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Cod sursa(job #657189)
#include <fstream>
using namespace std;
int n,i,a[502010],b[502020];
void interclasare(int a[], int l, int r)
{
int m=(l+r)/2;
int i,j,k;
k=l-1;
i=l;
j=m+1;
while(i<=m && j<=r)
{
if (a[i]<a[j])
{
k++;
b[k]=a[i];
i++;
}
else
{
k++;
b[k]=a[j];
j++;
}
while(i<=m)
{
k++;
b[k]=a[i];
i++;
}
while(j<=r)
{
k++;
b[k]=a[j];
j++;
}
}
for (i=l;i<=r;++i)
a[i]=b[i];
}
void mergesort(int a[], int l, int r)
{
if (l<r)
{
int m=(l+r)/2;
mergesort(a,l,m);
mergesort(a,m+1,r);
interclasare(a,l,r);
}
}
int main()
{
ifstream f("algsort.in");
ofstream g("algsort.out");
f>>n;
for (i=1;i<=n;i++)
f>>a[i];
mergesort(a,1,n);
for (i=1;i<=n;i++)
g<<a[i]<<" ";
return 0;
}