Pagini recente » Cod sursa (job #1035760) | Cod sursa (job #1861759) | Cod sursa (job #299793) | Cod sursa (job #254410) | Cod sursa (job #2987290)
#include <iostream>
#include <time.h>
#include <fstream>
using namespace std;
ifstream f("algsort.in");
ofstream g("algsort.out");
int n,v[500001],temp[500001];
void quicksort(int st,int dr)
{
if(st>=dr) return;
int k,l,p,pivot,poz_left=st,poz_right=dr,aux=0,nr=0;
// the length of the current array
// srand(time(NULL));
k = v[rand()%(dr-st+1) + st];
l = v[rand()%(dr-st+1) + st];
p = v[rand()%(dr-st+1) + st];
if((k<l && l<p) || (p < l && l < k))
pivot = l;
else if ((l<k && k<p) || (p<k && k<l))
pivot = k;
else
pivot = p;
for(int i=st;i<=dr;i++)
{
if(v[i]<pivot)
temp[poz_left++] = v[i];
else
if(v[i]>pivot)
temp[poz_right--] = v[i];
else
{
if(!nr)
{
aux = v[i];
nr++;
}
else
temp[poz_left++] = v[i];
}
}
temp[poz_right] = aux;
for(int i=st;i<=dr;i++)
v[i] = temp[i];
quicksort(st,poz_left-1);
quicksort(poz_right+1,dr);
}
int main()
{
f>>n;
for(int i=0;i<n;i++) f>>v[i];
quicksort(0,n-1);
for(int i=0;i<n;i++) g<<v[i]<<" ";
return 0;
}