day 14 part 2 removed hashset for loop check

Cargo.toml

@@ -6,3 +6,7 @@ edition = "2021"
 [dependencies]
 itertools = "0.13.0"
 regex = "1.11.1"
+
+[profile.dev]
+opt-level = 3
+

src/day14.rs

@@ -1,8 +1,4 @@
-use std::{
+use std::fs::read_to_string;
-    collections::HashSet,
-    fs::read_to_string,
-    io::{self, BufRead},
-};
 
 use itertools::Itertools;
 
@@ -69,17 +65,16 @@ fn parse(input: &str) -> Vec<((i64, i64), (i64, i64))> {
 }
 
 #[allow(unused)]
-fn part2(input: &str) -> RiddleResult {
+fn part2(input: &str) -> i64 {
     let width = 101;
     let height = 103;
     let mut robots = parse(input);
-    let mut seen = HashSet::new();
+    let max_seconds = width * height as i64;
     for second in 0.. {
-        if seen.contains(&robots) {
+        if second > max_seconds {
-            panic!("Loop after {second} rounds, but no christmas tree!");
+            panic!("Seen all combinations but no christmas tree. So sad!");
         }
         let mut grid: Grid<u8> = Grid::from_default(101, 103);
-        seen.insert(robots.clone());
         robots.iter_mut().for_each(|((px, py), (vx, vy))| {
             *px = (*px + width + *vx) % width;
             *py = (*py + height + *vy) % height;
@@ -99,20 +94,23 @@ fn part2(input: &str) -> RiddleResult {
         });
 
         if robots.iter().filter(|(s, _)| grid[*s] > 1).count() > robots.len() * 70 / 100 {
-            printr(&robots, width, height);
+            // printr(&robots, width, height);
-            println!("after {} seconds. Press enter to continue or type 'merry christmas' if you can spot a tree!", second + 1); //+1 because we look at it after they have changed
+            // println!("after {} seconds. Press enter to continue or type 'merry christmas' if you can spot a tree!", second + 1); //+1 because we look at it after they have changed
-            let stdin = io::stdin();
+            return second + 1;
-            let line = stdin.lock().lines().next().unwrap().unwrap();
+            // let stdin = io::stdin();
-            if line.as_str().eq_ignore_ascii_case("merry christmas") {
+            // let line = stdin.lock().lines().next().unwrap().unwrap();
-                return second + 1;
+            // if line.as_str().eq_ignore_ascii_case("merry christmas") {
-            }
+            // return second + 1;
+            // }
         }
     }
     unreachable!()
 }
 
+#[allow(unused)]
 type Robot = ((i64, i64), (i64, i64));
 
+#[allow(unused)]
 fn printr(robots: &[Robot], width: i64, height: i64) {
     for y in 0..height {
         for x in 0..width {