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

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;

}

 

Posted Date: 3/20/2013 3:53:36 AM | Location : United States







Related Discussions:- Implement binary heap in c++?, Assignment Help, Ask Question on Implement binary heap in c++?, Get Answer, Expert's Help, Implement binary heap in c++? Discussions

Write discussion on Implement binary heap in c++?
Your posts are moderated
Related Questions
write a c program to solve exanple of lamis therom

Can any constructor throw an exception? How to handle error while the constructor fails?

We want Guys For Job in Gaming Tracks Company for a mobile game developing Project Description: I want a team of game developers for life-time as mobile dev team in my compan

Static Class Members As we already know all the objects of the class have dissimilar data members but invoke the similar member functions. Though, there is an exception to this

C Program for CREATE MATRICES #include stdio.h> #include conio.h> void main() {           int a[10][10],rw=0,clm=0,i=0,j=0;           char s=' ';           c


Define the Classification of Operators in C Language? Depending on the function performed the operator can be classified as 1. Arithmetic Operator 2. Logical Operator 3. Inc

Problem : Change to palindrome A palindrome is a string that reads the same from both the ends. Given a string S convert it to a palindrome by doing character replacement. Your ta

1. Using Visual C++ and your OpenGL configured environment, write an application that displays a “unique” graphical scene that you designed and coded for this course. What yo

Overloading Unary Operators class sign {int a,b,c; public: sign(){}; sign(int,int,int); void putdata(void); void operator-(); }; void sign::operator-() {a=