Cod sursa(job #1276648)

Utilizator Narcys01Ciovnicu Narcis Narcys01 Data 26 noiembrie 2014 18:02:03
Problema Sortare prin comparare Scor 40
Compilator cpp Status done
Runda Arhiva educationala Marime 0.98 kb
#include <cstdio>

using namespace std;

int a[500004], n;

inline void Sch(int &x, int &y)
{
    int aux;
    aux = x;
    x = y;
    y = aux;
}

inline int Pivot(int st, int dr)
{
    int i, j, piv;
    piv = a[st];
    i = st + 1;
    j = dr;
    while (i <= j)
    {
        if (a[i] <= piv) i++;
        if (a[j] >= piv) j--;
        if (i < j && a[i] > piv && piv > a[j])
        {
            Sch(a[i], a[j]);
            i++;
            j--;
        }
    }
    Sch(a[i-1], a[st]);
    return i - 1;
}

inline void QuickSort(int st, int dr)
{
    int m;
    m = Pivot(st, dr);
    if (st < m - 1) QuickSort(st, m - 1);
    if (dr > m + 1) QuickSort(m + 1, dr);
}

int main()
{
    int i;
    freopen("algsort.in", "r", stdin);
    scanf("%d", &n);
    for (i = 1; i <= n; i++)
        scanf("%d", &a[i]);
    QuickSort(1, n);
    freopen("algsort.out", "w", stdout);
    for (i = 1; i <= n; i++)
        printf("%d ", a[i]);
    return 0;
}