---
id: SCC
title: "Strongly Connected Components"
author: Benjamin Qi
prerequisites:
 - Gold - Topological Sort
 - Platinum - BCCs and 2CCs
description:
frequency: 1
---

import { Problem } from "../models";

export const metadata = {
  problems: {
    ex: [
      new Problem("CSES", "Planets & Kingdoms", "1683", "Easy", false, [], ""),
    ],
    general: [
      new Problem("CSES", "Coin Collector", "1686", "Easy", false, [], ""),
      new Problem("Old Gold", "Grass Cownoisseur", "516", "Normal", false, [], ""),
      new Problem("CF", "Catowice City", "contest/1239/problem/D", "Normal", false, [], ""),
      new Problem("POI", "Festival", "https://szkopul.edu.pl/problemset/problem/p9uJo01RR9ouMLLAYroFuQ-7/site/?key=statement", "Hard", false, [], ""),
      new Problem("Kattis", "Proving Equivalences", "equivalences", "Hard", false, [], ""),
      new Problem("CSES", "New Flight Routes", "1685", "Hard", false, [], ""),
    ],
    satEx: [
      new Problem("CSES", "Giant Pizza", "1684", "Normal", false, [], "")
    ],
  }
};

## SCCs

<problems-list problems={metadata.problems.ex} />

### Tutorial

  - Wikipedia
    - [Tarjan](https://en.wikipedia.org/wiki/Tarjan%27s_strongly_connected_components_algorithm)
    - [Kosaraju](https://en.wikipedia.org/wiki/Kosaraju%27s_algorithm)

<resources>
  <resource source="CPH" title="17 - Strong Connectivity"></resource>
  <resource source="CPC" title="7 - Graphs 1" url="07_graphs_1"></resource>
</resources>

(impls)

### Problems

<problems-list problems={metadata.problems.general} />

## 2-SAT

<problems-list problems={metadata.problems.satEx} />

(impl)

### Tutorial

<resources>
  <resource source="CF" title="2-SAT" url="blog/entry/16205"></resource>
</resources>

(KACTL at most one?)