// Complete the roadsAndLibraries function below.
static long roadsAndLibraries(int n, int c_lib, int c_road, int[][] cities)
{
if (c_road > c_lib)
{
return(n * c_lib);
}
var gragh = new Gragh(n, false);
for (int i = 0; i < cities.Length; i++)
{
gragh.AddEdge(cities[i][0], cities[i][1]);
}
return(DFS(gragh, c_lib, c_road));
}
private static long DFS(Gragh gragh, int c_lib, int c_road)
{
var visited = new bool[gragh.CitiesCount + 1];
long cost = 0;
for (int i = 1; i <= gragh.CitiesCount; i++)
{
if (!visited[i])
{
var routesCount = DFSUtil(gragh, visited, i);
cost += (routesCount - 1) * c_road + c_lib;
}
}
return(cost);
}
// Complete the findShortest function below.
/*
* For the unweighted graph, <name>:
*
* 1. The number of nodes is <name>Nodes.
* 2. The number of edges is <name>Edges.
* 3. An edge exists between <name>From[i] to <name>To[i].
*
*/
static int findShortest(int graphNodes, int[] graphFrom, int[] graphTo, long[] colors, int val)
{
// solve here
var gragh = new Gragh(graphNodes, false);
for (int i = 0; i < graphFrom.Length; i++)
{
gragh.AddEdge(new Vertix(graphFrom[i], colors[graphFrom[i] - 1]), new Vertix(graphTo[i], colors[graphTo[i] - 1]));
}
var visited = new HashSet <Vertix>(new EqualityComparer());
var q = new Queue <Tuple <int, Vertix> >();
foreach (var vertixKV in gragh.VertixesWithEdges)
{
var parentVertix = vertixKV.Key;
//if (!visited.Contains(parentVertix))
{
visited.Add(parentVertix);
if (parentVertix.Color == val)
{
var path = 0;
q.Enqueue(new Tuple <int, Vertix>(0, parentVertix));
while (q.Count > 0)
{
var qItem = q.Dequeue();
// BFS
foreach (var child in gragh.VertixesWithEdges[qItem.Item2])
{
if (!visited.Contains(child))
{
q.Enqueue(new Tuple <int, Vertix>(qItem.Item1 + 1, child));
if (child.Color == val)
{
return(qItem.Item1 + 1);
}
}
}
}
}
}
}
return(-1);
}
private static int DFSUtil(Gragh gragh, bool[] visited, int vertix)
{
int routesCount = 1;
visited[vertix] = true;
if (gragh.VertixesWithEdges.ContainsKey(vertix))
{
foreach (var edge in gragh.VertixesWithEdges[vertix])
{
if (!visited[edge])
{
routesCount += DFSUtil(gragh, visited, edge);
}
}
}
return(routesCount);
}
