Make clippy happy

2023/day5/src/main.rs

@@ -2,7 +2,7 @@ use std::collections::{HashMap, VecDeque};
 use std::ops::Range;
 use DataType::*;
 
-const FILE_STR: &'static str = include_str!("input.txt");
+const FILE_STR: &str = include_str!("input.txt");
 
 #[derive(Debug, PartialEq, Eq, Hash, Copy, Clone)]
 enum DataType {
@@ -109,7 +109,7 @@ impl Almanac {
         let maps = data_chunks
             .into_iter()
             .map(|chunk| {
-                let mut lines: VecDeque<_> = chunk.split("\n").collect();
+                let mut lines: VecDeque<_> = chunk.split('\n').collect();
                 let type_line_parts: Vec<_> =
                     lines.pop_front().unwrap().split_whitespace().collect();
                 let types: Vec<_> = type_line_parts[0]
@@ -119,11 +119,11 @@ impl Almanac {
                 let (from, to) = (types[0], types[1]);
                 let mappings: Vec<DataMap> = lines
                     .into_iter()
-                    .filter(|l| l.len() > 0)
+                    .filter(|l| !l.is_empty())
                     .map(|line| {
                         line.split_whitespace()
                             .map(|s| s.trim())
-                            .filter(|s| s.len() > 0)
+                            .filter(|s| !s.is_empty())
                             .map(|s| s.parse::<u64>().unwrap())
                             .collect::<Vec<u64>>()
                     })
@@ -144,11 +144,10 @@ impl Almanac {
     fn x_from_y(&self, x: DataType, y: DataType, search: u64) -> u64 {
         self.maps
             .get(&(y, x))
-            .expect(&format!("Missing mapping from {:?} to {:?}", x, y))
-            .into_iter()
-            .filter(|dm| dm.to_range.contains(&search))
+            .unwrap_or_else(|| panic!("Missing mapping from {:?} to {:?}", x, y))
+            .iter()
             .find_map(|dm| dm.get_dest_idx(search))
-            .unwrap_or_else(|| search)
+            .unwrap_or(search)
     }
 
     fn location_from_seed(&self, seed: u64) -> u64 {
@@ -162,31 +161,36 @@ impl Almanac {
         self.x_from_y(Location, Humidity, humid)
     }
 
-    fn locations_from_seeds(&self) -> HashMap<u64, u64> {
+    fn locations_from_seeds(&self) -> Vec<u64> {
         self.seeds
             .iter()
-            .map(|s| (*s, self.location_from_seed(*s)))
+            .map(|s| self.x_from_y(Soil, Seed, *s))
+            .map(|s| self.x_from_y(Fertilizer, Soil, s))
+            .map(|f| self.x_from_y(Water, Fertilizer, f))
+            .map(|w| self.x_from_y(Light, Water, w))
+            .map(|l| self.x_from_y(Temperature, Light, l))
+            .map(|t| self.x_from_y(Humidity, Temperature, t))
+            .map(|h| self.x_from_y(Location, Humidity, h))
             .collect()
     }
 
     fn lowest_seed_location(&self) -> u64 {
-        self.locations_from_seeds()
-            .iter()
-            .map(|(_, l)| *l)
-            .min()
-            .unwrap()
+        self.locations_from_seeds().iter().copied().min().unwrap()
     }
 
     fn lowest_seed_range_location(&self) -> u64 {
+        let range_flattener = |r: Range<u64>| r.clone().collect::<Vec<_>>();
         self.seed_ranges
-            .iter()
-            .map(|r| {
-                r.clone()
-                    .into_iter()
-                    .map(|s| self.location_from_seed(s))
-                    .min()
-                    .unwrap()
-            })
+            .clone()
+            .into_iter()
+            .flat_map(range_flattener)
+            .map(|s| self.x_from_y(Soil, Seed, s))
+            .map(|s| self.x_from_y(Fertilizer, Soil, s))
+            .map(|f| self.x_from_y(Water, Fertilizer, f))
+            .map(|w| self.x_from_y(Light, Water, w))
+            .map(|l| self.x_from_y(Temperature, Light, l))
+            .map(|t| self.x_from_y(Humidity, Temperature, t))
+            .map(|h| self.x_from_y(Location, Humidity, h))
             .min()
             .unwrap()
     }
@@ -229,7 +233,7 @@ mod tests {
     #[test]
     fn test_locations_from_seeds() {
         let almanac = Almanac::parse(EXAMPLE_FILE_STR);
-        let expected = HashMap::from([(79, 82), (14, 43), (55, 86), (13, 35)]);
+        let expected = Vec::from([82, 43, 86, 35]);
         assert_eq!(expected, almanac.locations_from_seeds());
     }