FLowNetwork

to use clone the repo and then build your graph in a text file in the following format:

num_vertices num_edges
from -> to N where N is the capacity of the edge

8 15
0 1 10
0 3 5
0 5 15
1 2 9
1 3 4
1 4 15
2 4 15
2 7 10
3 4 8
3 5 4
4 6 15
4 7 10
5 6 16
6 3 6
6 7 10

file saved as test2.txt for example below

Sample code to read a graph from a file

int main() {
    // open a file and use istream to read the data
    std::ifstream in("test2.txt");
    std::istream &is = in;
    // create a graph
    FlowNetwork flowNetwork(is, 0, 7);

    FordFulkerson fordFulkerson(flowNetwork);
    cout << fordFulkerson << endl;

    return EXIT_SUCCESS;
}

output

*** Flow is optimal ***
Max flow from 0 to 7
(0->5 13/15) (0->3 5/5) (0->1 10/10) (1->4 2/15) (1->2 8/9) (2->7 8/10)
(3->4 8/8) (4->7 10/10) (5->6 13/16) (6->7 10/10) (6->3 3/6)

Min s-t cut:
(0 - 1), (3 - 4), (6 - 7)

Max flow value = 28.000000

Sample code to build a random graph

int main() {
    // make a random flow network of 15 vertices and 40 edges
    FlowNetwork flowNetwork1(15, 40, 0, 14);

    FordFulkerson fordFulkerson1(flowNetwork1);
    cout << fordFulkerson1 << endl;

    return EXIT_SUCCESS;
}

output

*** Flow is optimal ***
Max flow from 0 to 14
(0->8 56/58) (0->7 36/66) (6->14 14/14) (6->11 27/76) (7->11 36/36) (8->6 41/98)
(8->14 15/15) (11->14 63/63)

Min s-t cut:
(6 - 14), (8 - 14), (11 - 14)

Max flow value = 92.000000