Add Hash Table data structures
mohanadtalat91
parent
aeee10f2f0
commit
a97e6c2249
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@ -0,0 +1,125 @@
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# Hash Table
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- Implementation of Hash Table with different hashing functions, Implement two ways to solve colliosion :
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- [x] Chaining
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- [x] Linear Probing
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#include "entity.h"
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#include "LinearProbing.h"
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#include <iostream>
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#include <string>
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LinearProbing::LinearProbing(int length_) {
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actual_length = 0 ;
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length = length_ ;
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contacts.resize(length_) ;
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deletedEntity = new entity("",-1) ;
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}
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void LinearProbing::add(entity contact){
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int ind = contact.hash_upper_lower_digit(contact.getName(),65407)%length ;
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for(int i=0; i<(int)contacts.size(); i++){
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if(contacts[ind] == deletedEntity || !contacts[ind]){
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contacts[ind] = new entity(contact.getName(),contact.getNumber()) ;
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return;
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}
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else if(contact.getName() == contacts[ind]->getName()){
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contacts[ind]->setNameNumber(contact.getName(),contact.getNumber()) ;
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actual_length++ ;
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return;
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}
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ind = (ind+1)%length ;
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}
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cout << "Can't add it, cause there is no an empty cell. \n" ;
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}
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void LinearProbing::remove(entity contact){
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int ind = contact.hash_upper_lower_digit(contact.getName(),65407)%length ;
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for(int i=0; i<(int)contacts.size(); i++){
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if(!contacts[ind]){
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cout << "There is no item called (" << contact.getName() << ")" << '\n';
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return;
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}
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else if(contacts[ind]->getName() == contact.getName()){
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delete contacts[ind] ;
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contacts[ind] = deletedEntity ;
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actual_length-- ;
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return;
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}
|
||||
ind = (ind+1)%length ;
|
||||
}
|
||||
cout << "There is no item called " << contact.getName() << ")";
|
||||
|
||||
}
|
||||
|
||||
void LinearProbing::printall(){
|
||||
cout << "Hash Table :- " << endl ;
|
||||
for(int i=0; i<length; i++){
|
||||
cout << i << " " ;
|
||||
if(!contacts[i])
|
||||
cout << "(Empty)" ;
|
||||
else if(contacts[i] == deletedEntity)
|
||||
cout << "(Deleted)" ;
|
||||
else
|
||||
contacts[i]->print() ;
|
||||
cout << '\n' ;
|
||||
}
|
||||
}
|
||||
|
||||
void LinearProbing::getContact(entity &contact){
|
||||
int ind = contact.hash_upper_lower_digit(contact.getName(),65407)%length ;
|
||||
for(int i=0; i<(int)contacts.size(); i++){
|
||||
if(!contacts[ind]){
|
||||
cout << "There is no item called (" << contact.getName() << ")" << '\n';
|
||||
return;
|
||||
}
|
||||
else if(contacts[ind]->getName() == contact.getName()){
|
||||
contact = *contacts[ind] ;
|
||||
return;
|
||||
}
|
||||
ind = (ind+1)%length ;
|
||||
}
|
||||
}
|
||||
|
||||
|
||||
|
||||
|
||||
|
|
@ -0,0 +1,25 @@
|
|||
|
||||
#ifndef LINEARPROBING_H_
|
||||
#define LINEARPROBING_H_
|
||||
|
||||
#include <vector>
|
||||
#include "entity.h"
|
||||
#include <iostream>
|
||||
|
||||
class LinearProbing {
|
||||
private:
|
||||
vector<entity*> contacts ;
|
||||
int length ;
|
||||
int actual_length ;
|
||||
entity* deletedEntity ;
|
||||
|
||||
public:
|
||||
LinearProbing(int length);
|
||||
void add(entity contact) ;
|
||||
void remove(entity contact) ;
|
||||
void printall() ;
|
||||
void getContact(entity &contact) ;
|
||||
|
||||
};
|
||||
|
||||
#endif /* LINEARPROBING_H_ */
|
||||
|
|
@ -0,0 +1,7 @@
|
|||
#include "Node.h"
|
||||
#include "entity.h"
|
||||
Node::Node(entity data_) {
|
||||
data = data_ ;
|
||||
next = 0 ;
|
||||
}
|
||||
|
||||
|
|
@ -0,0 +1,16 @@
|
|||
#include "entity.h"
|
||||
|
||||
#ifndef NODE_H_
|
||||
#define NODE_H_
|
||||
|
||||
class Node {
|
||||
|
||||
|
||||
public:
|
||||
|
||||
entity data ;
|
||||
Node* next ;
|
||||
Node(entity data_) ;
|
||||
};
|
||||
|
||||
#endif /* NODE_H_ */
|
||||
|
|
@ -0,0 +1,93 @@
|
|||
#include "entity.h"
|
||||
|
||||
#include <iostream>
|
||||
|
||||
using namespace std ;
|
||||
|
||||
entity::entity(){
|
||||
name = "" ;
|
||||
phoneNumber = -1 ;
|
||||
}
|
||||
|
||||
entity::entity(string name_, int phoneNumber_){
|
||||
name = name_ ;
|
||||
phoneNumber = phoneNumber_ ;
|
||||
}
|
||||
|
||||
int entity::hash_lower(){
|
||||
long long nn = INTERNAL_LIMIT ;
|
||||
long long sum = 0 ;
|
||||
for(int i=0; i < (int)name.size(); i++){
|
||||
sum = (sum*26 + name[i]-'a') % nn ;
|
||||
}
|
||||
return sum % nn ;
|
||||
}
|
||||
|
||||
int entity::hash_upper_lower_digit(string str, int num){
|
||||
long long nn = INTERNAL_LIMIT ;
|
||||
long long sum = 0, temp = 0 ;
|
||||
int base = 26 + 26 + 10 ; // The first 26 for upperLetter, the second 26 for lowerLetter, the last 10 for digits(0:9)
|
||||
|
||||
for(int i=0; i<(int)name.size(); i++){
|
||||
if(name[i] >= 'a' && name[i] <= 'z'){
|
||||
temp = name[i]-'a' ;
|
||||
}
|
||||
else if(name[i] >= 'A' && name[i] <= 'Z'){
|
||||
temp = 26 + name[i]-'A' ;
|
||||
}
|
||||
else if(name[i] >= '0' && name[i] <= '9'){
|
||||
temp = 26+26 + name[i]-'0' ;
|
||||
}
|
||||
sum = (base*sum+temp) % nn ;
|
||||
}
|
||||
|
||||
return sum ;
|
||||
|
||||
}
|
||||
|
||||
int entity::folding_hash(string str){
|
||||
long long sum = 0, n_ = INTERNAL_LIMIT ;
|
||||
for(int i=0; i<(int)name.size(); i+=4){
|
||||
string ans = " " ;
|
||||
for(int j=0; j<4; j++){
|
||||
ans += name[j] ;
|
||||
}
|
||||
|
||||
sum += hash_upper_lower_digit(ans,phoneNumber) ;
|
||||
sum %= n_ ;
|
||||
}
|
||||
return sum ;
|
||||
}
|
||||
|
||||
int entity::hash_num(int num){
|
||||
long long n_ = INTERNAL_LIMIT ;
|
||||
return (num % n_ + n_) % n_ ;
|
||||
}
|
||||
|
||||
int entity::hash_multiple(string str, int num){
|
||||
long long n_ = INTERNAL_LIMIT, sum = 0 ;
|
||||
sum += hash_upper_lower_digit(str,num) ;
|
||||
sum += hash_num(num) ;
|
||||
sum %= n_ ;
|
||||
|
||||
return sum ;
|
||||
}
|
||||
|
||||
|
||||
void entity::print(){
|
||||
cout << "(Name: " << name << " " << ",Phone Number:" << phoneNumber << ") " ;
|
||||
}
|
||||
|
||||
string entity::getName(){
|
||||
return name ;
|
||||
}
|
||||
|
||||
int entity::getNumber(){
|
||||
return phoneNumber ;
|
||||
}
|
||||
|
||||
|
||||
void entity::setNameNumber(string name_, int number_){
|
||||
name = name_ ;
|
||||
phoneNumber = number_ ;
|
||||
}
|
||||
|
|
@ -0,0 +1,27 @@
|
|||
#ifndef PHONEENTRY_H
|
||||
#define PHONEENTRY_H
|
||||
#include <string>
|
||||
|
||||
using namespace std ;
|
||||
|
||||
class entity
|
||||
{
|
||||
private:
|
||||
const static int INTERNAL_LIMIT = 2147483647;
|
||||
string name ; // we'll be hash according to name
|
||||
int phoneNumber ;
|
||||
public:
|
||||
entity() ;
|
||||
entity(string name_, int phoneNumber_) ;
|
||||
string getName() ;
|
||||
int getNumber() ;
|
||||
void setNameNumber(string name_, int number) ;
|
||||
int hash_lower() ; // use only lower case letter for hashing
|
||||
int hash_upper_lower_digit(string str, int num) ; // Hash according to name only
|
||||
void print() ;
|
||||
int folding_hash(string str) ;
|
||||
int hash_num(int num) ;
|
||||
int hash_multiple(string str, int num) ; // To hash according to name & phoneNumber
|
||||
};
|
||||
|
||||
#endif // PHONEENTRY_H
|
||||
|
|
@ -0,0 +1,139 @@
|
|||
#include "hashTable.h"
|
||||
|
||||
#include "Node.h"
|
||||
#include <iostream>
|
||||
|
||||
using namespace std ;
|
||||
|
||||
hashTable::hashTable(int length_, double limitLoadFactor){
|
||||
length = length_ ;
|
||||
loadFactor = limitLoadFactor ;
|
||||
contacts.resize(length_) ;
|
||||
contactsOfLinkedlist.resize(length_) ;
|
||||
actual_len = 0 ;
|
||||
}
|
||||
|
||||
void hashTable::add(entity contact){
|
||||
int ind = contact.hash_upper_lower_digit(contact.getName(),65407)%length ;
|
||||
|
||||
for(int i=0 ; i<(int)contacts[ind].size() ; i++){
|
||||
if(contacts[ind][i].getName() == contact.getName()){
|
||||
contacts[ind][i] = contact ;
|
||||
return;
|
||||
}
|
||||
}
|
||||
actual_len++ ;
|
||||
double ratio = (double)actual_len/length ;
|
||||
cout << "Current load factor : " << ratio << '\n' ;
|
||||
if(ratio >= loadFactor){
|
||||
rehash() ;
|
||||
}
|
||||
contacts[ind].push_back(contact) ;
|
||||
}
|
||||
|
||||
void hashTable::addLinkedlist(entity contact){
|
||||
int ind = contact.hash_upper_lower_digit(contact.getName(),65407)%length ;
|
||||
Node* curr = contactsOfLinkedlist[ind] ;
|
||||
Node* prev = 0 ;
|
||||
|
||||
if(!curr){
|
||||
contactsOfLinkedlist[ind] = new Node(contact) ;
|
||||
return;
|
||||
}
|
||||
while(curr){
|
||||
if(curr->data.getName() == contact.getName()){
|
||||
curr->data = contact ;
|
||||
return;
|
||||
}
|
||||
prev = curr ;
|
||||
curr = curr->next ;
|
||||
}
|
||||
Node *contactNode = new Node(contact) ;
|
||||
prev->next = contactNode ;
|
||||
contactNode->next = 0 ;
|
||||
}
|
||||
|
||||
void hashTable::printallLinkedlist(){
|
||||
cout << "Hash Table :- " << '\n' ;
|
||||
for(int i=0; i<(int)contactsOfLinkedlist.size(); i++){
|
||||
if(!contactsOfLinkedlist[i])
|
||||
continue ;
|
||||
cout << "Hash index : " << i << ": " ;
|
||||
Node* curr = contactsOfLinkedlist[i] ;
|
||||
while(curr){
|
||||
curr->data.print() ;
|
||||
curr = curr->next ;
|
||||
}
|
||||
cout << '\n' ;
|
||||
}
|
||||
}
|
||||
|
||||
|
||||
bool hashTable::Is_removed(entity contact){
|
||||
int ind = contact.hash_upper_lower_digit(contact.getName(),65407)%length ;
|
||||
for(int j=0; (int)j<(int)contacts[ind].size(); j++){
|
||||
if(contact.getName() == contacts[ind][j].getName()){
|
||||
swap(contacts[ind][j], contacts[ind].back()) ;
|
||||
contacts[ind].pop_back() ;
|
||||
return true ;
|
||||
}
|
||||
}
|
||||
return false ;
|
||||
}
|
||||
|
||||
void hashTable::remove(entity contact){
|
||||
if(!Is_removed(contact))
|
||||
cout << "There is no contact called " << contact.getName() << ", Please Choose Add" << endl ;
|
||||
else actual_len-- ;
|
||||
}
|
||||
|
||||
|
||||
void hashTable::printall(){
|
||||
cout << "Hash Table :-" << '\n' ;
|
||||
for(int i=0 ; i<length; i++){
|
||||
if(!(int)contacts[i].size())
|
||||
continue ;
|
||||
|
||||
cout << "Hash index : " << i << " :" ;
|
||||
for(int j=0 ; j<(int)contacts[i].size(); j++){
|
||||
contacts[i][j].print() ;
|
||||
}
|
||||
cout << '\n' ;
|
||||
}
|
||||
}
|
||||
|
||||
void hashTable::getentity(entity &contact){
|
||||
int ind = contact.hash_upper_lower_digit(contact.getName(),65407)%length ;
|
||||
for(int i=0; i<(int)contacts[ind].size(); i++){
|
||||
if(contact.getName() == contacts[ind][i].getName()){
|
||||
contact.setNameNumber(contacts[ind][i].getName(), contacts[ind][i].getNumber()) ;
|
||||
return ;
|
||||
}
|
||||
}
|
||||
cout << "There is no entity with given name " << contact.getName() ;
|
||||
}
|
||||
|
||||
|
||||
void hashTable::rehash(){
|
||||
|
||||
cout << "\nRehashing stratring now....\n" ;
|
||||
|
||||
vector< vector<entity> > temp ;
|
||||
temp.assign(contacts.begin(), contacts.end()) ;
|
||||
contacts.clear() ;
|
||||
contacts.resize(2*length);
|
||||
this->length *= 2 ;
|
||||
this->actual_len = 0 ;
|
||||
|
||||
|
||||
for(int i=0; i<(int)temp.size(); i++){
|
||||
for(int j=0; j<(int)temp[i].size(); j++){
|
||||
entity item(temp[i][j].getName(), temp[i][j].getNumber()) ;
|
||||
add(item) ;
|
||||
}
|
||||
}
|
||||
|
||||
printall() ;
|
||||
}
|
||||
|
||||
|
||||
|
|
@ -0,0 +1,30 @@
|
|||
#ifndef PHONEHASHTABLE_H
|
||||
#define PHONEHASHTABLE_H
|
||||
#include <string>
|
||||
#include <vector>
|
||||
#include "entity.h"
|
||||
#include "Node.h"
|
||||
|
||||
class hashTable
|
||||
{
|
||||
private:
|
||||
int length ;
|
||||
int actual_len ;
|
||||
double loadFactor ;
|
||||
vector< vector<entity> > contacts ;
|
||||
bool Is_removed(entity contact) ;
|
||||
vector<Node*> contactsOfLinkedlist ;
|
||||
|
||||
public:
|
||||
hashTable(int length_, double LIMIT_LOAD_FACTOR) ;
|
||||
void addLinkedlist(entity contact) ;
|
||||
void printallLinkedlist() ;
|
||||
void add(entity contact) ;
|
||||
void remove(entity contact) ;
|
||||
void getentity(entity &contact) ;
|
||||
void printall() ;
|
||||
void rehash() ;
|
||||
|
||||
};
|
||||
|
||||
#endif // PHONEHASHTABLE_H
|
||||
|
|
@ -0,0 +1,84 @@
|
|||
#include <iostream>
|
||||
#include "LinearProbing.h"
|
||||
#include "entity.h"
|
||||
#include "hashTable.h"
|
||||
|
||||
using namespace std;
|
||||
|
||||
int main() {
|
||||
|
||||
cout << "\nNormal Hash Table start :-\n" ;
|
||||
hashTable HT(8,0.5);
|
||||
HT.add(entity("FirstOne",1)) ;
|
||||
HT.add(entity("FirstOen",11)) ;
|
||||
HT.add(entity("SecondOne",2)) ;
|
||||
HT.add(entity("ThirdOne",3)) ;
|
||||
HT.add(entity("FourthOne",4)) ;
|
||||
HT.add(entity("FifthOne",5)) ;
|
||||
HT.printall() ;
|
||||
cout << '\n' ;
|
||||
|
||||
HT.remove(entity("FirstOn",1)) ; // There is no item called (FirstOn)
|
||||
cout << '\n' ;
|
||||
|
||||
HT.remove(entity("FirstOne",1)) ;
|
||||
HT.printall() ; // FirstOne entity will be deleted
|
||||
cout << '\n' ;
|
||||
|
||||
entity element("FirstOen",-1) ;
|
||||
HT.getentity(element) ; // There is no item called (FirstOne)
|
||||
element.print() ; // (Name: FirstOne ,Phone Number:-1)
|
||||
cout << '\n' ;
|
||||
|
||||
entity element2("FirstOn",-1) ;
|
||||
HT.getentity(element2) ; // // There is no item called (FirstOn)
|
||||
element2.print() ;
|
||||
cout << '\n' ;
|
||||
|
||||
cout << "\nEnd Normal Hash Table\n" ;
|
||||
|
||||
cout << "\nStart Hash Table using Linear Probing :- \n" ;
|
||||
LinearProbing HTLinearProbing(8);
|
||||
HTLinearProbing.add(entity("FirstOne",1)) ;
|
||||
HTLinearProbing.add(entity("FirstOen",11)) ;
|
||||
HTLinearProbing.add(entity("SecondOne",2)) ;
|
||||
HTLinearProbing.add(entity("ThirdOne",3)) ;
|
||||
HTLinearProbing.add(entity("FourthOne",4)) ;
|
||||
HTLinearProbing.add(entity("FifthOne",5)) ;
|
||||
HTLinearProbing.printall() ;
|
||||
cout << '\n' ;
|
||||
|
||||
HTLinearProbing.remove(entity("FirstOn",1)) ; // There is no item called (FirstOn)
|
||||
cout << '\n' ;
|
||||
|
||||
HTLinearProbing.remove(entity("FirstOne",1)) ;
|
||||
HTLinearProbing.printall() ; // FirstOne entity will be deleted
|
||||
cout << '\n' ;
|
||||
|
||||
entity elementLinearProbing("FirstOne",-1) ;
|
||||
HTLinearProbing.getContact(elementLinearProbing) ; // There is no item called (FirstOne)
|
||||
element.print() ; // (Name: FirstOne ,Phone Number:-1)
|
||||
cout << '\n' ;
|
||||
|
||||
entity elementLinearProbing2("FirstOn",-1) ;
|
||||
HTLinearProbing.getContact(elementLinearProbing2) ; // // There is no item called (FirstOn)
|
||||
element2.print() ;
|
||||
cout << '\n' ;
|
||||
|
||||
cout << "\nEnd Hash Table using Linear Probing \n" ;
|
||||
|
||||
|
||||
cout << "\nStart using LinkedList :- \n" ;
|
||||
hashTable HTLinkedlist(8,0.75);
|
||||
HTLinkedlist.addLinkedlist(entity("LLFirstOne",1)) ;
|
||||
HTLinkedlist.addLinkedlist(entity("LLSecondOne",2)) ;
|
||||
HTLinkedlist.addLinkedlist(entity("LLThirdOne",3)) ;
|
||||
HTLinkedlist.addLinkedlist(entity("LLFourthOne",4)) ;
|
||||
HTLinkedlist.addLinkedlist(entity("LLFifthOne",5)) ;
|
||||
HTLinkedlist.printallLinkedlist() ;
|
||||
cout << "End using LinkedList \n\n" ; // It's to print the same as the above test
|
||||
|
||||
|
||||
|
||||
return 0;
|
||||
}
|
||||
Loading…
Reference in New Issue