https://github.com/looplab/tarjan

Graph loop detection in Go using Tarjan's algorithm
https://github.com/looplab/tarjan

go graph tarjan tarjan-algorithm

Last synced: about 13 hours ago
JSON representation

Graph loop detection in Go using Tarjan's algorithm

• Host: GitHub
• URL: https://github.com/looplab/tarjan
• Owner: looplab
• License: apache-2.0
• Created: 2013-09-13T12:19:53.000Z (about 11 years ago)
• Default Branch: main
• Last Pushed: 2021-12-07T09:51:36.000Z (almost 3 years ago)
• Last Synced: 2024-08-03T23:30:43.038Z (3 months ago)
• Topics: go, graph, tarjan, tarjan-algorithm
• Language: Go
• Size: 18.6 KB
• Stars: 59
• Watchers: 3
• Forks: 11
• Open Issues: 1
• Metadata Files:
  • Readme: README.md
  • License: LICENSE

Awesome Lists containing this project

• awesome-golang-repositories - tarjan

README

        
[![PkgGoDev](https://pkg.go.dev/badge/github.com/looplab/tarjan)](https://pkg.go.dev/github.com/looplab/tarjan)

![Bulid Status](https://github.com/looplab/tarjan/actions/workflows/main.yml/badge.svg)

[![Coverage Status](https://img.shields.io/coveralls/looplab/tarjan.svg)](https://coveralls.io/r/looplab/tarjan)

[![Go Report Card](https://goreportcard.com/badge/looplab/tarjan)](https://goreportcard.com/report/looplab/tarjan)

# Tarjan

Tarjan is a graph loop detection function using Tarjan's algorithm.

The algorithm takes a input graph and produces a slice where each item is a slice of strongly connected vertices. The input graph is in form of a map where the key is a graph vertex and the value is the edges in for of a slice of vertices.

Algorithm description:

http://en.wikipedia.org/wiki/Tarjan’s_strongly_connected_components_algorithm

Based on an implementation by Gustavo Niemeyer (in mgo/txn):

http://bazaar.launchpad.net/+branch/mgo/v2/view/head:/txn/tarjan.go

Gustavo Niemeyer: http://labix.org

For API docs and examples see http://godoc.org/github.com/looplab/tarjan

# Example

```go

graph := make(map[interface{}][]interface{})

graph["1"] = []interface{}{"2"}

graph["2"] = []interface{}{"3"}

graph["3"] = []interface{}{"1"}

graph["4"] = []interface{}{"2", "3", "5"}

graph["5"] = []interface{}{"4", "6"}

graph["6"] = []interface{}{"3", "7"}

graph["7"] = []interface{}{"6"}

graph["8"] = []interface{}{"5", "7", "8"}

output := Connections(graph)

fmt.Println(output)

// Output:

// [[3 2 1] [7 6] [5 4] [8]]

```

# License

Tarjan is licensed under Apache License 2.0

http://www.apache.org/licenses/LICENSE-2.0