Cod sursa(job #1228910)

Utilizator blasterzMircea Dima blasterz Data 15 septembrie 2014 19:38:12
Problema Sortare prin comparare Scor 60
Compilator cpp Status done
Runda Arhiva educationala Marime 0.78 kb
#include <cstdio>
#include <cstdlib>
#include <ctime>
#include <algorithm>

using namespace std;

#define N 500001

int a[N], n;

int part(int a[], int l, int r) {
    swap(a[r], a[ l + rand() % (r - l) + 1]);
    int pivot = a[r], j = l - 1;
    for (int i = l; i <= r; ++i)
        if (a[i] <= pivot)
            swap(a[i], a[++j]);
    return j;
}

void quick(int a[], int l, int r) {
    if (l >= r)
        return;
    int m = part(a, l, r);
    quick(a, l, m - 1);
    quick(a, m + 1, r);
}

int main() {
    srand(time(0));
    freopen ("algsort.in", "r", stdin);
    freopen ("algsort.out", "w", stdout);
    scanf ("%d\n", &n);
    int i;
    for (i = 1; i <= n; ++i) {
        scanf ("%d ", &a[i]);
    }
    quick(a, 1, n);

    for (i = 1; i <= n;++i)
        printf ("%d ", a[i]);
}