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