add missing header

newling · newling · commit 76735544ef6a · 2019-06-27T06:40:10.000+01:00
diff --git a/zentas/include/zentas/lpmetric.hpp b/zentas/include/zentas/lpmetric.hpp
@@ -19,6 +19,7 @@ class TMetric{
 
 */
 
+#include <algorithm>
 #include <zentas/sparsevectorrfcenter.hpp>
 #include <zentas/tdatain.hpp>
 /* the above is included for this guy:
