Source code are the collections of coding questions and their source code. You will find the download link at the bottom of each page.
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 ...
Autocomplete with trie – Code
Autocomplete is a feature that search box returns the suggestions based on what you have typed. Autocomplete with trie provides ...
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 ...
Find K closest points to origin – 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 ...
Hierholzer’s algorithm to find Euler path – undirected graph
An Euler path is a trail in a graph that visits every edge exactly once. Here we use graph data ...
Web scraping in Java – Jsoup and selenium
Web scraping is a great way to retrieve data and save the information. with a simple Java web scraping setup, ...
Get suggested friends (2 solutions) – DFS and Union Find
Get suggested friends is one of a coding question in social network applications. The data structures for social network is ...
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, ...
