Cod sursa(job #2856250)

Utilizator norryna07Alexandru Norina norryna07 Data 23 februarie 2022 17:00:30
Problema Sortare prin comparare Scor 60
Compilator cpp-64 Status done
Runda Arhiva educationala Marime 0.88 kb
#include <fstream>
#include <algorithm>
#define N 500002
using namespace std;

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

int a[N], n;

void citire()
{
    fin>>n;
    for (int i=1; i<=n; ++i) fin>>a[i];
    fin.close(); 
}

int pivotare(int st, int dr)
{
    int p=rand()%(dr-st+1)+st;
    swap(a[p], a[st]);
    int i=st, j=dr, pasi=0, pasj=1;
    while (i<j)
    {
        if (a[i]>a[j])
        {
            swap(a[i], a[j]);
            pasi=!pasi; pasj=!pasj;
        }
        i+=pasi; j-=pasj;
    }
    return i;
}

void qsort(int st, int dr)
{
    if (st<=dr)
    {
        int p=pivotare(st, dr);
        qsort(st, p-1);
        qsort(p+1, dr);
    }
}

void afisare()
{
    for(int i=1; i<=n; ++i) fout<<a[i]<<' ';
    fout.close();
}

int main()
{
    citire();
    qsort(1, n);
    afisare();
    return 0;
}