Cod sursa(job #2505547)

Utilizator tziplea_stefanTiplea Stefan tziplea_stefan Data 6 decembrie 2019 23:52:54
Problema Sortare prin comparare Scor 60
Compilator cpp-64 Status done
Runda Arhiva educationala Marime 0.79 kb
#include <fstream>
#include <cstdlib>

using namespace std;

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

const int VAL=500005;

int N, M, i, j, v[VAL];
int be, en, pivot;

int Partition(int be, int en)
{
    int pivot=be+(rand()%(en-be+1));
    int i=be, P=v[pivot];
    swap(v[pivot], v[en]);
    for (int j=be; j<=en; j++)
    {
        if (v[j]<=P)
        {
            swap(v[i], v[j]);
            i++;
        }
    }
    return i-1;
}

void Quicksort(int be, int en)
{
    if (be>=en)
        return;
    int pos=Partition(be, en);
    Quicksort(be, pos-1);
    Quicksort(pos+1, en);
}

int main()
{
    fin >> N;
    for (i=1; i<=N; i++)
        fin >> v[i];
    Quicksort(1, N);
    for (i=1; i<=N; i++)
        fout << v[i] << " ";
    fin.close();
    fout.close();
    return 0;
}