Cut down runtime on part 2 of day 6 by 10 times

crates/solutions/src/day6.rs

@@ -8,6 +8,7 @@ type NumericValue = u64;
 pub fn solve_task_1(input: &str) -> String {
     let parsed = parsing::parsing(input);
     let mut how_many_times_won = 1;
+
     for next_record in parsed {
         how_many_times_won *= all_rounds_of_durations(next_record.time())
             .into_iter()
@@ -48,21 +49,26 @@ pub fn solve_task_2(input: &str) -> String {
     unreachable!();
 }
 
-fn all_rounds_of_durations(duration: NumericValue) -> Vec<NumericValue> {
+fn all_rounds_of_durations(duration: NumericValue) -> impl Iterator<Item = NumericValue> {
+    let limit = duration as usize;
     std::iter::repeat(duration)
-        .take(duration as usize)
+        .take(limit)
         .enumerate()
         .map(|(speed_duration, duration)| {
             simuluate_reached_distance_at(duration, speed_duration as NumericValue)
         })
-        .collect()
 }
 
 fn simuluate_reached_distance_at(
     duration: NumericValue,
     speed_duration: NumericValue,
 ) -> NumericValue {
-    assert!(duration >= speed_duration);
+    assert!(
+        duration >= speed_duration,
+        "Duration {:?}. Speed Duration: {:?}",
+        duration,
+        speed_duration
+    );
     let rest_time = duration - speed_duration;
     rest_time * speed_duration
 }