d10p2

day10/src/main.rs

@@ -26,7 +26,7 @@ fn parse_line(line: String) -> Result<Inst, ParseError> {
 fn main() {
     let file = File::open(&env::args().nth(1).unwrap()).unwrap();
     let reader = io::BufReader::new(file);
-    let mut xs: Vec<i64> = vec![0, 1];
+    let mut xs: Vec<i64> = vec![1];
 
     for line in reader.lines().flatten() {
         let last_x = *xs.last().unwrap();
@@ -36,10 +36,12 @@ fn main() {
             Err(e) => { eprintln!("error: {:?}", e); process::exit(1) },
         }
     }
-    let res: i64 = xs.iter().enumerate()
-        .skip(20).step_by(40)
-        .map(|(i, &x)| (i as i64)*x)
-        .sum();
-    println!("{:?}", res);
+
+    let screen: Vec<_> = xs.iter().enumerate()
+        .map(|(i, &x)| if ((i as i64) % 40 - x).abs() <= 1 { '#' } else { '.' })
+        .collect();
+    for i in 0..6 {
+        println!("{}", screen[(i*40)..((i+1)*40)].iter().collect::<String>());
+    }
 }