Source code are the collections of coding questions and their source code. You will find the download link at the bottom of each page.
Autocomplete with trie (3 solutions) – Code
Autocomplete is a feature that search box returns the suggestions based on what you have typed. Autocomplete with trie provides ...
Depth first search in matrix using recursion
An adjacency matrix is a 2d array representing a graph. The nodes are the headings for the rows and columns ...
Shortest path and 2nd shortest path using Dijkstra – code
Dijkstra's algorithm is an algorithm to find the shortest paths between vertices in a graph. It uses greedy technique by ...
Shortest path from source to destination in matrix – Code
Shortest path in matrix is to find the shortest distance from the the source to the destination. As you know, ...
Huffman coding and decoding – Step by step
What is huffman coding? Huffman coding is an algorithm to generate the binary code based on the frequencies of corresponding ...
Build hierarchy tree – Code
Build hierarchy tree reads employee data and build a corporation hierarchy tree from the list. HashMap plays important role to ...
Detect cycle and remove cycle in directed graph
A graph is a data structure that consists of a set of nodes (vertices) connected by edges. A graph is ...
Find K closest points to origin (3 solutions) – Time complexity explained
The K closest problem is to find K closest points to the pointer(0,0) (it is called center or origin). The ...
Prefix to postfix (2 solutions) – stack and recursion
In mathematics expressions, there are infix, prefix and postfix notations. Infix notation is characterized by the placement of operators between ...
Modulo operation and circular array
The modulo operation returns the remainder of one number divided by another. Modulo operator is a arithmetical operator, represented as ...
