# HG changeset patch
# User deba
# Date 1197885266 0
# Node ID faaa54ec452044b0d5b4be316a0ab723c8237ab7
# Parent  e67ec65747faf10587a55a29838ec5159d8db6b0
Bug fix

diff -r e67ec65747fa -r faaa54ec4520 lemon/unionfind.h
--- a/lemon/unionfind.h	Wed Dec 12 13:35:55 2007 +0000
+++ b/lemon/unionfind.h	Mon Dec 17 09:54:26 2007 +0000
@@ -692,6 +692,9 @@
       int cdx = newClass();
       classes[cdx].prev = -1;
       classes[cdx].next = firstClass;
+      if (firstClass != -1) {
+	classes[firstClass].prev = cdx;
+      }
       firstClass = cdx;
       
       int idx = newItem();