Cod sursa(job #1467129)

Utilizator pepsiM4A1Ozturk Arif pepsiM4A1 Data 2 august 2015 20:22:58
Problema Sortare prin comparare Scor 100
Compilator cpp Status done
Runda Arhiva educationala Marime 1.05 kb
#include <cstdio>
#include <algorithm>
using namespace std;
int a[500023],b[500023];
int n;
void brute(int s,int e)
{
    for(int i=s;i<=e;i++)
    {
        for(int j=i+1;j<=e;j++)
        {
            if(a[i]>a[j]) swap(a[i],a[j]);
        }
    }
}
void interclas(int s,int e)
{
    int mij=(s+e)/2;
    int p1=s,p2=mij+1;
    for(int xy=s;xy<=e;xy++)
    {
        if((p1<=mij&&a[p1]<a[p2])||p2>e)
        {
            b[xy]=a[p1];
            p1++;
        }
        else
        {
            b[xy]=a[p2];
            p2++;
        }
    }
    for(int i=s;i<=e;i++)
    {
        a[i]=b[i];
    }
}
void mergesort(int s,int e)
{
    if(e-s+1<=3) brute(s,e);
    else
    {
        int mij=(s+e)/2;
        mergesort(s,mij);
        mergesort(mij+1,e);
        interclas(s,e);
    }
}
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]);
    mergesort(1,n);
    for(int i=1;i<=n;i++) printf("%d ",a[i]);
}