Working version of Kruskal's algorithm. The running time is very bad though.

src/graph.h

@@ -0,0 +1,25 @@
+/*
+    graph.h -- header for graph.c
+    Copyright (C) 2001 Guus Sliepen <guus@sliepen.warande.net>,
+                  2001 Ivo Timmermans <itimmermans@bigfoot.com>
+
+    This program is free software; you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation; either version 2 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program; if not, write to the Free Software
+    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+
+    $Id: graph.h,v 1.1.2.1 2001/10/29 13:14:57 guus Exp $
+*/
+
+extern void mst_kruskal(void);
+extern void mst_prim(void);
+extern void sssp_bfs(void);