Cod sursa(job #2315615)

Utilizator RazvanucuPopan Razvan Calin Razvanucu Data 10 ianuarie 2019 12:28:01
Problema Sortare prin comparare Scor 0
Compilator cpp-64 Status done
Runda Arhiva educationala Marime 1.19 kb
#include <iostream>
#include <fstream>
using namespace std;
ifstream f("algsort.in");
ofstream g("algsort.out");
int N,v[500000],i;
void interclasare(int v[],int l,int m,int r)
{
    int i,j,k;
    int n1=m-l+1;
    int n2=r-m;


    int L[n1],R[n2];


    for(i=0;i<n1;i++)
        L[i]=v[l+i];
    for(j=0;j<n2;j++)
        R[j]=v[m+1+j];


    i=0;
    j=0;
    k=l;
    while (i<n1 && j<n2)
    {
        if (L[i]<=R[j])
        {
            v[k]=L[i];
            i++;
        }
        else
        {
            v[k]=R[j];
            j++;
        }
        k++;
    }


    while(i<n1)
    {
        v[k]=L[i];
        i++;
        k++;
    }


    while(j<n2)
    {
        v[k]=R[j];
        j++;
        k++;
    }
}


void mergeSort(int v[],int l,int r)
{
    if (l < r)
    {

        int m=l+(r-l)/2;
        mergeSort(v,l,m);
        mergeSort(v,m+1,r);

        interclasare(v,l,m,r);
    }
}
int afisare(int v[],int N)
{
    int i;
    for(i=0;i<N;i++)
        g<<v[i];
    return 0;
}
int main()
{

    f>>N;
    for(i=0;i<N;i++)
        f>>v[i];


    mergeSort(v,0,N-1);
    afisare(v,N);
    return 0;
}