Cod sursa(job #1234990)

Utilizator somuBanil Ardej somu Data 28 septembrie 2014 15:22:51
Problema Sortare prin comparare Scor 100
Compilator cpp Status done
Runda Arhiva educationala Marime 0.84 kb
#include <iostream>
#include <fstream>

#define nmax 500001

using namespace std;

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

int n, i;
int A[nmax];

void qs(int st, int dr)
{
    
    if (st >= dr)
        return;
        
    int i = st, j = dr;
    int pivot = A[(st + dr) >> 1];
    
    for (; i <= j;)
    {
        
        for (; pivot > A[i];) i++;
        for (; pivot < A[j];) j--;
        
        if (i <= j)
        {
            swap(A[i], A[j]);
            i++, j--;
        }
        
    }
    
    qs(st, j);
    qs(i, dr);
    
}

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

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

int main()
{
    
    read();
    qs(1, n);
    write();
    
    fin.close();
    fout.close();
    
    return 0;
}