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Cod sursa(job #455498)
/*
* File: main.cpp
* Author: virtualdemon
*
* Created on May 13, 2010, 4:05 PM
*/
#include <vector>
#include <cstdlib>
#include <fstream>
#include <iterator>
/*
*
*/
using namespace std;
vector< int > v;
inline int medianof3( int x, int y, int z )
{
int xx=v[x], yy=v[y], zz=v[z];
int a=max( xx, max( yy, zz ) ), b, c=min( xx, min( yy, zz ) );
if( a == xx )
{
if( c == yy )
b=zz;
else b=yy;
}
else if( a == yy )
{
if( c == xx )
b=zz;
else b=xx;
}
else {
if( c == xx )
b=yy;
else b=xx;
}
v[x]=c; v[y]=b; v[z]=a;
return y;
}
inline void QSort( int left, int right )
{
if( left < right )
{
int lleft=left-1, rright=right+1, pValue=v[ medianof3( left, left+(right-left)/2, right ) ];
for( ; ; )
{
while( pValue > v[++lleft] );
while( pValue < v[--rright] );
if( lleft > rright )
break;
swap( v[lleft], v[rright] );
}
if( left < rright )
QSort( left, rright );
if( lleft < right )
QSort( lleft, right );
}
}
int main(int argc, char** argv)
{
int N;
ifstream in( "algsort.in" );
in>>N;
copy( istream_iterator<int>(in), istream_iterator<int>(), back_inserter(v) );
ofstream out( "algsort.out" );
QSort( 0, N-1 );
copy( v.begin(), v.end(), ostream_iterator<int>( out, " " ) );
out<<'\n';
return (EXIT_SUCCESS);
}