Implement binary heap in c++?, C/C++ Programming

Assignment Help:

A:BinaryHeap.h

------------

#ifndef BINARY_HEAP_H_

#define BINARY_HEAP_H_

#include "dsexceptions.h"

#include "vector.h"

// BinaryHeap class

// CONSTRUCTION: with an optional capacity (that defaults to 100)

// *********PUBLIC OPERATIONS**************

// void insert( x ) --> Insert x

// deleteMin( minItem ) --> Remove (and optionally return) smallest item

// Comparable findMin( ) --> Return smallest item

// bool isEmpty( ) --> if empty, Return true; else false

// bool isFull( ) --> if full , Return true; else false

// void makeEmpty( ) --> Eliminate all items

// ***********ERRORS*************

// Throws Underflow & Overflow as necessary

template

class BinaryHeap

{

public:

explicit BinaryHeap( int capacity = 100 );

bool isEmpty( ) const;

bool isFull( ) const;

const Comparable & findMin( ) const;

void insert( const Comparable & x );

void deleteMin( );

void deleteMin( Comparable & minItem );

void makeEmpty( );

private:

int currentSize; // Number of elements in heap vector array; // The heap array

void buildHeap( );

void percolateDown( int hole );

};

#endif

 

BinaryHeap.cpp

--------------

#include "BinaryHeap.h"

/**

* Construct the binary heap.

* Capacity means capacity of binary heap.

*/

template

BinaryHeap::BinaryHeap( int capacity )

: array( capacity + 1 ), currentSize( 0 )

{

}

 

/**

* Insert item x in the priority queue, maintaining heap order.

* Duplicates are allowed.

* Throw Overflow if container is full.

*/

template

void BinaryHeap::insert( const Comparable & x )

{

if( isFull( ) )

throw Overflow( );

// Percolate up

int hole = ++currentSize;

for( ; hole > 1 && x < array[ hole / 2 ]; hole /= 2 )

array[ hole ] = array[ hole / 2 ];

array[ hole ] = x;

}

/**

* Determine the smallest item in the priority queue.

* Return the smallest item, or if empty , throw Underflow.

*/

template

const Comparable & BinaryHeap::findMin( ) const

{

if( isEmpty( ) ) throw Underflow( ); return array[ 1 ];

}

/**

* From priority queue remove smallest item.

* Throw Underflow if empty.

*/

template

void BinaryHeap::deleteMin( )

{

if( isEmpty( ) )

throw Underflow( );

array[ 1 ] = array[ currentSize-- ];

percolateDown( 1 );

}

 

/**

* From the priority queue eliminate the smallest item

* and place it in minItem. Throw Underflow if empty.

*/

template

void BinaryHeap::deleteMin( Comparable & minItem )

{

if( isEmpty( ) )

throw Underflow( );

minItem = array[ 1 ];

array[ 1 ] = array[ currentSize-- ];

percolateDown( 1 );

}

/**

* From arbitrary establish heap order property

* Arrangement of items. Runs in linear time.

*/

template

void BinaryHeap::buildHeap( )

{

for( int i = currentSize / 2; i > 0; i-- )

percolateDown( i );

}

/**

* Test if the priority queue is empty logically.

* Return true if empty, or else false.

*/

template

bool BinaryHeap::isEmpty( ) const

{

return currentSize == 0;

}

/**

* Test if priority queue is logically full.

* Return true if full, false otherwise.

*/

template

bool BinaryHeap::isFull( ) const

{

return currentSize == array.size( ) - 1;

}

/**

* Logically make priority queue empty.

*/

template

void BinaryHeap::makeEmpty( )

{

currentSize = 0;

}

/**

* To percolate down, internal technique in the heap.

* hole is the index whereupon the percolate begins.

*/

template

void BinaryHeap::percolateDown( int hole )

{

/* 1*/ int child;

/* 2*/ Comparable tmp = array[ hole ];

/* 3*/ for( ; hole * 2 <= currentSize; hole = child )

{

/* 4*/ child = hole * 2;

/* 5*/ if( child != currentSize && array[ child + 1 ] < array[ child ] )

/* 6*/ child++;

/* 7*/ if( array[ child ] < tmp )

/* 8*/ array[ hole ] = array[ child ];

else

/* 9*/ break;

}

/*10*/ array[ hole ] = tmp;

}

TestBinaryHeap.cpp

------------------

#include

#include "BinaryHeap.h"

#include "dsexceptions.h"

// Test program int main( )

{

int numItems = 10000; BinaryHeap h( numItems ); int i = 37;

int x;

try

{

for( i = 37; i != 0; i = ( i + 37 ) % numItems )

h.insert( i );

for( i = 1; i < numItems; i++ )

{

h.deleteMin( x );

if( x != i )

cout << "Oops! " << i << endl;

}

for( i = 37; i != 0; i = ( i + 37 ) % numItems )

h.insert( i );

h.insert( 0 );

h.insert( i = 999999 ); // Should overflow

}

catch( Overflow )

{ cout << "Overflow (expected)! " << i << endl; }

return 0;

}

 


Related Discussions:- Implement binary heap in c++?

Write a simple telephone book program, Write a simple telephone book progra...

Write a simple telephone book program that stores the names and phone numbers of your friends/acquaintances in a file. Your program should have the abilities to: a. Add entries (n

Luminous jewels polishing game, Luminous Jewels - The Polishing Game Bytel...

Luminous Jewels - The Polishing Game Byteland county is very famous for luminous jewels. Luminous jewels are used in making beautiful necklaces. A necklace consists of various lum

Maze, How would I make a maze in C++? I would prefer to use the recursion m...

How would I make a maze in C++? I would prefer to use the recursion maze generation algorithm if possible, thanks!

Input and output routines, Data is required to be fed into the program (inp...

Data is required to be fed into the program (input) and sent out of the program (output). Considering the draughtsman using a CAD station, the input is his commands to cause lines/

Create a program that converts numbers to characters, People sometimes give...

People sometimes give their phone numbers using one or more alphabetic characters. Create a program that converts the alphabetic characters to their corresponding numbers. For exam

#title. RETIRED ON SOCIAL SECURITY., IS IT POSSIBLE FOR YOU TO WRITE A PR...

IS IT POSSIBLE FOR YOU TO WRITE A PROGRAM FOR ME TO MEASURE EXISTING ANGLES AND DO IF AND THEN FROM THIS , AND TO PLACE FIXED ANGLES AT CERTAIN POSITION AS A ADD WITH DLL FOR CERTA

Constructor, Why copy constructor accepts reference to an object and not t...

Why copy constructor accepts reference to an object and not the object itself, whether ah hence it we do otherwise

What is union, What is Union? Intimately associated with the structure ...

What is Union? Intimately associated with the structure is the union which as well contains multiple members. Unlike a structure but the members of a union share the same stora

Type compatibility, Define  T y pe c o m p a t i b i li t y? ...

Define  T y pe c o m p a t i b i li t y? T o a s s i g n i n t t o s m a l l i n t t h e v a r i a b l e should b e

Write program to get largest element in array using function, Write a progr...

Write a program to get the largest element in an array using Function? # include int largest(int b[],int); main() { int lar,a[5]={12,2,36,40,5}; lar=largest(a,n); printf("

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd