程序如下：

int write_vector_txt(char *filename,int *parent_to_child,int num)

{

ofstream write_txt(filename);//将costs写成一个txt

if( !write_txt )

{

cout<<“Cannot open the costs file.”<<endl;

return 1;

}
for(int i = 0; i < num; i++)

{
write_txt<<parent_to_child[i]<<” “;

}

write_txt<<endl;

write_txt.close();
return 0;

}