T value(size_type index) const {
FFASSERT( index >= 0 && index < (size_type)d_.size() );
if (0 == index)
return d_[0];
T prob = d_[index];
size_type index_parent = parent_index(index);
--index;
while (index_parent != index) {
prob = fun_rev_(prob, d_[index]);
index = parent_index(index);
}
return prob;
}
void heapify(std::vector<int>* array) {
for (auto itr = array->begin();
itr != array->end();
++itr) {
auto index = itr - array->begin();
auto parent = parent_index(index);
while (index != parent
&& (*array)[parent] < (*array)[index]) {
std::swap((*array)[parent], (*array)[index]);
index = parent;
parent = parent_index(index);
}
}
}
/// Dijkstraµ¥Ô´×î¶Ì·¾¶Ëã·¨
void testDijkstra()
{
cout << "Dijkstra×î¶Ì·¾¶" << endl;
//Éú³ÉP367Ò³µÄͼ24-6
vector<char> v;
v.push_back( 's' );
v.push_back( 't' );
v.push_back( 'x' );
v.push_back( 'z' );
v.push_back( 'y' );
GraphicsViaAdjacencyList<char> g( v, Digraph );
g.Link2Vertex( 0, 1, 10 );
g.Link2Vertex( 0, 4, 5 );
g.Link2Vertex( 1, 2, 1 );
g.Link2Vertex( 1, 4, 2 );
g.Link2Vertex( 2, 3, 4 );
g.Link2Vertex( 3, 2, 6 );
g.Link2Vertex( 3, 0, 7 );
g.Link2Vertex( 4, 1, 3 );
g.Link2Vertex( 4, 2, 9 );
g.Link2Vertex( 4, 3, 2 );
int start_index = 0;
vector<int> d( g.GetVertex().size() );
vector<int> parent_index( g.GetVertex().size() );
Dijkstra( g, start_index, d, parent_index );
for ( size_t i = 0; i < g.GetVertex().size(); ++i )
{
cout << g.GetVertex()[i] << " | " << d[i] << endl;
}
}
void p_queue::push(const value_type& entry, size_type priority)
{
if(capacity <= used)
{
size_type newCapacity = 1 + (capacity * 1.25);
resize(newCapacity);
}
ItemType newItem;
newItem.data = entry;
newItem.priority = priority;
size_type newItemIndex = used;
heap[newItemIndex] = newItem;
++used;
while(newItemIndex != 0)
{
size_type parentIndex = parent_index(newItemIndex);
if(priority <= heap[parentIndex].priority)
{
return;
}
else
{
swap_with_parent(newItemIndex);
newItemIndex = parentIndex;
}
}
}
T accumulate(size_type i) const {
FFASSERT( i >= 0 && i < (size_type)d_.size() );
T ret = d_[0];
while (i > 0) {
ret = fun_(ret, d_[i]);
i = parent_index(i);
}
return ret;
}
p_queue::size_type
p_queue::parent_priority(size_type i) const
// Pre: (i > 0) && (i < used)
// Post: The priority of "the parent of the item at heap[i]" has
// been returned.
{
assert(i > 0 && i < used);
return heap[parent_index(i)].priority;
}
static status siftup(heap * const p_H,
size_t const index)
{
if (index == 0)
return OK;
{
size_t parent;
if (parent_index(index, &parent) == ERROR)
return ERROR;
if ((*(p_H -> p_cmp_f))(p_H -> base[index], p_H -> base[parent]) >= 0)
return OK;
swap(p_H, index, parent);
return siftup(p_H, parent);
}
}
void MPILock::initialize_sides() {
sides.reserve(tree_rank + 2);
sides.push_back(index);
sides.push_back(index);
sides[SIDE_INDEX_PARENT] = parent_index();
for (unsigned child_num = 1, child_index = tree_rank * index + child_num;
(child_num <= tree_rank) && (child_index < size);
(child_num += 1), (child_index += 1) ) {
sides.push_back(child_index);
}
if (DEBUG) {
printf("#%u: sides(%lu) ", index, sides.size());
printf("PARENT: % 3d,\t", sides[SIDE_INDEX_PARENT]);
printf("SELF: % 3d", sides[SIDE_INDEX_SELF]);
if (sides.size() > SIDE_INDEX_FIRST_CHILD) {
printf(",\t{% 2d", sides[SIDE_INDEX_FIRST_CHILD]);
for (unsigned i = SIDE_INDEX_FIRST_CHILD + 1; i < sides.size(); ++i) printf(", % 2d", sides[i]);
printf(" }");
}
printf("\n");
}
}
