Cod sursa(job #1998721)

Utilizator GinguIonutGinguIonut GinguIonut Data 8 iulie 2017 22:02:11
Problema Sortare prin comparare Scor 100
Compilator cpp Status done
Runda Arhiva educationala Marime 0.89 kb
#include <fstream>

#define nMax 500001

using namespace std;

ifstream fin("algsort.in");
ofstream fout("algsort.out");

int n, v[nMax], aux[nMax];

void mergeSort(int st, int dr)
{
    if(dr-st+1<=1)
        return;

    int mid=st+(dr-st)/2;
    mergeSort(st, mid);
    mergeSort(mid+1, dr);

    int i=st, j=mid+1, poz=st-1;
    while(i<=mid && j<=dr)
    {
        if(v[i]<=v[j])
        {
            aux[++poz]=v[i];
            i++;
        }
        else
        {
            aux[++poz]=v[j];
            j++;
        }
    }

    for(int ii=i; ii<=mid; ii++)
        aux[++poz]=v[ii];
    for(int jj=j; jj<=dr; jj++)
        aux[++poz]=v[jj];
    for(int i=st; i<=dr; i++)
        v[i]=aux[i];
}

int main()
{
    fin>>n;
    for(int i=1; i<=n; i++)
        fin>>v[i];
    mergeSort(1, n);
    for(int i=1; i<=n; i++)
        fout<<v[i]<<" ";
}