1 files changed, 30 insertions, 0 deletions

diff --git a/2022/15/a.rs b/2022/15/a.rs
new file mode 100644
index 0000000..7b87150
--- /dev/null
+++ b/2022/15/a.rs
@@ -0,0 +1,30 @@
+use std::cmp::max;
+use std::collections::HashSet;
+mod common;
+use common::*;
+
+fn main() {
+    const Y: i64 = 2000000;
+    let sensors = read_sensors_from_stdin();
+    let mut ranges = sensors.iter()
+        .map(|s| s.get_range(Y))
+        .filter(|r| r.left <= r.right)
+        .collect::<Vec<_>>();
+    ranges.sort();
+    let mut current = Range { left: i64::MIN, right: i64::MIN };
+    let mut sum = 0;
+    for r in ranges {
+        current = Range {
+            left: max(current.right+1, r.left),
+            right: max(current.right, r.right)
+        };
+        sum += (current.right - current.left + 1) as usize;
+    }
+    sum -= sensors.iter()
+        .map(|s| s.b)
+        .collect::<HashSet<_>>() // Remove duplicates
+        .iter()
+        .filter(|b| b.y == Y)
+        .count();
+    println!("{sum}");
+}