add day 4, part 2

day04/common.rs

@@ -64,4 +64,11 @@ impl Assignment {
         self.range1.contains(self.range2.start()) && self.range1.contains(self.range2.end())
             || self.range2.contains(self.range1.start()) && self.range2.contains(self.range1.end())
     }
+
+    pub fn has_overlapping_ranges(&self) -> bool {
+        self.range1.contains(self.range2.start())
+            || self.range1.contains(self.range2.end())
+            || self.range2.contains(self.range1.start())
+            || self.range2.contains(self.range1.end())
+    }
 }

day04/part2.rs

@@ -0,0 +1,32 @@
+// Copyright 2022 Christian Ulrich
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with this program.  If not, see <http://www.gnu.org/licenses/>.
+//
+// usage: ./part2 < input
+
+pub mod common;
+
+use common::Assignments;
+
+fn main() -> Result<(), &'static str> {
+    let assignments = Assignments {};
+    let mut result = 0;
+    for assignment in assignments {
+        if assignment?.has_overlapping_ranges() {
+            result += 1;
+        }
+    }
+    println!("{result}");
+    Ok(())
+}