static void DestroyMinimumCut(ref NetworkGraph graph, bool isDynamic, StreamWriter write)
{
// get the minimum cut and sort it by highest flow.
List <NetworkLink> minCut = FindMinimumCut(graph.source);
int halfFlowTime = -1;
int totalFlowMaximum = graph.maxFlow;
// Console.WriteLine("Beginning 'DestroyMinimumCut()'.");
int t = 0;
while (graph.maxFlow != 0)
{
minCut.Sort((x, y) => - x.flow.CompareTo(y.flow));
graph.DestroyLink(minCut[0]);
if (isDynamic)
{
graph.FillGraph();
}
if (halfFlowTime == -1 && graph.maxFlow < 0.5f * totalFlowMaximum)
{
halfFlowTime = t;
}
PrintGraphInfo(graph, t, write);
t++;
}
Console.WriteLine("'DestroyMinimumCut()' complete. \t|Max flow: " + graph.maxFlow + " \t|Half flow time: " + halfFlowTime);
write.WriteLine("MaxFlow: " + graph.maxFlow + " Half flow time: " + halfFlowTime + "\n");
}
static void Main(string[] args)
{
StreamWriter outputRandom = new StreamWriter("output_random.txt");
StreamWriter outputHighestFlow = new StreamWriter("output_highestflow.txt");
StreamWriter outputMincut = new StreamWriter("output_mincut.txt");
// number of links between source and graph, and graph and target
for (int K = 30; K <= 60; K++)
{
int seed = DateTime.Now.Millisecond;
Console.WriteLine("\t|K = " + K + " |SEED: " + seed);
outputRandom.WriteLine("\t|K = " + K);
outputHighestFlow.WriteLine("\t|K = " + K);
outputMincut.WriteLine("\t|K = " + K);
for (int j = 0; j < 2; j++)
{
Console.WriteLine(j == 1 ? "\tDynamic" : "\tStatic");
for (int i = 0; i < 3; i++)
{
// build the graph using the file provided in the project description.
NetworkGraph graph = new NetworkGraph(GRAPH_FILE, VERTEX_COUNT, EDGE_COUNT, MIN_CAPACITY, MAX_CAPACITY, K, seed);
// fill the graph's flow to achieve the max flow.
graph.FillGraph();
// i = 0: Random Destruction
// i = 1: Planned Destruction
// j = 0: Static Routing
// j = 1: Dynamic routing
if (i == 0)
{
outputRandom.WriteLine(j == 1 ? "Dynamic" : "Static");
DestroyAtRandom(ref graph, j == 1, outputRandom, seed + K);
}
else if (i == 1)
{
outputHighestFlow.WriteLine(j == 1 ? "Dynamic" : "Static");
DestroyHighestFlowing(ref graph, j == 1, outputHighestFlow);
}
else
{
outputMincut.WriteLine(j == 1 ? "Dynamic" : "Static");
DestroyMinimumCut(ref graph, j == 1, outputMincut);
}
}
}
}
outputRandom.Flush();
outputHighestFlow.Flush();
outputMincut.Flush();
// pause so i can read the output.
Console.ReadLine();
}
static void DestroyHighestFlowing(ref NetworkGraph graph, bool isDynamic, StreamWriter write)
{
// get the list of all edges and sort it by maximum flow.
List <NetworkLink> edges = new List <NetworkLink>();
for (int i = 0; i < EDGE_COUNT; i++)
{
edges.Add(graph.edges[i]);
}
edges.Sort((x, y) => - x.flow.CompareTo(y.flow));
int halfFlowTime = -1;
int totalFlowMaximum = graph.maxFlow;
// Console.WriteLine("Beginning 'DestroyHighestFlowing()'");
// destroy each edge in order.
int t = 0;
int j = 0;
while (graph.maxFlow > 0)
{
if (!isDynamic)
{
while (edges[j].flow == 0)
{
j++;
}
}
graph.DestroyLink(edges[j]);
if (halfFlowTime == -1 && graph.maxFlow < 0.5f * totalFlowMaximum)
{
halfFlowTime = t;
}
if (isDynamic)
{
graph.FillGraph();
edges.Sort((x, y) => - x.flow.CompareTo(y.flow));
}
else
{
j++;
}
PrintGraphInfo(graph, t, write);
t++;
}
Console.WriteLine("'DestroyHighestFlowing()' complete. \t|Max flow: " + graph.maxFlow + " \t|Half flow time: " + halfFlowTime);
write.WriteLine("MaxFlow: " + graph.maxFlow + " Half flow time: " + halfFlowTime + "\n");
}
static void DestroyAtRandom(ref NetworkGraph graph, bool isDynamic, StreamWriter write, int seed)
{
// set up a list containing the indeces of the possible-to-destroy edges.
List <int> choices = new List <int>(EDGE_COUNT);
for (int i = 0; i < EDGE_COUNT; i++)
{
choices.Add(i);
}
int count = choices.Count;
int halfFlowTime = -1;
int totalFlowMaximum = graph.maxFlow;
// Console.WriteLine("Beginning 'DestroyAtRandom()'");
// loop until the maximum flow has been reduced to 0.
int t = 1;
while (graph.maxFlow != 0)
{
// get a random number from 0 to the number of possible edge choices
Random random = new Random(seed);
int rand = random.Next(0, count);
// select the int at that index as the chosen index of the edge to destroy
int choice = choices[rand];
// 'delete' the element that we chose (move the last element to the index that we chose, then reduce the count)
choices[rand] = choices[count - 1];
count--;
// destroy the link, updating the other nodes in the graph as needed.
graph.DestroyLink(graph.edges[choice]);
// if the routing method is 'dynamic', then recalculate the flow path.
if (isDynamic)
{
graph.FillGraph();
}
if (halfFlowTime == -1 && graph.maxFlow < 0.5f * totalFlowMaximum)
{
halfFlowTime = t;
}
PrintGraphInfo(graph, t, write);
t++;
}
Console.WriteLine("'DestroyAtRandom()' complete. \t\t|Max flow: " + graph.maxFlow + " \t|Half flow time: " + halfFlowTime);
write.WriteLine("MaxFlow: " + graph.maxFlow + " Half flow time: " + halfFlowTime + "\n");
}