adjust time output and add overall time

src/main.rs

@@ -1,4 +1,4 @@
-use std::time::Instant;
+use std::time::{Instant, Duration};
 
 use aoc::util::parse::ParseExt;
 
@@ -44,6 +44,8 @@ fn main() {
         .filter(|s| day == Some(s.day) || day.is_none())
         .collect();
 
+    let count = solutions.len();
+    let mut overall_duration = Duration::new(0, 0);
     for Solution {
         year,
         day,
@@ -54,10 +56,12 @@ fn main() {
         let start = Instant::now();
         let (aw1, aw2) = (run)(input);
         let elapsed = start.elapsed();
-        println!("{year} Day {day:02} ({})", elapsed.as_micros());
+        overall_duration += elapsed;
+        println!("{year} Day {day:02} ({:?})", elapsed);
         println!("    Part 1: {aw1}");
         println!("    Part 2: {aw2}");
     }
+    println!("Total solutions: {count} ({overall_duration:?})")
 }
 
 fn solutions() -> impl Iterator<Item = Solution> {