Cod sursa(job #2673558)

Utilizator stefan.ghenescu2005@gmail.comStefan Ghenescu [email protected] Data 17 noiembrie 2020 10:46:38
Problema Sortare prin comparare Scor 60
Compilator cpp-64 Status done
Runda Arhiva educationala Marime 0.88 kb
#include <fstream>
#include <cstdlib>
#include <ctime>

using namespace std;

ifstream in("algsort.in");
ofstream out("algsort.out");

int v[500005];

int choosepivot(int st, int dr)
{
    int sizeinterval=dr-st+1;
    return rand()%sizeinterval+st;
}

void quicksort(int v[], int st, int dr)
{
    if(st>=dr)
    {
        return;
    }
    int pivot=choosepivot(st,dr);
    int poz=st;
    swap(v[pivot], v[dr]);
    for(int i=st;i<dr;i++)
    {
        if(v[i]<=v[dr])
        {
            swap(v[i],v[poz]);
            poz++;
        }
    }
    swap(v[poz],v[dr]);
    quicksort(v,st,poz-1);
    quicksort(v,poz+1,dr);
}

int main()
{
    srand(time(0));
    int n;
    in>>n;
    for(int i=0;i<n;i++)
    {
        in>>v[i];
    }
    quicksort(v,0,n-1);
    for(int i=0;i<n;i++)
    {
        out<<v[i]<<' ';
    }
    return 0;

}