really tight solution to day 5

2020/day_5/src/main.rs

@@ -0,0 +1,25 @@
+fn main() {
+    let contents = std::fs::read_to_string("input").unwrap();
+    let mut passes = Vec::new();
+    for line in contents.lines() {
+        let code = line
+            .chars()
+            .map(|c| match c {
+                'L' | 'F' => '0',
+                'R' | 'B' => '1',
+                _ => c,
+            })
+            .collect::<String>();
+        let code_in_bin = isize::from_str_radix(&code.to_string(), 2).unwrap() as u32;
+        passes.push(code_in_bin);
+    }
+    passes.sort();
+    // println!("{:?}", passes);
+    let min: u32 = passes.first().cloned().unwrap();
+    let max: u32 = passes.last().cloned().unwrap();
+    for i in min..max {
+        if !passes.contains(&i) {
+            println!("Seat {} is empy", i);
+        }
+    }
+}