Rodion Efremov coderodde

An enthusiast open source software developer with BSc in computer science.

coderodde / CodeWord.java

Last active November 13, 2025 08:53

The Huffman encoder in Java.

	package io.github.coderodde.compression;

	import java.util.BitSet;

	/**
	* This class implements a <b>binary</b> code word in data compression
	* scenarios.
	*
	* @author Rodion "rodde" Efremov
	* @version 1.0.0 (Oct 28, 2025)

coderodde / CodeWord.java

Last active October 28, 2025 12:25

Data Compression Techniques 2025 - Week 1 Task 6 (Shannon-Fano coding)

	package io.github.coderodde.compression;

	import java.util.BitSet;

	/**
	* This class implements a <b>binary</b> code word in data compression
	* scenarios.
	*
	* @author Rodion "rodde" Efremov
	* @version 1.0.0 (Oct 28, 2025)

coderodde / main.c

Created October 12, 2025 15:13

Splitting a linked list into odd and even sublists.

coderodde / index.html

Last active September 20, 2025 07:02

Generating string permutations in Javascript.

	<!DOCTYPE html>
	<html>
	<head>
	<title>Letter permutations</title>
	<meta charset="UTF-8">
	<meta name="viewport" content="width=device-width, initial-scale=1.0">
	</head>
	<body>
	<script>
	const str = "ABCDEFGH";

coderodde / RotationalEnergies.java

Created July 14, 2025 09:27

A Java program generating the a_n values for rotational energies.

	package io.github.coderodde.physics.mechanics.rotation;

	import java.math.BigInteger;

	/**
	* This class computes some rotational energies of {@code n}-dimensional, solid,
	* equidense balls.
	*
	* @version 1.1.0 (Jul 14, 2025)
	* @since 1.0.0 (Jul 13, 2025)

coderodde / NdimensionalBallVolumes.java

Last active July 13, 2025 09:35

A small Java program for computing volumes of n-dimensional balls.

	package io.github.coderodde.math.simulation.volumes;

	public class NdimensionalBallVolumes {

	private static final int LARGEST_DIMENSION = 50;

	public static void main(String[] args) {
	final Volume[] volumes = generateVolumes(LARGEST_DIMENSION);
	final int maxVolumeExpressionLength =
	getMaximumVolumeExpressionLength(volumes);

coderodde / SampleMalware.txt

Created June 12, 2025 10:46

	#include <Windows.h>
	#include <sstream>

	int WINAPI WinMain(HINSTANCE hInstance,
	HINSTANCE hPrevInstance,
	PSTR lpCmdLine,
	int nCmdShow) {

	UNREFERENCED_PARAMETER(hInstance);
	UNREFERENCED_PARAMETER(hPrevInstance);

coderodde / main.cpp

Last active November 13, 2024 07:51

A C++ program for counting byte histograms in files.

coderodde / com.github.coderodde.math.BigInteger.java

Last active October 31, 2024 07:49

A simple class for holding non-negative integers with arbitrary number of digits. Supports only summation operation.

	package com.github.coderodde.math;

	import java.util.Objects;
	import java.util.Random;
	import java.util.Scanner;

	/**
	* This class represents a non-negative integer with arbitrary number of digits.
	* Instances of this class are immutable.
	*

coderodde / indexed.linked.list.entropy.dat

Last active October 30, 2024 14:13

The output of the IndexedLinkedListEntropy program.