Cod sursa(job #2296246)

Utilizator adimiclaus15Miclaus Adrian Stefan adimiclaus15 Data 4 decembrie 2018 16:19:09
Problema Sortare prin comparare Scor 60
Compilator cpp-64 Status done
Runda Arhiva educationala Marime 0.85 kb
#include <iostream>//pivot random
#include <ctime>
#include <cstdlib>
#include <fstream>
using namespace std;
ifstream f("algsort.in");
ofstream g("algsort.out");
int n,a[500001];
int partitionare(int st,int dr)
{
    int i,j,pivot;
    swap(a[st+rand()%(dr-st+1)],a[dr]);
    pivot=a[dr];
    j=st-1;
    for(i=st;i<=dr;i++)
    {
        if(a[i]<=pivot)
        {
            j++;
            swap(a[i],a[j]);
        }
    }
    return j;
}
void QuickSort(int st,int dr)
{
    int poz;
    poz=partitionare(st,dr);
    if(st<poz-1)
    {
        QuickSort(st,poz-1);
    }
    if(dr>poz+1)
    {
        QuickSort(poz+1,dr);
    }
}
int main()
{
    int i;
    srand(time(NULL));
    f>>n;
    for(i=1;i<=n;i++)
    {
        f>>a[i];
    }
    QuickSort(1,n);
    for(i=1;i<=n;i++)
        g<<a[i]<<" ";
    return 0;
}