cleanup

d04.cc

@@ -9,13 +9,12 @@ public:
     unsigned min;
     unsigned max;
 
-    bool contains(const Range &in) {
+    bool contains(const Range &in) const {
         return min <= in.min && max >= in.max;
     }
 
-    bool overlaps(const Range &in) {
+    bool overlaps(const Range &in) const {
-        return (min <= in.min && in.min <= max)
+        return min <= in.max && in.min <= max;
-            || (in.min <= min && min <= in.max);
     }
 };