2023 PROGRAM REQUIREMENTS In this assignment you will implement three basic graph algorithms breadth first search depth first traversal and topological | Assignment Collections

Computer Science 2023 Coding

2023 PROGRAM REQUIREMENTS In this assignment you will implement three basic graph algorithms breadth first search depth first traversal and topological | Assignment Collections

PROGRAM REQUIREMENTS

In this assignment you will implement three basic graph algorithms: breadth-first search, depth-

first traversal, and topological sort. We are not providing any code template, but you must follow

the input and output formats specified below. Read carefully what you are required to do to

receive full credit and attempt the extra credit tasks only after you are done with the

requirements.

arbitrary size from a file (as long as there is enough memory available, your code must work: do

not assume a maximum number of vertices). The input format is as follows: one line per vertex,

the first element is the vertex id and the following numbers are the adjacent vertices. The input

file will always be a bunch of integers and white space. For example,

1 3 4

3 1 4

4 1 3

is a graph with four vertices, and three undirected edges: (1, 3), (1,4) and (3,4).

Then, implement three algorithms:

• Breadth-first search. Calculate the distance from vertex 1 to all other vertices using BFS.

Then, print all the vertices sorted by distance from vertex 1. Note that if the graph is

unconnected, some nodes may have distance ∞.

• Depth-first traversal. Calculate discovery and finish times using DFT. Then, print all the vertices sorted by discovery time.

Topological sort. Print the topological sort of the graph.

• Look carefully at the sample input and output files and follow the same format.

• When you look through vertices, visit them in increasing order.

Extra credit:

• Use BFS to determine whether a graph is connected. The input is a graph, and the output

is yes or no.

• Implement an algorithm to detect whether a graph has a cycle. The input is a graph, and

the output is yes or no.

• Design and implement an algorithm that takes as its input a graph ???? = (????, ????) and a

permutation of ????, and outputs whether the permutation of ???? is a topological sort of ????.

Your algorithm must run in Θ(|????| + |????|).

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