154 Problems
215 Problems
105 Problems
Minimum Sum Path
Reverse a Singly Linked List
Implement the Depth First Search traversal Algorithm in a Grap
Implement Breadth First Search Traversal Algorithm in a Grap
Largest Square
Find the k^{th} Largest Node in a BST
Reverse Words with Punctuation
Implement a Least Recently Used (LRU) Cache
Binary Tree Subsets with Same Sum
Find the Missing Number in a Set of Numbers from 1 to 10
Boggle Search
Distance between two nodes in a Binary Tree
Insert a Node at the Head in a Doubly Linked List
Unique Chars in a String
Balanced Braces
Mobile Game Range Module - Merging Ranges
Palindrome Tester
Count 1
s in a Binary Representation
The Deepest Node
Distance of a node from the root
Generate Combinations of Parentheses
Knapsack Algorithm
Merge Two Sorted Integer Arrays in Linear Time
Addition of Binary Strings
Iterator of Binary Search Tree with Nodes Containing Integer Data
Find Needle in a Haystack
Day with Maximum Difference in Temperatures
Soccer Team with Minimum Difference in Goals
Binary Tree Serialization
Boggle with Electronic Dictionary
Path between Two Input Words in a Dictionary
A million lines of code!
Tail N Number of Lines from an Input File
Insert a Node at a specified position in a Linked List
Iteratively, find the Max Element in a Give Binary Tree
Add Two Numbers without using Plus Sign
Integer to Roman
Recursive String Permutation
Longest Non-Repeating Substring
Isomorphic Strings
Longest Consecutive Integers Set in an Array
Multiplication of Arrays
Permutations!
Find the Max Element in a Binary Tree Recursively
Word Similarity - Edit Distance
Looping Lists : Space complexity O(n)
Check a Linked List for Loops or Cycles With O(1) Space Complexity
First N Prime Numbers
Rotate an Array to the Right.
Find the Maximum Contiguous Subsequence in an Array
Rightmost Nodes of a Tree
Find the k^{th} Smallest Node in a BST
Find the size of the Binary Tree
Selection Sort
Stock Market Oracle
Subset Summation with Number Constraint
Flip it!
Combinations and Permutations
Horizontal Flip
Add Two Linked List-ish Numbers
Matrix Max Sum Path with Dynamic Programming
Find the Lowest Common Ancestor of Two Tree Nodes
Insert Stars
Couple Sum
Remove Duplicates from a List of Words
Find the Middle of a List in a Single Pass
Power of 2
Recursively Merge Two Sorted Linked Lists
Number of Half Nodes in a Binary Tree
Find the First Non Duplicate Character in a String
Rotate a Square Image Clockwise
Bit Swapping
Minimum Depth of a Tree
Binary Representation
Graph Depth First Search
Levelorder Traversal
Is this Integer a Palindrome?
Find the N^{th} Node from the End - Linked List
Reverse a Linked List in Pairs
Flip bits in a matrix
Array Partition
Duplicate neighbours
Does an Element N Exist in a Given Binary Tree?
Delete a List's Tail Node
Look and Say Sequence
Triple Sum
Binary Search on Array of Integers
Find the Maximum BST Node
Remove Duplicate Nodes
Print a Binary Tree Level by Level
Subset Summation
Reverse Level Order Traversal
Recovering IPv4 Addresses
Delete the Node at a Particular Position in a Linked List
Introduction to Tries
Steal the Node
1-800-PROBLEM
Delete a Circular-Linked List's Tail Node
Implement the Breadth First Search Algorithm for a Graph
Delete a List's Head Node
Anagrams
Insert a Node at the Specified Position in Doubly Linked List
Rotate a Square Image Counterclockwise
Find the Number that Appears Once
Max Gain
Insert a Node at the Front of a Linked List
Reverse an Integer
Even or Odd?
Print all Possible Characters
Recursive Preorder Traversal
Fraction to Decimal
Break a Word!
Find a Node in a Binary Tree Without Using Recursion
Maximum Coordinates!
Even Split
Find the Diameter of a BST
Count the Leaves!
Insert a Node at the Tail of a Doubly Linked List
Insert a Node at the Head of a Circular Linked List
Delete the Node at the Head of a Doubly Linked List
Delete the Tail Node of a Doubly Linked List
Iterative Inorder Traversal
Maximum Sum Path
Recursive Inorder Traversal
Recursive Postorder Traversal
Iterative Postorder Traversal
Roll the Dice!
Re-arrange Linked List in Pairs
Rotate Linear Array
Parse Simple Mathematical Expressions
Minimum Sum Path in a Triangle
Natural Language Parser
Iterative Preorder Traversal
Find the Transpose of a Square Matrix
Jam into a BST
Implement the Djikstra Shortest Path Algorithm in a Graph
Find a BST Node
Find the Minimum BST Node
Remove the "N^{th} from the end" Node from a Singly-Linked List
Happy Numbers!
Making Change
BST Validation
Delete the Node at the Specific Position in a Doubly Linked List
Pascal's Triangle
Quadruple Sum
Bit Conversion
Merge k Sorted Linked Lists
Mirror Mirror on the Wall ...
Insert a Node at the End of a Linked List
Check Balanced Parentheses
Merge Two Sorted Arrays
Find the Level that has the Maximum Sum
Better Fibonacci
Convert a Binary Tree to its Mirror Image
Tail word length
Dominant Element
Merge Integer Ranges
Insert and Merge Ranges
Minimum Sub Array Size for a Target
Make Palindrome
Sum Root-to-Leaf Numbers
Range of a Number in an Array
Excel - Column Name to Number
Excel - Column Number to Column Name
Chocolate time!
Unique Routes!
Evaluate Postfix Notation
Decode Numbers!
Circular route
Minimum Window Sequence
Validate a Sudoku
Robbery
Division
Longest Common Prefix in a group of Strings
Wildcard Pattern Matching
Binary Gap
Repeated Sequences(DNA)
Minimum number of Jumps
Longest substring with two Unique Characters
Simplify file Path
Sorted Array into BST
Sorted Linked List into BST
Merge array into the Largest Number
Compare Two Versions
POW!
N-Ary Tree Serialization
Boggle with Paper Dictionary
Mobile Game Range Module - Inserting Ranges
Full Tree Decompression
Longest Palindromic Substring
HashMap with Random Value Picker
Find the Sum of all Elements in a Binary Tree Iteratively
Fibonacci Number
Iterative BST Validation
Find the Sum of all Elements in a Binary Tree
Height of a Binary Tree
Repeated Elements in an Array
Are these Binary Trees Identical?
Matrix Max Sum Path with DFS
Find the Maximum Number of Repetitions
Insert a Node at the Tail of a Circular Linked List
Replace all Spaces
Delete the Head Node of a Circular Linked List
Image Manipulation
Is this List a Palindrome?
Print Paths
String Compression
Snake
Print all Nodes in the Range a .. b in a given BST
Number of Full Nodes in a Binary Tree
Count Paths on a Game Board
Reverse a string
Fill in the Ancestors of the Node in a Binary Tree
Find the N^{th} Node from the end without using extra memory - Linked List
Bubble Sort
C
Java
Python