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Cod sursa(job #353246)
/*
* File: main.cpp
* Author: speedemon
*
* Created on October 2, 2009, 7:09 PM
*/
#include <fstream>
#include <cstdlib>
#define InFile "algsort.in"
#define OutFile "algsort.out"
#define temp template< class T >
/*
*
*/
using namespace std;
ifstream in;
ofstream out;
temp class HeapSort
{
T *v;
unsigned size;
inline void swap( unsigned, unsigned );
void downheap( unsigned, unsigned );
public:
HeapSort();
~HeapSort();
inline unsigned getsize();
inline void push( istream& );
inline void output( ostream& );
void heapsort( unsigned, unsigned );
};
temp HeapSort<T>::HeapSort()
{size=0;
v=new T;
}
temp HeapSort<T>::~HeapSort()
{
delete[] v;
}
temp inline unsigned HeapSort<T>::getsize()
{
return size;
}
temp inline void HeapSort<T>::push( istream& in )
{++size;
v=(T*)realloc( (void*)v, size*sizeof(T) );
in>>v[size-1];
}
temp inline void HeapSort<T>::output( ostream& out )
{
for( unsigned i=0; i < size; ++i ) out<<v[i]<<' ';
}
temp inline void HeapSort<T>::swap( unsigned a, unsigned b )
{
v[a]+=v[b];
v[b]=v[a]-v[b];
v[a]-=v[b];
}
temp void HeapSort<T>::downheap( unsigned start, unsigned end )
{
for( unsigned root=2*start+1; root < end; )
{
if( root+1 < end && v[root] < v[root+1] ) ++root;
if( v[root] <= v[start] ) return;
swap( root, start );
start=root;
root=2*start+1;
}
}
temp void HeapSort<T>::heapsort( unsigned start, unsigned end )
{
for( int w=end/2-1; w >= 0; -- w )
downheap( w, end );
for( end=end-1; end > start; --end )
{
swap( 0, end );
downheap( 0, end );
}
}
int main()
{int N;
HeapSort< unsigned > a;
in.open(InFile);
in>>N;
while( N-- )
{
a.push(in);
}
a.heapsort( 0, a.getsize() );
out.open(OutFile);
a.output( out );
return EXIT_SUCCESS;
}