Cod sursa(job #1321252)

Utilizator Impaler_009Mihai Nitu Impaler_009 Data 18 ianuarie 2015 21:57:52
Problema Sortare prin comparare Scor 80
Compilator cpp Status done
Runda Arhiva educationala Marime 0.8 kb
#include <fstream>
#include <ctime>
#include <cstdlib>
#define maxn 500001

using namespace std;

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

int v[maxn],n;

//Partition2

void quicksort (int p, int q)
{
    if (q<=p) return;

    int x=rand()%(q-p+1)+p;
    swap (v[x],v[p]);
    int i = p, j = q;

    while (i < j)
    {
        while (j > i && v[j] >= v[i])
            --j;
        if (j > i)
            swap (v[i],v[j]);

        while (i < j && v[i] <= v[j])
            ++i;
        if (i < j)
            swap (v[j],v[i]);

    }

    quicksort (p,j-1);
    quicksort (j+1,q);
}

int main()
{
    fin>>n;
    for (int i=1; i<=n; ++i) fin>>v[i];

    srand (time(NULL));
    quicksort (1,n);

    for (int i=1; i<=n; ++i) fout<<v[i]<<" ";
}