add std::cmp::Ordering re-export

src/prelude.rs

@@ -8,7 +8,10 @@ pub use std::{
         VecDeque as D,
         BinaryHeap as B,
     },
-    cmp::Ordering as Or,
+    cmp::{
+        Ordering as Or,
+        Reverse as Rev,
+    },
 };
 
 pub type SS = &'static str;