From d1a30ea6293a12e607ba7319a1f1558378c21d77 Mon Sep 17 00:00:00 2001
From: jazzpi <jasper@mezzo.de>
Date: Tue, 13 Dec 2022 15:38:10 +0100
Subject: [PATCH] Day 4, puzzle 2

---
 src/bin/d4p2.rs | 9 +++++++++
 src/day4.rs     | 4 ++++
 2 files changed, 13 insertions(+)
 create mode 100644 src/bin/d4p2.rs

diff --git a/src/bin/d4p2.rs b/src/bin/d4p2.rs
new file mode 100644
index 0000000..239ca70
--- /dev/null
+++ b/src/bin/d4p2.rs
@@ -0,0 +1,9 @@
+use aoc22::{day4, util};
+
+pub fn main() {
+    let assignments = day4::parse_assignments(&util::parse_input());
+
+    let overlapping = assignments.iter().filter(|a| a.0.overlaps(&a.1)).count();
+
+    println!("{} assignments overlap", overlapping);
+}
diff --git a/src/day4.rs b/src/day4.rs
index c257aaa..556230b 100644
--- a/src/day4.rs
+++ b/src/day4.rs
@@ -10,6 +10,10 @@ impl Assignment {
     pub fn contains(&self, other: &Self) -> bool {
         self.lower_bound <= other.lower_bound && self.upper_bound >= other.upper_bound
     }
+
+    pub fn overlaps(&self, other: &Self) -> bool {
+        self.lower_bound <= other.upper_bound && self.upper_bound >= other.lower_bound
+    }
 }
 
 pub fn parse_assignments(input: &String) -> Vec<(Assignment, Assignment)> {