void Graph::dijkstra_shortest_path(int root, bool isTerminateAsFound){
//<length nodeid > tricky nodes[i]为节点i在heap中的指针
MinBinaryHeap<int, int > q; //优先队列
vector <BinaryHeapNode<int, int >*> nodes(n);
int min,w; //min 最小权值对应的节点id, w为与min相连的节点id
for (int i = 0; i < n; ++i){
distance[i] = POSTIVE_MAXINT; parent[i] = -1;
if ( i == root ) { distance[i] = 0; parent[i] = i; }
nodes[i] = q.insert(distance[i],i);
}
while(!q.empty()){
min = q.minimum()->data();
if (isTerminateAsFound && min==dest){ //必须等到dest出优先队列才能结束，因为以后都不可能对其松弛
break;
}
if (q.minimum()->key() == POSTIVE_MAXINT){ break; } //后面的都是其他森林，不需要遍历
q.removeMinimum(); nodes[min] = NULL;
//开始更新和u相连的边 relax
list<Node>::iterator itr = linktable[min].begin();
while(itr != linktable[min].end()){
w = itr->id;
if (nodes[w] != NULL) //未被选中加入S
{
if (distance[min]+itr->weight < distance[w]) //relax
{
q.decreaseKey(nodes[w], distance[min]+itr->weight);
distance[w] = distance[min]+itr->weight;
parent[w] = min;
}
}
++itr;
}
}
}
void Graph::dijkstra_without_pass_other_mustpass_nodes(int root){
//<length nodeid > tricky nodes[i]为节点i在heap中的指针
MinBinaryHeap<int, int > q; //优先队列
vector <BinaryHeapNode<int, int >*> nodes(n);
int min,w; //min 最小权值对应的节点id, w为与min相连的节点id
for (int i = 0; i < n; ++i){
distance[i] = POSTIVE_MAXINT; parent[i] = -1;
if ( i == root ) { distance[i] = 0; parent[i] = i; }
nodes[i] = q.insert(distance[i],i);
}
while(!q.empty()){
min = q.minimum()->data();
// if (min==end) break; //必须等到end出优先队列才能结束，因为以后都不可能对其松弛
if (q.minimum()->key() == POSTIVE_MAXINT){ break; } //后面的都是其他森林，不需要遍历
q.removeMinimum(); nodes[min] = NULL;
//除root以外其他必过节点成为黑洞，没有出边,不帮助松弛
if ((min != root )&&(allmustpass.find(min) != allmustpass.end())) continue;
//开始更新和u相连的边 relax
list<Node>::iterator itr = linktable[min].begin();
while(itr != linktable[min].end()){
w = itr->id;
if (nodes[w] != NULL){ //未被选中加入S
if (distance[min]+itr->weight < distance[w]){ //relax
q.decreaseKey(nodes[w], distance[min]+itr->weight);
distance[w] = distance[min]+itr->weight;
parent[w] = min;
}
}
++itr;
}
}
}
