public void Add(T value, IHandle ihandle)
{
if (this.size == this.items.Length)
{
int capacity = (int)((this.items.Length * 200L) / 100L);
if (capacity < (this.items.Length + DEFAULT_CAPACITY))
{
capacity = this.items.Length + DEFAULT_CAPACITY;
}
Array.Resize(ref this.items, capacity);
}
Handle handle = null;
if (ihandle != null)
{
handle = ValidateHandle(ihandle);
handle.heap = this;
}
HeapItem item = new HeapItem(value, handle);
Set(item, this.size);
BubbleUp(this.size++);
}
public HeapItem[] TestItems()
{
var a = new HeapItem("item1", 1);
var b = new HeapItem("item2", 2);
return(new HeapItem[] { a, b });
}
private void Up(int index)
{
if (index == 0)
{
return;
}
int parentIndex = (index - 1) / 2;
HeapItem swap = _store[index];
if (_comparer.Compare(_store[parentIndex].Key, swap.Key) <= 0)
{
return;
}
while (true)
{
SwapIndices(parentIndex, index);
index = parentIndex;
if (index == 0)
{
break;
}
parentIndex = (index - 1) / 2;
if (_comparer.Compare(_store[parentIndex].Key, swap.Key) <= 0)
{
break;
}
}
InsertItem(ref swap, index);
}
private void itemSwap(int index0, int index1)
{
HeapItem item = _array[index0];
_array[index0] = _array[index1];
_array[index1] = item;
}
//시각화를 위한 부분 : RETURN pC.IsEmpty
public bool next(ref Bitmap visual, ref Graphics g, ref int[,] Vs, int width, int height)
{
if (pC.IsEmpty)
{
return(pC.IsEmpty);
}
HeapItem top_item = pC.DeleteItem();
int v = (int)top_item.Value;
//시각화
visualize(ref visual, ref g, ref Vs, width, height, v, -1, "힙(min-heap)에서 팝(POP)한 정점 " + v + "을 선택");
int cnt = W[v].Count;
for (int i = 0; i < cnt; i++)
{
int u = W[v][i].v;
visualize(ref visual, ref g, ref Vs, width, height, v, i, "선택한 정점 " + v + "와 연결된 정점 " + u + "탐색");
if (C[u] == -1 || C[u] > C[v] + W[v][i].w)
{
C[u] = C[v] + W[v][i].w;
pC.InsertItem(new HeapItem(C[u], u));
preV[u] = v;
//시각화
visualize(ref visual, ref g, ref Vs, width, height, v, i, "정점 " + u + "로 가는 최소 경로 갱신 및 힙(min-heap)에 삽입(PUSH)");
}
}
return(false);
}
private void BubbleDown(int index)
{
HeapItem item = this.items[index];
int current, child;
for (current = index, child = (2 * current) + 1;
current < this.size / 2;
current = child, child = (2 * current) + 1)
{
if ((child < this.size - 1) && this.comparison(this.items[child].value, this.items[child + 1].value) > 0)
{
++child;
}
if (this.comparison(this.items[child].value, item.value) >= 0)
{
break;
}
Set(this.items[child], current);
}
if (current != index)
{
Set(item, current);
++this.version;
}
}
private void GrowHeap()
{
Capacity = (Capacity * 2) + 1;
HeapItem[] newHeap = new HeapItem[Capacity];
System.Array.Copy(heap, 0, newHeap, 0, Count);
heap = newHeap;
}
public T Remove(IHandle ihandle)
{
Handle handle = ValidateThisHandle(ihandle);
HeapItem item = this.items[handle.index];
RemoveAt(handle.index);
return(item.value);
}
private void Set(HeapItem item, int index)
{
this.items[index] = item;
if (item.handle != null)
{
item.handle.index = index;
}
}
public void Push(HeapItem v)
{
if (Count >= heap.Length - 1)
{
throw new InvalidOperationException();
}
// Usually this would be the place so increase size of heap if needed, but it's pre-allocated.
heap[Count] = v;
SiftUp(Count++);
}
private static TestCaseData GenerateHeapTestCase(params int[] values)
{
var testCaseData = new HeapItem[values.Length];
for (var i = 0; i < values.Length; i++)
{
testCaseData[i] = new HeapItem(values[i]);
}
return(new TestCaseData(new[] { testCaseData }).SetName($"Values: {string.Join(", ", values)}"));
}
public void Add(T item, int priority)
{
var node = new HeapItem <T>(item, priority);
_items[_currentIndex] = node;
_indexes[_items[_currentIndex].Item] = _currentIndex;
PercolateUp(_currentIndex);
_currentIndex++;
}
public void Insert(TValue value, TKey key)
{
EnsureCapacity(Capacity + 1);
var item = new HeapItem(key, value);
_store[Count] = item;
Up(Count);
Count++;
}
int CompareCost(HeapItem a, HeapItem b)
{
if (a.Cost < b.Cost)
{
return(1);
}
if (a.Cost > b.Cost)
{
return(-1);
}
return(0);
}
public static HeapItem <int>[] ToHeap(this int[] array)
{
HeapItem <int>[] heap = new HeapItem <int> [array.Length];
for (int i = 0; i < array.Length; i++)
{
heap[i] = new HeapItem <int>();
heap[i].Prioridade = array[i];
heap[i].Value = array[i];
}
return(heap);
}
private void BubbleUp(int idx, HeapItem item)
{
int iParent = (idx - 1) / 2;
while (idx > 0 && heap[iParent].Priority < item.Priority)
{
heap[idx] = heap[iParent];
idx = iParent;
iParent = (idx - 1) / 2;
}
heap[idx] = item;
}
public T RemoveMin()
{
if (this.size == 0)
{
throw new InvalidOperationException("Heap is empty");
}
HeapItem item = this.items[0];
RemoveAt(0);
return(item.value);
}
private void BubbleUp(int index, HeapItem he)
{
int parent = Parent(index);
while (index > 0 && heap[parent].Priority < he.Priority)
{
heap[index] = heap[parent];
index = parent;
parent = Parent(index);
}
heap[index] = he;
}
/// <summary>
/// Creates an empty collection.
/// </summary>
/// <param name="maxAddress">maximum address allowed</param>
public AddressPriorityQueue(int maxAddress)
{
if (maxAddress < 0 || maxAddress > 0x7FFFFFFE)
{
throw new Exception("AddressPriorityQueue: Maximum capacity is 1<<31 addresses!");
}
this.maxAddress = maxAddress;
allocatedSize = 4 * (int)Math.Sqrt(maxAddress + 1); // good for addresses in a 2D-space
binaryHeap = new HeapItem[allocatedSize];
binaryHeapSize = 0;
states = new uint[maxAddress + 1];
lastTakenDistance = 0;
taken = 0;
}
public void Push(int item)
{
if (Size == capacity)
{
HeapItem[] extendedArray = new HeapItem[capacity * 2];
for (int i = 0; i < capacity; i++)
extendedArray[i] = items[i];
items = extendedArray;
capacity *= 2;
}
Size++;
items[Size - 1] = new HeapItem() { Value = item, OperationNumber = Operations};
SiftUp(Size - 1);
Operations++;
}
public void InserenaHeap(int valor, int prioridade)
{
HeapItem <int>[] novaHeap = new HeapItem <int> [H.Length + 1];
for (int i = 0; i < H.Length; i++)
{
novaHeap[i] = H[i];
}
novaHeap[H.Length] = new HeapItem <int>()
{
Value = valor, Prioridade = prioridade
};
H = novaHeap;
CorrigeHeapSubindo(novaHeap.Length - 1);
}
private void Down(int index)
{
if (Count == index + 1)
{
return;
}
int left = index * 2 + 1;
int right = left + 1;
HeapItem swap = _store[index];
while (right <= Count) // While the current node has children
{
var nLeft = _store[left];
var nRight = _store[right];
if (right == Count || _comparer.Compare(nLeft.Key, nRight.Key) < 0) // Only the left child exists or the left child is smaller
{
if (_comparer.Compare(swap.Key, nLeft.Key) <= 0)
{
break;
}
SwapIndices(left, index);
index = left;
left = index * 2 + 1;
right = left + 1;
}
else // Right child exists and is smaller
{
if (_comparer.Compare(swap.Key, nRight.Key) <= 0)
{
break;
}
SwapIndices(right, index);
index = right;
left = index * 2 + 1;
right = left + 1;
}
}
InsertItem(ref swap, index);
}
private void TrickleDown(int idx, HeapItem item)
{
int iChild = idx * 2 + 1;
while (iChild < count)
{
if (iChild + 1 < count &&
heap[iChild].Priority < heap[iChild + 1].Priority)
{
++iChild;
}
heap[idx] = heap[iChild];
idx = iChild;
iChild = idx * 2 + 1;
}
BubbleUp(idx, item);
}
public void RemoveDaHeap()
{
if (H.Length > 0)
{
H[0] = H[H.Length - 1];
CorrigeHeapDescendo(0);
}
HeapItem <int>[] novaHeap = new HeapItem <int> [H.Length - 1];
for (int i = 0; i < novaHeap.Length; i++)
{
novaHeap[i] = H[i];
}
H = novaHeap;
}
public void MaxHeap_Contains_False(HeapItem[] items)
{
//Create the heap and add the items.
var heap = new MaxHeap <HeapItem>(items.Length);
for (var i = 0; i < items.Length; i++)
{
heap.Add(items[i]);
}
//Create new items and check if contains returns false
for (var i = 0; i < items.Length; i++)
{
var item = new HeapItem(items[i].Value);
Assert.IsFalse(heap.Contains(item), $"Contains returned true for item {item}");
}
}
/// <summary>
/// Get and remove address with shortest offered distance.
/// </summary>
/// <param name="address">the address</param>
/// <param name="distance">the distance</param>
/// <returns>true if operation was successful, false for empty collection</returns>
public bool TakeClosest(out int address, out int distance)
{
if (binaryHeapSize == 0)
{
address = 0;
distance = 0;
return(false);
}
address = binaryHeap[0].address;
distance = binaryHeap[0].distance;
states[address] = (uint)distance | wasTakenFlag;
lastTakenDistance = distance;
taken++;
#region binary heap shrink algo
binaryHeapSize--;
if (binaryHeapSize > 0)
{
HeapItem last = binaryHeap[binaryHeapSize];
int index = 0;
int child = 1;
while (child < binaryHeapSize)
{
if (child < binaryHeapSize - 1 && binaryHeap[child].distance > binaryHeap[child + 1].distance)
{
child++; // right child instead of left
}
if (last.distance <= binaryHeap[child].distance)
{
break;
}
binaryHeap[index] = binaryHeap[child];
states[binaryHeap[index].address] = (uint)index + 1;
index = child;
child = 2 * child + 1;
}
binaryHeap[index] = last;
states[last.address] = (uint)index + 1;
}
#endregion
return(true);
}
private void TrickleDown(int index, HeapItem he)
{
int child = LeftChild(index);
while (child < Count)
{
if (child + 1 < Count && heap[child].Priority < heap[child + 1].Priority)
{
++child;
}
heap[index] = heap[child];
index = child;
child = LeftChild(index);
}
BubbleUp(index, he);
}
private bool BubbleUp(int index)
{
HeapItem item = this.items[index];
int current, parent;
for (current = index, parent = (current - 1) / 2;
(current > 0) && (this.comparison(this.items[parent].value, item.value)) > 0;
current = parent, parent = (current - 1) / 2)
{
Set(this.items[parent], current);
}
if (current != index)
{
Set(item, current);
++this.version;
return(true);
}
return(false);
}
public void InsertItem(HeapItem item)
{
if (_lastIndex + 1 == _capacity)
{
_capacity += 2;
Array.Resize(ref _array, _capacity);
}
_array[++_lastIndex] = item;
int currentPosition = _lastIndex;
int parentPosition = getParentIndex(currentPosition);
while (currentPosition > 0 && (_array[currentPosition].Ranking < _array[parentPosition].Ranking))
{
itemSwap(currentPosition, parentPosition);
currentPosition = parentPosition;
parentPosition = getParentIndex(currentPosition);
}
}
//다익스트라 알고리즘 작동
public void run()
{
while (!pC.IsEmpty)
{
HeapItem top_item = pC.DeleteItem();
int v = (int)top_item.Value;
int cnt = W[v].Count;
for (int i = 0; i < cnt; i++)
{
int u = W[v][i].v;
if (C[u] == -1 || C[u] > C[v] + W[v][i].w)
{
C[u] = C[v] + W[v][i].w;
pC.InsertItem(new HeapItem(C[u], u));
preV[u] = v;
//pC.PrintHeap();
}
}
}
}
public void EnsureCapacity(int capacity)
{
if (_store.Length >= capacity)
{
return;
}
//double capacity until we reach the minimum requested capacity (or greater)
int newcap = Capacity * 2;
while (newcap < capacity)
{
newcap *= 2;
}
var newArray = new HeapItem[newcap];
Array.Copy(_store, newArray, Capacity);
_store = newArray;
Capacity = newcap;
}
