Cod sursa(job #3346028)

Utilizator Sabin1133Padurariu Sabin Sabin1133 Data 12 martie 2026 10:35:55
Problema Sortare prin comparare Scor 80
Compilator cpp-64 Status done
Runda Arhiva educationala Marime 0.9 kb
#include <cstdlib>
#include <ctime>

#include <iostream>

#define NMAX 500000

void quick_sort(int *v, int n)
{
    int k, a;
    int m = 1;

    if (n < 2)
        return;

    k = rand() % n;

    a = v[n - 1];
    v[n - 1] = v[k];
    v[k] = a;

    for (int i = 0, j = 0; j < n - 1; ++j)
        if (v[j] < v[n - 1]) {
            a = v[i];
            v[i] = v[j];
            v[j] = a;

            ++i;
            ++m;
        }

    a = v[n - 1];
    v[n - 1] = v[m - 1];
    v[m - 1] = a;

    quick_sort(v, m - 1);
    quick_sort(v + m, n - m);
}

int main()
{
    int n;
    int v[NMAX];

    freopen("algsort.in", "r", stdin);
    freopen("algsort.out", "w", stdout);

    // srand(time(nullptr));

    std::cin >> n;

    for (int i = 0; i < n; ++i)
        std::cin >> v[i];

    quick_sort(v, n);

    for (int i = 0; i < n; ++i)
        std::cout << v[i] << ' ';

    std::cout << '\n';

    return 0;
}