Cod sursa(job #2251094)

Utilizator AlexandruGabrielAliciuc Alexandru AlexandruGabriel Data 1 octombrie 2018 09:43:10
Problema Sortare prin comparare Scor 60
Compilator cpp Status done
Runda Arhiva educationala Marime 0.82 kb
#include <bits/stdc++.h>

using namespace std;

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

int Pivot(int a[], int st, int dr)
{
    swap (a[(st + rand() % (dr - st + 1))], a[dr]);
    int piv = a[dr], pivPos = st;
    for (int i = st; i < dr; i++)
    {
        if (a[i] <= piv)
        {
            swap(a[i], a[pivPos++]);
        }
    }
    swap(a[pivPos], a[dr]);
    return pivPos;
}

void Quicksort(int a[], int st, int dr)
{
    if (st < dr)
    {
        int index = Pivot(a, st, dr);
        Quicksort(a, st, index - 1);
        Quicksort(a, index + 1, dr);
    }
}

int main()
{
    int n, a[500001];
    fin >> n;
    for (int i = 1; i <= n; i++)
        fin >> a[i];
    Quicksort(a, 1, n);
    for (int i = 1; i <= n; i++)
        fout << a[i] << " ";
    return 0;
}