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