Cod sursa(job #1513202)

Utilizator andreiblajdevAndrei Blaj andreiblajdev Data 29 octombrie 2015 09:05:54
Problema Sortare prin comparare Scor 100
Compilator cpp Status done
Runda Arhiva educationala Marime 0.88 kb
#include <iostream>
#include <fstream>

#define nmax 500001

using namespace std;

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

int n;
int A[nmax];

void read();
void qs(int st, int dr);
void write();

int main()
{

    read();
    qs(1, n);
    write();

    fi.close();
    fo.close();

    return 0;
}

void read()
{
    fi >> n;
    for (int i = 1; i <= n; i++)
        fi >> A[i];
}

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

    int pivot = A[(st + dr) >> 1];
    int i = st;
    int j = dr;

    for (; i <= j;)
    {
        for (; A[i] < pivot;) i++;
        for (; A[j] > pivot;) j--;

        if (i <= j)
        {
            swap(A[i], A[j]);
            i++, j--;
        }

    }

    qs(st, j);
    qs(i, dr);

}

void write()
{
    for (int i = 1; i <= n; i++)
        fo << A[i] << " ";
}