Cod sursa(job #1477255)

Utilizator pepsiM4A1Ozturk Arif pepsiM4A1 Data 25 august 2015 19:42:06
Problema Sortare prin comparare Scor 60
Compilator cpp Status done
Runda Arhiva educationala Marime 1.08 kb
#include <cstdio>
#include <algorithm>
using namespace std;
int a[500023],n;
/*int part(int st,int dr)
{
    int val=a[st];
    int i=st-1,j=dr+1;
    while(1)
    {
        do
        {
            j--;
        }while(a[j]>val&&j>=st);
        do
        {
            i++;
        }while(a[i]<val&&i<=dr);
        if(i<j)
        {
            swap(a[i],a[j]);
        }
        else
        {
            return j;
        }
    }
}*/
int part(int st,int dr)
{
    int val=a[dr];
    int i=st;
    for(int j=st;j<dr;j++)
    {
        if(a[j]<=val)
        {
            swap(a[i],a[j]);
            i++;
        }
    }
    swap(a[i],a[dr]);
    return i;
}
void quicksort(int st,int dr)
{
    if(st>=dr) return;
    int pv=part(st,dr);
    quicksort(st,pv-1);
    quicksort(pv+1,dr);
}
int main()
{
    freopen ("algsort.in","r",stdin);
    freopen ("algsort.out","w",stdout);
    scanf("%d",&n);
    for(int i=1;i<=n;i++) scanf("%d",&a[i]);
    random_shuffle(a+1,a+n+1);
    quicksort(1,n);
    for(int i=1;i<=n;i++) printf("%d ",a[i]);
}