diff -r cd72eae05bdf -r 3c00344f49c9 lemon/static_graph.h
--- a/lemon/static_graph.h	Mon Jul 16 16:21:40 2018 +0200
+++ b/lemon/static_graph.h	Wed Oct 17 19:14:07 2018 +0200
@@ -203,7 +203,7 @@
       built = true;
 
       node_num = n;
-      arc_num = std::distance(first, last);
+      arc_num = static_cast<int>(std::distance(first, last));
 
       node_first_out = new int[node_num + 1];
       node_first_in = new int[node_num];