Cod sursa(job #693951)

Utilizator Ast09Stoica Anca Ast09 Data 27 februarie 2012 17:49:55
Problema Sortare prin comparare Scor 100
Compilator cpp Status done
Runda Arhiva educationala Marime 0.75 kb
#include<fstream>
using namespace std;

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

int n,i,v[500005],x[500005];

void merge( int a , int b)
{
	int m,i,j,u=0;
	if(a>=b) return ;
	m=(a+b)/2;
	merge(a,m);
	merge(m+1,b);
	i=a;j=m+1;
	while(i<=m && j<=b)
	{
		if(i==-1 && j==-1) break;
		else if(i==-1)
			{
				v[++u]=x[j];
				j++;
			}
			else if(j==-1)
				{
					v[++u]=x[i];
					i++;
				}
				else
				{
					if(x[i]<x[j])
					{
						v[++u]=x[i];
						i++;
						if(i==m+1) i=-1;
					}
					else
					{
						v[++u]=x[j];
						j++;
						if(j==b+1) j=-1;
					}
				}
	}
	for(i=a;i<=b;i++) x[i]=v[i-a+1];
}

int main ()
{
	f>>n;
	for(i=1;i<=n;i++) f>>x[i];
	merge(1,n);
	for(i=1;i<n;i++)
    g<<x[i]<<' ';
	g<<x[n]<<'\n';
return 0;
}