Cod sursa(job #272213)

Utilizator sigridMaria Stanciu sigrid Data 6 martie 2009 16:48:11
Problema Sortare prin comparare Scor 100
Compilator cpp Status done
Runda Arhiva educationala Marime 0.65 kb
#include <fstream.h>
#define dim 500001

int n, a[dim], b[dim];

void merge_sort(int l, int r)
{
int m,i,j,k;

m=(l+r)/2;

if(l==r) return;

merge_sort(l,m);
merge_sort(m+1,r);

i=l;
j=m+1;
k=l;
while(i<=m||j<=r)
 {
  if( j>r || (i<=m && a[i]<a[j]) )
   {
    b[k]=a[i];

    k++;
    i++;
   }
   else
     {
      b[k]=a[j];

      k++;
      j++;
     }
 }

for(k=l;k<=r;k++)
   a[k]=b[k];

}

int main()
{
int i;

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

f>>n;
for(i=1;i<=n;i++)
 f>>a[i];

merge_sort(1,n);

for(i=1;i<=n;i++)
 g<<a[i]<<' ';

g<<'\n';

f.close();
g.close();
return 0;
 }