Cod sursa(job #2269493)

Utilizator alexnigaNiga Alexandru alexniga Data 26 octombrie 2018 01:03:49
Problema Sortare prin comparare Scor 100
Compilator cpp-64 Status done
Runda Arhiva educationala Marime 1.24 kb
#include <iostream>
#include <fstream>

using namespace std;

ifstream f("algsort.in");
ofstream g("algsort.out");

int x[500001], nrinv, n;

void citire()
{
    int i;
    f >> n;
    for(i = 1; i <=n; ++i)
    {
        f >> x[i];
    }
}

void interclaseaza(int st, int mij, int dr)
{
    int i, j, k = 0, y[500001];;
    i = st;
    j = mij + 1;


    while (i <= mij && j <= dr)
    {
        if (x[i] <= x[j])
        {
            k++;
            y[k] = x[i];
            i++;
        }
        else
        {
            k++;
            y[k] = x[j];
            j++;
        }
    }
    while (i <= mij)
    {
        k++;
        y[k] = x[i];
        ++i;
    }
    while (j <= dr)
    {
        k++;
        y[k] = x[j];
        ++j;
    }

    k=1;
    for (i = st; i <= dr; ++i)
        {
            x[i] = y[k];
            k++;
        }
}


void MergeSort(int st, int dr)
{

    if(st < dr)
    {
        int mij = (st + dr) / 2;
        MergeSort(st, mij);
        MergeSort(mij + 1, dr);
        interclaseaza(st, mij, dr);
    }
}

int main()
{   int i;
    citire();
    MergeSort(1, n);
    for(i = 1; i <= n; i++)
        g << x[i] << " ";

    return 0;
}