Cod sursa(job #1660370)

Utilizator SlevySlevoaca Stefan-Gabriel Slevy Data 23 martie 2016 00:14:37
Problema Sortare prin comparare Scor 100
Compilator cpp Status done
Runda Arhiva educationala Marime 0.91 kb
#include <iostream>
#include <fstream>
#include <algorithm>
#include <stdlib.h>

using namespace std;

ifstream in("algsort.in");
ofstream out("algsort.out");
int *a;
int n;

void quicksort(int x,int y)
{
    if(x<y)
    {
        int i =x,j=y,pivot = a[i+rand()%(j-i+1)];
        while(i<j)
        {
            while(a[i] < pivot)
                i++;
            while(a[j] > pivot)
                j--;
            if(i<=j)
            {
                swap(a[i],a[j]);
                i++;
                j--;
            }
        }
        if(x < j)
            quicksort(x,j);
        if(i<y)
            quicksort(i,y);
    }

}

int main()
{
    in>>n;
    a = new int[n+1];
    for(int i=1;i<=n;i++)
       in>>a[i];
    in.close();
    ///
    quicksort(1,n);
    ///
    for(int i=1;i<=n;i++)
    out<<a[i]<<" ";
    delete[] a;
    out.close();
    return 0;
}