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Add Kosaraju Algorithm (#3859)

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Shivanagouda Agasimani
2023-02-08 23:35:52 +05:30
committed by GitHub
parent 54d6f79acd
commit 39df47b5f2
2 changed files with 225 additions and 0 deletions
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src/test/java/com/thealgorithms/datastructures/graphs/KosarajuTest.java Normal file
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package com.thealgorithms.datastructures.graphs;
import static org.junit.jupiter.api.Assertions.assertTrue;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import org.junit.jupiter.api.Test;
public class KosarajuTest {
private Kosaraju kosaraju = new Kosaraju();
@Test
public void findStronglyConnectedComps() {
//Create a adjacency list of graph
var n = 8;
var adjList = new ArrayList<List<Integer>>(n);
for (int i = 0; i < n; i++) {
adjList.add(new ArrayList<>());
}
adjList.get(0).add(1);
adjList.get(1).add(2);
adjList.get(2).add(0);
adjList.get(2).add(3);
adjList.get(3).add(4);
adjList.get(4).add(5);
adjList.get(4).add(7);
adjList.get(5).add(6);
adjList.get(6).add(4);
adjList.get(6).add(7);
List<List<Integer>> actualResult = kosaraju.kosaraju(n, adjList);
List<List<Integer>> expectedResult = new ArrayList<>();
/*
Expected result:
0, 1, 2
3
5, 4, 6
7
*/
expectedResult.add(Arrays.asList(1, 2, 0));
expectedResult.add(Arrays.asList(3));
expectedResult.add(Arrays.asList(5, 6, 4));
expectedResult.add(Arrays.asList(7));
assertTrue(expectedResult.equals(actualResult));
}
@Test
public void findStronglyConnectedCompsShouldGetSingleNodes() {
//Create a adjacency list of graph
var n = 8;
var adjList = new ArrayList<List<Integer>>(n);
for (int i = 0; i < n; i++) {
adjList.add(new ArrayList<>());
}
adjList.get(0).add(1);
adjList.get(1).add(2);
adjList.get(2).add(3);
adjList.get(3).add(4);
adjList.get(4).add(5);
adjList.get(5).add(6);
adjList.get(6).add(7);
adjList.get(7).add(0);
List<List<Integer>> actualResult = kosaraju.kosaraju(n, adjList);
List<List<Integer>> expectedResult = new ArrayList<>();
/*
Expected result:
0, 1, 2, 3, 4, 5, 6, 7
*/
expectedResult.add(Arrays.asList(1, 2, 3, 4, 5, 6, 7, 0));
assertTrue(expectedResult.equals(actualResult));
}
}