int i4_max ( int i1, int i2 );
int i4_min ( int i1, int i2 );
int i4_power ( int i, int j );
int *i4_to_digits_binary ( int i, int n );
int *i4vec_copy_new ( int n, int a1[] );
int i4vec_dot_product ( int n, int x[], int y[] );
void i4vec_print ( int n, int a[], string title );
int subset_sum_count ( int n, int w[], int t, int ind_min, int ind_max );
int *subset_sum_find ( int n, int w[], int t, int ind_min, int ind_max, 
  int &ind );
void timestamp ( );