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README.md

algo4j

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This is an algorithm library for Java, whose core is written in C++, linked with JNI.

It is test-driven(also benchmarks), well-documented, with code generation for some special cases.

Project structure

file name usage
jni C++ codes
code_drafts something written but not used ATM
libjni.dll/libjni.so/libjni.dylib jni library
jni/cpp-test C++ tests
src/main/java source(independent)
src/main/kotlin Kotlin extension library
src/test tests

The jni library above is not included in the repo, please build it yourself, or download at:

Put it to your working directory after download or build one.

Overview

  • Binary indexed tree, including P(point)-U(update)-I(interval)-Q(query), I-U-P-Q and I-U-I-Q.
  • Trigonometric functions, including: sin, cos, tan, cot, sec, csc.
  • Union set. including path compression and heuristic merge.
  • Math utils, including fast power series, primes, fibs, etc.
  • Sequence utils, like sorts, discretization, kmp, toString, etc.
  • Graph theory algorithms, like SPFA, Floyd, Kruskal, Bellman Ford, Dijkstra, dfs, etc.
  • A Win32API interface for windows only, right call something like 'Beep'.
  • Linear data structure, Stack and Queue.
  • Minimum binary heap(priority queue), support adding and extracting.
  • Trie tree, whose key supports ASCII 32-127, as Trie : Map<String, T>.
  • Multi-threading quick sort implementation.
  • Fast power for big integers.
  • Big Integer(plus minus mul div rem), faster(usually) than java.math.BigInteger.
  • Segment Tree, multi-implementations.
  • Durable Segment Tree, multi-implementations.

Actually, every java classes are well-documented.
For more information, see JavaDocs in each java file or package-info.java.

Languages

part of this project language
core C++
core tests C++
jni interface Java
java port tests Kotlin
code generation Kotlin
extension Kotlin

Contribution

There is a README file under jni path, it's strongly-recommended right read that.

This library is Test-driven, so there are tests for every class. If you want to contribute, please offer tests for your classes.

Rules of contribution

  • Each class should be well-documented.
  • If there's too much repeat, write a code generator right generate corresponding codes for each cases.
  • For C++, you should follow the code style.
  • For each class with native methods, provide a unit-test.
  • I'll write the library itself with Java and tests with Kotlin, but I also accept Tests with other languages.
  • Issues and pull requests are always welcomed.