stairs
 
 
Clone Graph
 
 
Closest Leaf in a Binary Tree
 
 
Coin Change 2
 
 
Coin Change
 
 
Combination Sum II
 
 
Combination Sum III
 
 
Combination Sum IV
 
 
Combination Sum
 
 
Combinations
 
 
Compare Version Numbers
 
 
Construct Binary Tree from Preorder and Inorder Traversal
 
 
Construct String from Binary Tree
 
 
Container With Most Water
 
 
Contains Duplicate II
 
 
Contains Duplicate
 
 
Convert BST to Greater Tree
 
 
Convert Binary Search Tree to Sorted Doubly Linked List
 
 
Convert Sorted Array to Binary Search Tree
 
 
Convert Sorted List to Binary Search Tree
 
 
Convert a Number to Hexadecimal
 
 
Copy List with Random Pointer
 
 
Count Binary Substrings
 
 
Count Primes
 
 
Count of Smaller Numbers After Self
 
 
Counting Bits
 
 
Course Schedule
 
 
Cracking the Safe
 
 
Custom Sort String
 
 
DI String Match
 
 
Daily Temperatures
 
 
Decode String
 
 
Degree of an Array
 
 
Delete Node in a Linked List
 
 
Delete Operation for Two Strings
 
 
Design Compressed String Iterator
 
 
Design HashMap
 
 
Design Hit Counter
 
 
Design Search Autocomplete System
 
 
Design Tic-Tac-Toe
 
 
Detect Capital
 
 
Diameter of Binary Tree
 
 
Different Ways to Add Parentheses
 
 
Dungeon Game
 
 
Edit Distance
 
 
Employee Free Time
 
 
Employee Importance
 
 
Encode and Decode Strings
 
 
Equal Stacks
 
 
Equal Tree Partition
 
 
Escape The Ghosts
 
 
Evaluate Reverse Polish Notation
 
 
Excel Sheet Column Number
 
 
Excel Sheet Column Title
 
 
Factor Combinations
 
 
Factorial Trailing Zeroes
 
 
Fair Candy Swap
 
 
Falling Squares
 
 
Fibonacci Modified
 
 
Find All Duplicates in an Array
 
 
Find All Numbers Disappeared in an Array
 
 
Find Anagram Mappings
 
 
Find Bottom Left Tree Value
 
 
Find Duplicate File in System
 
 
Find Duplicate Subtrees
 
 
Find K Closest Elements
 
 
Find K Pairs with Smallest Sums
 
 
Find Largest Value in Each Tree Row
 
 
Find Leaves of Binary Tree
 
 
Find Median from Data Stream
 
 
Find Minimum in Rotated Sorted Array II
 
 
Find Minimum in Rotated Sorted Array
 
 
Find Mode in Binary Search Tree
 
 
Find Peak Element
 
 
Find Pivot Index
 
 
Find Smallest Letter Greater Than Target
 
 
Find and Replace Pattern
 
 
Find the Celebrity
 
 
Find the Difference
 
 
Find the Duplicate Number
 
 
First Bad Version
 
 
First Missing Positive
 
 
First Unique Character in a String
 
 
Fizz Buzz
 
 
Flatten 2D Vector
 
 
Flatten Binary Tree to Linked List
 
 
Flatten Nested List Iterator
 
 
Flip Game
 
 
Flipping an Image
 
 
Flood Fill
 
 
Friend Circles
 
 
Game of Thrones - I
 
 
Generalized Abbreviation
 
 
Generate Parentheses
 
 
Goat Latin
 
 
Graph Valid Tree
 
 
Group Anagrams
 
 
HackerRank in a String
 
 
Hackerland Radio Transmitters
 
 
Hamming Distance
 
 
Happy Number
 
 
Heaters
 
 
House Robber
 
 
Implement Magic Dictionary
 
 
Implement Trie Prefix Tree
 
 
Implement strStr
 
 
Increasing Subsequences
 
 
Increasing Triplet Subsequence
 
 
Insert Delete GetRandom O1
 
 
Insert Interval
 
 
Insertion Sort List
 
 
Integer Break
 
 
Integer Replacement
 
 
Integer to Roman
 
 
Intersection of Two Arrays II
 
 
Intersection of Two Arrays
 
 
Intersection of Two Linked Lists
 
 
Invert Binary Tree
 
 
Is Subsequence
 
 
Island Perimeter
 
 
Isomorphic Strings
 
 
Jewels and Stones
 
 
Judge Route Circle
 
 
Jump Game
 
 
K-diff Pairs in an Array
 
 
Keyboard Row
 
 
Keys and Rooms
 
 
Knight Dialer
 
 
Kth Largest Element in an Array
 
 
Kth Smallest Element in a BST
 
 
LRU Cache
 
 
Largest Number At Least Twice of Others
 
 
Largest Number
 
 
Largest Rectangle in Histogram
 
 
Leaf-Similar Trees
 
 
Lemonade Change
 
 
Length of Last Word
 
 
Letter Case Permutation
 
 
Letter Combinations of a Phone Number
 
 
Lexicographical Numbers
 
 
License Key Formatting
 
 
Linked List Components
 
 
Linked List Cycle II
 
 
Linked List Cycle
 
 
Linked List Random Node
 
 
Logger Rate Limiter
 
 
Lonely Pixel I
 
 
Longest Common Prefix
 
 
Longest Consecutive Sequence
 
 
Longest Continuous Increasing Subsequence
 
 
Longest Harmonious Subsequence
 
 
Longest Increasing Path in a Matrix
 
 
Longest Increasing Subsequence
 
 
Longest Palindrome
 
 
Longest Palindromic Subsequence
 
 
Longest Palindromic Substring
 
 
Longest Repeating Character Replacement
 
 
Longest Substring Without Repeating Characters
 
 
Longest Substring with At Most K Distinct Characters
 
 
Longest Substring with At Most Two Distinct Characters
 
 
Longest Univalue Path
 
 
Longest Valid Parentheses
 
 
Longest Word in Dictionary through Deleting
 
 
Longest Word in Dictionary
 
 
Lowest Common Ancestor of a Binary Search Tree
 
 
Lowest Common Ancestor of a Binary Tree
 
 
Majority Element II
 
 
Majority Element
 
 
Map Sum Pairs
 
 
Matchsticks to Square
 
 
Max Area of Island
 
 
Max Chunks To Make Sorted
 
 
Max Consecutive Ones II
 
 
Max Consecutive Ones
 
 
Max Increase to Keep City Skyline
 
 
Max Stack
 
 
Maximal Square
 
 
Maximize Distance to Closest Person
 
 
Maximum Average Subarray I
 
 
Maximum Binary Tree
 
 
Maximum Depth of Binary Tree
 
 
Maximum Distance in Arrays
 
 
Maximum Element
 
 
Maximum Length of Pair Chain
 
 
Maximum Length of Repeated Subarray
 
 
Maximum Product Subarray
 
 
Maximum Product of Three Numbers
 
 
Maximum Product of Word Lengths
 
 
Maximum Subarray
 
 
Maximum Swap
 
 
Maximum Width of Binary Tree
 
 
Meeting Rooms II
 
 
Meeting Rooms
 
 
Merge Intervals
 
 
Merge Sorted Array
 
 
Merge Two Binary Trees
 
 
Merge Two Sorted Lists
 
 
Merge k Sorted Lists
 
 
Middle of the Linked List
 
 
Min Cost Climbing Stairs
 
 
Min Stack
 
 
Minimum ASCII Delete Sum for Two Strings
 
 
Minimum Absolute Difference in BST
 
 
Minimum Add to Make Parentheses Valid
 
 
Minimum Depth of Binary Tree
 
 
Minimum Distance Between BST Nodes
 
 
Minimum Genetic Mutation
 
 
Minimum Increment to Make Array Unique
 
 
Minimum Index Sum of Two Lists
 
 
Minimum Moves to Equal Array Elements II
 
 
Minimum Moves to Equal Array Elements
 
 
Minimum Number of Arrows to Burst Balloons
 
 
Minimum Path Sum
 
 
Minimum Size Subarray Sum
 
 
Minimum Time Difference
 
 
Minimum Window Subsequence
 
 
Minimum Window Substring
 
 
Missing Number
 
 
Monotone Increasing Digits
 
 
Monotonic Array
 
 
Morgan and a String
 
 
Most Common Word
 
 
Most Frequent Subtree Sum
 
 
Most Profit Assigning Work
 
 
Move Zeroes
 
 
Moving Average from Data Stream
 
 
Multiply Strings
 
 
My Calendar I
 
 
N-Queens
 
 
N-ary Tree Preorder Traversal
 
 
Nested List Weight Sum II
 
 
Nested List Weight Sum
 
 
Next Closest Time
 
 
Non-decreasing Array
 
 
Non-overlapping Intervals
 
 
Number of 1 Bits
 
 
Number of Atoms
 
 
Number of Boomerangs
 
 
Number of Connected Components in an Undirected Graph
 
 
Number of Distinct Islands
 
 
Number of Islands
 
 
Number of Matching Subsequences
 
 
Number of Recent Calls
 
 
Number of Segments in a String
 
 
Odd Even Linked List
 
 
One Edit Distance
 
 
Output Contest Matches
 
 
Paint House
 
 
Palindrome Linked List
 
 
Palindrome Pairs
 
 
Palindrome Partitioning
 
 
Palindrome Permutation II
 
 
Palindrome Permutation
 
 
Partition Labels
 
 
Partition List
 
 
Partition to K Equal Sum Subsets
 
 
Pascal-s Triangle II
 
 
Pascal-s Triangle
 
 
Path Sum II
 
 
Path Sum III
 
 
Path Sum
 
 
Peeking Iterator
 
 
Perfect Number
 
 
Perfect Squares
 
 
Permutation in String
 
 
Permutations
 
 
Plus One Linked List
 
 
Populating Next Right Pointers in Each Node
 
 
Positions of Large Groups
 
 
Pour Water
 
 
Pow-x- n
 
 
Power of Four
 
 
Power of Three
 
 
Power of Two
 
 
Predict the Winner
 
 
Prefix and Suffix Search
 
 
Prime Number of Set Bits in Binary Representation
 
 
Print Binary Tree
 
 
Product of Array Except Self
 
 
Projection Area of 3D Shapes
 
 
Push Dominoes
 
 
Range Sum Query - Immutable
 
 
Range Sum Query 2D - Immutable
 
 
Ransom Note
 
 
Reaching Points
 
 
Rearrange String k Distance Apart
 
 
Reconstruct Itinerary
 
 
Reconstruct Original Digits from English
 
 
Recover Binary Search Tree
 
 
Rectangle Area
 
 
Relative Ranks
 
 
Remove Duplicates from Sorted Array II
 
 
Remove Duplicates from Sorted Array
 
 
Remove Duplicates from Sorted List II
 
 
Remove Duplicates from Sorted List
 
 
Remove Element
 
 
Remove K Digits
 
 
Remove Linked List Elements
 
 
Remove Nth Node From End of List
 
 
Reorder List
 
 
Reorder Log Files
 
 
Reordered Power of 2
 
 
Reorganize String
 
 
Repeated DNA Sequences
 
 
Repeated String Match
 
 
Repeated Substring Pattern
 
 
Replace Words
 
 
Reshape the Matrix
 
 
Restore IP Addresses
 
 
Reverse Bits
 
 
Reverse Integer
 
 
Reverse Linked List II
 
 
Reverse Linked List
 
 
Reverse String II
 
 
Reverse String
 
 
Reverse Vowels of a String
 
 
Reverse Words in a String III
 
 
Reverse Words in a String
 
 
Roman to Integer
 
 
Rotate Array
 
 
Rotate Image
 
 
Rotate List
 
 
Rotate String
 
 
Same Tree
 
 
Search Insert Position
 
 
Search a 2D Matrix II
 
 
Search a 2D Matrix
 
 
Search for a Range
 
 
Search in Rotated Sorted Array
 
 
Second Minimum Node In a Binary Tree
 
 
Self Dividing Numbers
 
 
Sentence Similarity II
 
 
Sentence Similarity
 
 
Serialize and Deserialize Binary Tree
 
 
Set Matrix Zeroes
 
 
Set Mismatch
 
 
Short Encoding of Words
 
 
Shortest Bridge
 
 
Shortest Completing Word
 
 
Shortest Distance to a Character
 
 
Shortest Unsorted Continuous Subarray
 
 
Shortest Word Distance II
 
 
Shortest Word Distance III
 
 
Shortest Word Distance
 
 
Shuffle an Array
 
 
Single Element in a Sorted Array
 
 
Single Number II
 
 
Single Number III
 
 
Single Number
 
 
Sliding Window Maximum
 
 
Sliding Window Median
 
 
Solve the Equation
 
 
Sort Characters By Frequency
 
 
Sort List
 
 
Spiral Matrix II
 
 
Spiral Matrix
 
 
Sqrt-x
 
 
Squares of a Sorted Array
 
 
String Compression
 
 
String to Integer -atoi
 
 
Student Attendance Record I
 
 
Subarray Product Less Than K
 
 
Subarray Sum Equals K
 
 
Subdomain Visit Count
 
 
Subsets II
 
 
Subsets
 
 
Substring with Concatenation of All Words
 
 
Subtree of Another Tree
 
 
Sum of Left Leaves
 
 
Sum of Square Numbers
 
 
Sum of Two Integers
 
 
Summary Ranges
 
 
Surrounded Regions
 
 
Swap Nodes in Pairs
 
 
Symmetric Tree
 
 
Task Scheduler
 
 
Ternary Expression Parser
 
 
Text Justification
 
 
The Coin Change Problem
 
 
The Maze
 
 
Third Maximum Number
 
 
Toeplitz Matrix
 
 
Top K Frequent Elements
 
 
Top K Frequent Words
 
 
Trapping Rain Water
 
 
Triangle
 
 
Trim a Binary Search Tree
 
 
Two Sum II - Input array is sorted
 
 
Two Sum III - Data structure design
 
 
Two Sum IV - Input is a BST
 
 
Two Sum
 
 
Uncommon Words from Two Sentences
 
 
Unique Binary Search Trees
 
 
Unique Email Addresses
 
 
Unique Paths II
 
 
Unique Paths
 
 
Unique Word Abbreviation
 
 
Valid Anagram
 
 
Valid Mountain Array
 
 
Valid Palindrome II
 
 
Valid Palindrome
 
 
Valid Parentheses
 
 
Valid Parenthesis String
 
 
Valid Perfect Square
 
 
Valid Sudoku
 
 
Validate Binary Search Tree
 
 
Validate Stack Sequences
 
 
Verify Preorder Sequence in Binary Search Tree
 
 
Verify Preorder Serialization of a Binary Tree
 
 
Walls and Gates
 
 
Word Break
 
 
Word Ladder
 
 
Word Pattern
 
 
Word Search II
 
 
Word Search
 
 
ZigZag Conversion
 
 
Zigzag Iterator
 
 
Helpers.java
 
 
README.md
 
 
Unique Morse Code Words
 
 

README.md

algorithms

Here is the my solutions for problems in {leetcode, hackerrank, geeksforgeeks}

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Here is the my solutions for problems in {leetcode, hackerrank, geeksforgeeks}

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algorithms algorithm-challenges datastructures java leetcode leetcode-java

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