Cod sursa(job #2284536)

Utilizator severutBogdan Sever-Cristian severut Data 17 noiembrie 2018 11:28:08
Problema Sortare prin comparare Scor 60
Compilator cpp-64 Status done
Runda Arhiva educationala Marime 0.87 kb
#include <iostream>
#include <fstream>
#include <cstdlib>
#include <ctime>

using namespace std;

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

int v[500002];
int partitionare(int l,int r)
{
    srand (time(NULL));
    int  p=rand()%(r-l)+l;
    swap (v[p],v[r]);
    p=v[r];
    int i=l;
    while (v[i]<=p && i<r)
    {
        i++;
    }
    for (int c=i; c<r; c++)
    {

        if (v[c]<=p)
        {
            swap(v[c],v[i]);
            i++;
        }
    }
    swap(v[i],v[r]);
    return i;
}
void qsort(int l,int r)
{
    if (r-l<1)
    {
        return;
    }
    int p=partitionare(l,r);

        qsort(l,p-1);
        qsort(p+1,r);
}
int main()
{
    int n,i;
    in>>n;
    v[n+1]=-1;
    for (i=1; i<=n; i++)
        in>>v[i];
    qsort(1,n);
    for (i=1; i<=n; i++)
        out<<v[i]<<" ";
    return 0;
}