Design a program which constructs a graph from values read from a text file. Assume the text

file contains $1,000$ lines of data. Each line represents one node in the graph, starting with the

node's ID and followed by the ID of all connected nodes $($edges$).$

$E.g.1,2,5$

$2,3,5$

$3,4$

$4,3$

$5,1$