Cod sursa(job #1945511)

Utilizator nicu_serteSerte Nicu nicu_serte Data 29 martie 2017 15:28:25
Problema Sortare prin comparare Scor 100
Compilator cpp Status done
Runda Arhiva educationala Marime 1.22 kb
#include <fstream>
#include <vector>
using namespace std;
ifstream fin("algsort.in");
ofstream fout("algsort.out");
int n, v[500005];
void citire()
{
    int i;
    fin>>n;
    for(i=1; i<=n; i++)
        fin>>v[i];
    fin.close();
}
void afisare()
{
    int i;
    for(i=1; i<=n; i++)
        fout<<v[i]<<' ';
    fout<<'\n';
    fout.close();
}
void mergeVect(int st, int dr, int m)
{
    int i, j, k, n1, n2;
    n1=m-st+1;
    n2=dr-m;
    int a[n1+3], b[n2+3];
    for(i=1; i<=n1; i++)
        a[i]=v[i+st-1];
    for(i=1; i<=n2; i++)
        b[i]=v[i+m];
    i=j=1; k=st;
    while(i<=n1 && j<=n2)
    {
        if(a[i]<b[j])
        {
            v[k]=a[i];
            i++;
        }
        else
        {
            v[k]=b[j];
            j++;
        }
        k++;
    }
    while(i<=n1)
    {
        v[k]=a[i];
        k++; i++;
    }
    while(j<=n2)
    {
        v[k]=b[j];
        k++; j++;
    }
}
void mergeSort(int st, int dr)
{
    int m;
    if(st<dr)
    {
        m=(st+dr)/2;
        mergeSort(st, m);
        mergeSort(m+1, dr);
        mergeVect(st, dr, m);
    }
}
int main()
{
    citire();
    mergeSort(1, n);
    afisare();
    return 0;
}