//Kruskal’s Minimum Spanning Tree (MST)
void Graph::krusMST() {
vector<pair< int, pair<int,int> > > ls;
//sort all the edge
//input the beginning vertex,end vertex, distance from the private list<int,int> adj
list<pair<int,int> >::iterator it;
for(int i=0;i<nVert;i++) {
for(it=adj[i].begin();it!=adj[i].end();++it) {
ls.push_back(make_pair((*it).second,make_pair(i,(*it).first)));
}
}
sort(ls.begin(),ls.end());
vector<pair< int, pair<int,int> > >::iterator it2=ls.begin();
int weight=0;//weight of the tree
set<int> s;
//Get the minimum spanning tree
cout<<"The minimum spanning tree: "<<endl;
for(;it2!=ls.end();++it2) {
//Determine create circle or not
if(!isCycle((*it2).second.first,(*it2).second.second)) {
weight+=(*it2).first;
s.insert((*it2).second.first);
s.insert((*it2).second.second);
cout<<name[(*it2).second.first]<<" --- "<<name[(*it2).second.second];
cout<<" "<<(*it2).first<<endl;
}
}
cout<<"Weight: "<<weight<<endl;
}
/* =============================================================================
* isCycle
* =============================================================================
*/
static bool_t
isCycle (vector_t* nodeVectorPtr, net_node_t* nodePtr)
{
switch (nodePtr->mark) {
case NET_NODE_MARK_INIT: {
nodePtr->mark = NET_NODE_MARK_TEST;
list_t* childIdListPtr = nodePtr->childIdListPtr;
list_iter_t it;
list_iter_reset(&it, childIdListPtr);
while (list_iter_hasNext(&it, childIdListPtr)) {
long childId = (long)list_iter_next(&it, childIdListPtr);
net_node_t* childNodePtr =
(net_node_t*)vector_at(nodeVectorPtr, childId);
if (isCycle(nodeVectorPtr, childNodePtr)) {
return TRUE;
}
}
break;
}
case NET_NODE_MARK_TEST:
return TRUE;
case NET_NODE_MARK_DONE:
return FALSE;
break;
default:
assert(0);
}
nodePtr->mark = NET_NODE_MARK_DONE;
return FALSE;
}
/* =============================================================================
* net_isCycle
* =============================================================================
*/
bool_t
net_isCycle (net_t* netPtr)
{
vector_t* nodeVectorPtr = netPtr->nodeVectorPtr;
long numNode = vector_getSize(nodeVectorPtr);
long n;
for (n = 0; n < numNode; n++) {
net_node_t* nodePtr = (net_node_t*)vector_at(nodeVectorPtr, n);
nodePtr->mark = NET_NODE_MARK_INIT;
}
for (n = 0; n < numNode; n++) {
net_node_t* nodePtr = (net_node_t*)vector_at(nodeVectorPtr, n);
switch (nodePtr->mark) {
case NET_NODE_MARK_INIT:
if (isCycle(nodeVectorPtr, nodePtr)) {
return TRUE;
}
break;
case NET_NODE_MARK_DONE:
/* do nothing */
break;
case NET_NODE_MARK_TEST:
assert(0);
break;
default:
assert(0);
break;
}
}
return FALSE;
}
// Driver program to test above functions
int main()
{
/* Let us create following graph
0
| \
| \
1-----2 */
int V = 3, E = 3;
struct Graph* graph = createGraph(V, E);
// add edge 0-1
graph->edge[0].src = 0;
graph->edge[0].dest = 1;
// add edge 1-2
graph->edge[1].src = 1;
graph->edge[1].dest = 2;
// add edge 0-2
graph->edge[2].src = 0;
graph->edge[2].dest = 2;
if (isCycle(graph))
printf( "graph contains cycle" );
else
printf( "graph doesn't contain cycle" );
return 0;
}
void isCycle(Node const& n, VisitedNodes& stack) {
if (stack.find(n.getPath()) != stack.cend()) {
LOG(INFO) << "loop";
Exception e(__func__, __FILE__, __LINE__, EINVAL, "LOOP DETECTED IN GRAPH");
std::string message = " +-> " + n.getPath();
throw Exception(e.getErrorMessage(),
__func__, __FILE__, __LINE__,
e.getCode(), message.c_str());
}
Rule const* child = n.getChild();
if (child == nullptr) {
return;
}
auto pos = stack.insert(n.getPath());
NodeArray const& inputs = child->getInputs();
for (auto it = inputs.cbegin(); it != inputs.cend(); it++) {
try {
isCycle(**it, stack);
} catch (Exception& e) {
std::string message = " | "+ n.getPath();
throw Exception(e.getErrorMessage(), __func__, __FILE__, __LINE__,
e.getCode(), message.c_str());
}
}
stack.erase(pos.first);
}
void checkGraphLoop(Graph const& g) {
NodeSet const& roots = g.getRoots();
for (auto it = roots.cbegin(); it != roots.cend(); it++) {
VisitedNodes stack;
isCycle(**it, stack);
}
}
// Driver program to test above functions
int main()
{
/* Let us create following graph
0
| \
| \
1-----2 */
int V = 10, E = 9;
struct Graph* graph = createGraph(V, E);
// add edge 0-1
graph->edge[0].src = 3;
graph->edge[0].dest = 1;
// add edge 1-2
graph->edge[1].src = 3;
graph->edge[1].dest = 2;
// add edge 0-2
graph->edge[2].src = 4;
graph->edge[2].dest = 0;
graph->edge[3].src = 4;
graph->edge[3].dest = 3;
graph->edge[4].src = 6;
graph->edge[4].dest = 7;
graph->edge[5].src = 6;
graph->edge[5].dest = 8;
graph->edge[6].src = 9;
graph->edge[6].dest = 5;
graph->edge[7].src = 9;
graph->edge[7].dest = 6;
graph->edge[8].src = 9;
graph->edge[8].dest = 4;
if (isCycle(graph))
printf( "Graph contains cycle" );
else
printf( "Graph doesn't contain cycle" );
return 0;
}
short ElemDDLSGOptions::genSGA(SequenceGeneratorAttributes &sga)
{
sga.setSGStartValue(getStartValue());
sga.setSGIncrement(getIncrement());
sga.setSGMinValue(getMinValue());
sga.setSGMaxValue(getMaxValue());
sga.setSGCache(getCache());
sga.setSGCycleOption(isCycle());
sga.setSGFSDataType(getFSDataType());
sga.setSGResetOption(isReset());
return 0;
}
void map(void)
{
int i, j, c;
uint16_t f1, f2;
bool cycle;
uint8_t *keys;
c = 0;
do {
initGraph();
cycle = false;
// Randomly generate T1 and T2
for (i = 0; i < SetSize * EntryLen; i++) {
T1base[i] = rand() % NumVert;
T2base[i] = rand() % NumVert;
}
for (i = 0; i < NumEntry; i++) {
f1 = 0;
f2 = 0;
getKey(i, &keys);
for (j = 0; j < EntryLen; j++) {
T1 = T1base + j * SetSize;
T2 = T2base + j * SetSize;
f1 += T1[keys[j] - SetMin];
f2 += T2[keys[j] - SetMin];
}
f1 %= (uint16_t)NumVert;
f2 %= (uint16_t)NumVert;
if (f1 == f2) { // A self loop. Reject!
printf("Self loop on vertex %d!\n", f1);
cycle = true;
break;
}
addToGraph(numEdges++, f1, f2);
}
if (cycle || (cycle = isCycle())) // OK - is there a cycle?
printf("Iteration %d\n", ++c);
else
break;
} while (/* there is a cycle */ 1);
}
// Driver program to test above functions
int main()
{
/* Let us create following graph
0
| \
| \
1-----2 */
struct Graph* graph = createGraph(6, 6);
// add edge 0-1
graph->edge[0].src = 0;
graph->edge[0].dest = 1;
// add edge 1-2
graph->edge[1].src = 1;
graph->edge[1].dest = 2;
// add edge 1-4
graph->edge[2].src = 1;
graph->edge[2].dest = 4;
// add edge 2-3
graph->edge[3].src = 2;
graph->edge[3].dest = 3;
// add edge 3-2
graph->edge[4].src = 3;
graph->edge[4].dest = 2;
// add edge 4-5
graph->edge[5].src = 4;
graph->edge[5].dest = 5;
if (isCycle(graph))
printf( "Graph contains cycle" );
else
printf( "Graph doesn't contain cycle" );
return 0;
}