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authorPixel <>2001-03-03 22:53:41 +0000
committerPixel <>2001-03-03 22:53:41 +0000
commitdc2ce18ea8e1686e61dce2b924e3607df69a2dcf (patch)
treef035493abaca3227da9bbae2b628afbeb990759c /lib/BinHeap.cc
parent833d20a69fe17ab846c153e35230c66a41d8fca9 (diff)
Plein de changements
Diffstat (limited to 'lib/BinHeap.cc')
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diff --git a/lib/BinHeap.cc b/lib/BinHeap.cc
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+++ b/lib/BinHeap.cc
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+#include <stdio.h>
+#include <stdlib.h>
+#include "config.h"
+#include "BinHeap.h"
+
+#define FATHER(i) (i >> 2)
+#define LEFT(i) (i << 2)
+#define RIGHT(i) ((i <<2) + 1)
+
+/**********************************\
+* *
+* Tas binaires *
+* *
+\**********************************/
+
+
+ /*
+ * Implémentation quasi directe de l'algorithme Entasser(A, i) avec A = this.
+ * Seul le test de condition est inversé.
+ */
+
+void BinHeap::PackUp(int i)
+{
+ int l = LEFT(i), r = RIGHT(i), min;
+ binheap_t *binheap = (binheap_t *) Datas;
+
+ cerr << "Appel à PackUp(" << i << ")" << endl;
+
+ min = ((l <= Key) && (binheap[l - 1].Key < binheap[i - 1].Key)) ? l : i;
+ if ((r <= Key) && (binheap[r - 1].Key < binheap[min - 1].Key))
+ min = r;
+ if (min != i) {
+ SWAP(binheap[i - 1], binheap[min - 1]);
+ PackUp(min);
+ }
+}
+
+ /*
+ * Il n'y a aucune méthode "rapide" pour effectuer l'union de deux tas
+ * binaires. Nous utiliserons donc l'union générique.
+ */
+
+PriorityList *BinHeap::Union(PriorityList * P)
+{
+ return GenericUnion(P);
+}
+
+
+ /*
+ * Comme pour l'Union, nous allons devoir utiliser une méthode lente pour
+ * effectuer le diminuer clef (voir rapport)
+ */
+
+bool BinHeap::Lower_Key(Cell x, Key_t NKey)
+{
+ Datas_t Datas;
+ Key_t Key;
+
+ Key = Delete(Datas, x);
+ Insert(Key, Datas);
+ return true;
+}
+
+BinHeap::BinHeap(void)
+{
+ Key = 0;
+ Datas = NULL;
+}
+
+BinHeap::~BinHeap(void)
+{
+ if (Datas)
+ free(Datas);
+}
+
+Key_t BinHeap::ReadKey(Cell C)
+{
+ return ((binheap_t *) C)->Key;
+}
+
+Datas_t BinHeap::ReadDatas(Cell C)
+{
+ return ((binheap_t *) C)->Datas;
+}
+
+int BinHeap::rn(void)
+{
+ return n();
+}
+
+void BinHeap::Dump(ostream & os)
+{
+ int i;
+ binheap_t *binheap = (binheap_t *) Datas;
+
+ for (i = 0; i < Key; i++) {
+ os << binheap[i].Key << " ";
+ }
+ os << endl;
+}
+
+bool BinHeap::IsEmpty(void)
+{
+ return (Key == 0);
+}
+
+Cell BinHeap::Min(void)
+{
+ return Datas;
+}
+
+Cell BinHeap::Insert(Key_t IKey, Datas_t const &IDatas)
+{
+ binheap_t newcell = { IKey, IDatas }, *binheap;
+ int i = Key++;
+
+ if (!Datas || ((((Key >> GRANUL) + 1) << GRANUL) != (((i >> GRANUL) + 1) << GRANUL))) {
+ cerr << "Reallocating " << (((Key >> GRANUL) + 1) << GRANUL) << " entries" << endl;
+ if (!(Datas = realloc(Datas, (((Key >> GRANUL) + 1) << GRANUL) * sizeof(binheap_t)))) {
+ exception(5, _("Not enough memory"));
+ }
+ }
+ i = Key;
+
+ binheap = (binheap_t *) Datas;
+
+ while ((i > 1) && (binheap[FATHER(i) - 1].Key > IKey)) {
+ binheap[i - 1] = binheap[FATHER(i) - 1];
+ i = FATHER(i);
+ }
+ binheap[i - 1] = newcell;
+
+ return &(binheap[i - 1]);
+}
+
+
+ /*
+ * Implémentation directe de l'algorithme EXTRAIRE-MIN-TAS(A) avec A = this.
+ */
+
+Key_t BinHeap::Extract_Min(Datas_t & Datas)
+{
+ binheap_t *binheap = (binheap_t *) Datas;
+ Key_t ret;
+
+ if (Key < 1)
+ exception(5, _("negative overflow"));
+
+
+ ret = binheap[0].Key;
+ Datas = binheap[0].Datas;
+ binheap[0] = binheap[Key - 1];
+
+ int i = Key--;
+
+ if (!Datas || ((((Key >> GRANUL) + 1) << GRANUL) != (((i >> GRANUL) + 1) << GRANUL))) {
+ cerr << "Reallocating " << (((Key >> GRANUL) + 1) << GRANUL) << " entries" << endl;
+ Datas = realloc(Datas, (((Key >> GRANUL) + 1) << GRANUL) * sizeof(binheap_t));
+ }
+ PackUp(1);
+ return ret;
+}
+
+
+ /*
+ * Implémentation directe de l'algorithme TAS-BINOMIAL-SUPPRIMER(T,x) avec T = this.
+ * La valeur de la clef supprimée est renvoyée par la routine et les données satellites
+ * sont écrites dans la variable Datas.
+ */
+
+Key_t BinHeap::Delete(Datas_t & Datas, Cell x)
+{
+ Key_t K;
+
+ K = ReadKey(x);
+ Lower_Key(x, M_INFINITY);
+ Extract_Min(Datas);
+
+ return K;
+}