Breadth First Search (BFS) pada Graph

BREADTH FIRST SEARCH
(BFS)
PADA GRAPH
Algoritma dan Struktur
Data
Dr. Achmad Solichin,
S.Kom, M.T.I

GRAPH
V = {0, 1, 2, 3}
E = {(0,1), (0,2), (0,3), (1,2)}
G = {V, E}
Indirect Graph

GRAPH TERMINOLOGY
 Adjacency: A vertex is said to be adjacent to another vertex if
there is an edge connecting them. Vertices 2 and 3 are not
adjacent because there is no edge between them.
 Path: A sequence of edges that allows you to go from vertex A
to vertex B is called a path. 0-1, 1-2 and 0-2 are paths from
vertex 0 to vertex 2.
 Directed Graph: A graph in which an edge (u,v) doesn't
necessarily mean that there is an edge (v, u) as well. The
edges in such a graph are represented by arrows to show the
direction of the edge.

GRAPH REPRESENTATION
1. Adjacency Matrix 2. Adjacency List

BREADTH FIRST SEARCH (BFS)
ALGORITHM
The BFS algorithm works as follows:
1. Start by putting any one of the graph's vertices at the back of a
queue.
2. Take the front item of the queue and add it to the visited list.
3. Create a list of that vertex's adjacent nodes. Add the ones which
aren't in the visited list to the back of the queue.
4. Keep repeating steps 2 and 3 until the queue is empty.

STEP BY STEP BFS ALGORITHM – 1
We use an undirected graph with 5 vertices

We start from vertex 0, the BFS algorithm starts by
putting it in the Visited list and putting all its
adjacent vertices in the queue.

Next, we visit the element at the front of queue i.e. 1
and go to its adjacent nodes. Since 0 has already
been visited, we visit 2 instead.

Vertex 2 has an unvisited adjacent vertex in 4, so we
add that to the back of the queue and visit 3, which
is at the front of the queue.

Only 4 remains in the queue since the only adjacent
node of 3 i.e. 0 is already visited. We visit it.
Since the queue is empty, we have completed the Depth First Traversal of the graph

BFS IMPLEMENTATION IN
PROGRAMMING
C C++ Java
https://qrgo.page.link/x9Seghttps://qrgo.page.link/f5aH4https://qrgo.page.link/AZAnW

REFERENCES
 Slide “Graph: Pemahaman dan Konsep Dasar Graph – Algoritma dan
Struktur Data 3” by Moh. Sjukani (Universitas Budi Luhur)
 Slide “Graph Traversal (Penelusuran Graph) – Algoritma dan Struktur
Data 3” by Achmad Solichin (Universitas Budi Luhur)
 BFS Algorithm - https://www.programiz.com/dsa/graph-bfs

TERIMA KASIH
 Dr. Achmad Solichin, S.Kom., M.T.I.
 Fakultas Teknologi Informasi, Universitas Budi Luhur
 achmatim@gmail.com | Achmad.Solichin@budiluhur.ac.id
 http://achmatim.net

Breadth First Search (BFS) pada Graph

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