Cod sursa(job #1319014)

Utilizator GeorgianaMMirlogeanu Georgiana GeorgianaM Data 16 ianuarie 2015 16:27:15
Problema Sortare prin comparare Scor 100
Compilator cpp Status done
Runda Arhiva educationala Marime 0.96 kb
#include <iostream>
#include<fstream>

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

int a[500001],b[500001];
int n,i,j,k,q;

void merge_sort(int stg,int m,int drt)
{   i=stg;k=i;
    j=m+1;

     while(i<=m && j<=drt)
        {if(a[i]<a[j])
            {b[k]=a[i];
                          i++;}
         else {b[k]=a[j];
                          j++;}

        k++;}
    if(i>m)
    for(q=j;q<=drt;q++)
    {
        b[k]=a[q];
        k++;
    }
    else for(q=i;q<=m;q++)
    {
        b[k]=a[q];
        k++;
    }
    for(i=stg;i<=drt;i++)
        a[i]=b[i];
}

void mergesort(int stg,int drt)
{
    int m;
    if(stg<drt)
    {
        m=(stg+drt)/2;
        mergesort(stg,m);
        mergesort(m+1,drt);
        merge_sort(stg,m,drt);
    }
}

int main()
{   f>>n;
    for(i=1;i<=n;i++)
        f>>a[i];
    mergesort(1,n);
    for(i=1;i<=n;i++)
      g<<a[i]<<" ";
    return 0;
}