a graph consists of vertices and edges that connect vertices.
a graph consists of vertices and edges that connect vertices. write a program that reads a graph from a file and displays it on a panel. the first line in the file contains a number that indicates the number of vertices (n). the vertices are labeled as 0, 1, ..., n-1. each subsequent line, with the format u x y v1, v2, ..., describes that the vertex u is located at position (x, y) with the edges (u, v1), (u, v2), and so on. figure 13.12a gives an example of the file for a graph. your program prompts the user to enter the name of the file, reads data from the file, and displays the graph on a panel, as shown in figure 13.12b.
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