Cod sursa(job #757975)

Utilizator mihai995mihai995 mihai995 Data 13 iunie 2012 23:55:44
Problema Sortare prin comparare Scor 0
Compilator cpp Status done
Runda Arhiva educationala Marime 0.81 kb
#include <fstream>
#include <cstdlib>
using namespace std;

const int N = 500005;
int v[N], aux[N], n;

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

inline void sch(int& a, int& b)
{
    int c = a;
    a = b;
    b = c;
}

void quick(int st,int dr)
{
    if (st >= dr)
        return;

    int p = v[ st + rand() % ( dr - st + 1 ) ], i, j;

    for (i = st, j = dr ; i < j ; i++, j--)
    {
        while (i < j && v[i] < p)
            i++;

        while (i < j && v[j] > p)
            j--;

        sch(v[i], v[j]);
    }

    quick(st, i - 2);
    quick(i, dr);
}

int main()
{
    in >> n;

    for (int i = 1 ; i <= n ; i++)
        in >> v[i];

    quick(1, n);

    for (int i = 1 ; i <= n ; i++)
        out << v[i] << " ";
    out << "\n";
    return 0;
}