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skip list update

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This commit is contained in:
enqidu 2020-07-07 18:16:38 +04:00
parent dcdebae395
commit f7ab869d90
1 changed files with 6 additions and 11 deletions
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17
data_structures/skip_list.cpp
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@ -7,25 +7,22 @@
#include <iostream> #include <iostream>
#include <vector> #include <vector>
#include <stdio.h>
#include <string.h> #include <string.h>
#include <stdlib.h> #include <stdlib.h>
#include <time.h> #include <time.h>
#include <cstdlib>
// using namespace std; // using namespace std;
using std::vector; using std::vector;
using std::endl; using std::endl;
#define MAXLVL 2 #define MAXLVL 2 ///< maximum level of skip list
#define P 0.5 #define P 0.5 ///< current probability for "coin toss"
/** /**
* Node structure [Key][Node*, Node*...] * Node structure [Key][Node*, Node*...]
*/ */
class Node { struct Node {
public:
int key; int key;
void* value; void* value;
/*Forward Array*/ /*Forward Array*/
@ -38,7 +35,7 @@ Node::Node(int key, int level, void* value) {
this->key = key; this->key = key;
/*Initialization of forward vector*/ /*Initialization of forward vector*/
for (int i = 0; i < sizeof(Node*)*(level+1); i++){ for (int i = 0; i < (level+1); i++){
forward.push_back(NULL); forward.push_back(NULL);
} }
} }
@ -67,7 +64,6 @@ SkipList::SkipList() {
SkipList::~SkipList(){ SkipList::~SkipList(){
delete header;
for(int i=0; i <= level; i++) { for(int i=0; i <= level; i++) {
Node *node = header->forward[i]; Node *node = header->forward[i];
Node* temp; Node* temp;
@ -77,6 +73,7 @@ SkipList::~SkipList(){
delete temp; delete temp;
} }
} }
delete header;
} }
@ -201,12 +198,10 @@ int main()
SkipList lst; SkipList lst;
for (int j = 0; j < (1 << (MAXLVL+1)); j++){ for (int j = 0; j < (1 << (MAXLVL+1)); j++){
int k = (std::rand()% (1 << (MAXLVL+1) + 1)); int k = (std::rand()%( 1 << (MAXLVL+2)) + 1);
lst.insertElement(k, &j); lst.insertElement(k, &j);
} }
lst.displayList(); lst.displayList();
} }