#include "graph/pr.h"
#include <stdio.h>

void
pr_vertex (unsigned int vi)
{
  printf ("%d", vi);
}

void
pr_edge (unsigned int vi, unsigned int vj)
{
  putchar ('{');
  pr_vertex (vi);
  putchar (',');
  pr_vertex (vj);
  putchar ('}');
}

void
pr_arc (unsigned int vi, unsigned int vj)
{
  putchar ('(');
  pr_vertex (vi);
  putchar (',');
  pr_vertex (vj);
  putchar (')');
}