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49 lines
1.1 KiB
Markdown
49 lines
1.1 KiB
Markdown
# `@rtsao/scc`
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Find strongly connected components of a directed graph using [Tarjan's algorithm](https://en.wikipedia.org/wiki/Tarjan%27s_strongly_connected_components_algorithm).
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This algorithm efficiently yields both a topological order and list of any cycles.
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## Installation
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```
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yarn add @rtsao/scc
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```
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```
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npm install @rtsao/scc
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```
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## Usage
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```js
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const scc = require("@rtsao/scc");
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const digraph = new Map([
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["a", new Set(["c", "d"])],
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["b", new Set(["a"])],
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["c", new Set(["b"])],
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["d", new Set(["e"])],
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["e", new Set()]
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]);
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const components = scc(digraph);
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// [ Set { 'e' }, Set { 'd' }, Set { 'b', 'c', 'a' } ]
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```
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#### Illustration of example input digraph
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```
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┌───┐ ┌───┐
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│ d │ ◀── │ a │ ◀┐
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└───┘ └───┘ │
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│ │ │
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▼ ▼ │
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┌───┐ ┌───┐ │
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│ e │ │ c │ │
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└───┘ └───┘ │
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│ │
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▼ │
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┌───┐ │
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│ b │ ─┘
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└───┘
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```
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