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/* Determine if a graph is bipartite or not.
*/
BEG_G{
int vc, c, color[node_t];
node_t v;
edge_t e;
$tvtype = TV_dfs;
$tvroot = fstnode($);
}
N{
if ($tvedge == NULL)
color[$] = 1;
if (color[$] == 1)
c = 2;
else
c = 1;
for (e = fstedge($); e; e = nxtedge(e,$)) {
v = opp(e,$);
vc = color[v];
if (vc == 0)
color[v] = c;
else if (vc != c) {
printf(2, "Not bipartite\n");
exit(1);
}
}
}