From e973a7925aa06241bc03ab30f4d337c77bfe988f Mon Sep 17 00:00:00 2001
From: Martin Ashby <martin@ashbysoft.com>
Date: Sat, 3 Dec 2022 10:47:53 +0000
Subject: Tidy up day 3

---
 src/day3.rs | 43 +++++++++++++++++++------------------------
 1 file changed, 19 insertions(+), 24 deletions(-)

diff --git a/src/day3.rs b/src/day3.rs
index 5c01b7a..d19d51f 100644
--- a/src/day3.rs
+++ b/src/day3.rs
@@ -1,34 +1,29 @@
 use std::{collections::{HashSet, HashMap}};
 
 pub fn run(input: String) {
-    if !input.is_ascii() {
-        panic!("input wasn't ascii, character calculations won't work!");
-    }
-
     let scores_table = make_scores_table();
-
-    let ll: Vec<&str> = input.lines().collect();
-    
-    let score = ll.chunks(3).map(|gm| {
-        let init: Option<HashSet<char>> = None;
-        let lb: Vec<char> = gm.into_iter().fold(init, |maybe_acc, m| {
-            let cs: HashSet<char> = m.chars().collect();
-            if let Some(acc) = maybe_acc {
-                let rr: HashSet<char> = acc.intersection(&cs).map(|x| {x.clone()}).collect();
-                Some(rr)
-            } else {
-                Some(cs)
-            }
-        })
-            .expect("didn't get any group members??!")
-            .into_iter().collect();
-        let ct = lb.len();
+    let score = input.lines()
+        .collect::<Vec<&str>>()
+        .chunks(3).map(|group| {
+            let init: Option<HashSet<char>> = None;
+            let overlapping_chars: Vec<char> = group.into_iter().fold(init, |acc, group_member| {
+                let group_member_charset: HashSet<char> = group_member.chars().collect();
+                if let Some(acc) = acc {
+                    let intersected: HashSet<char> = acc.intersection(&group_member_charset).map(|x| {x.clone()}).collect();
+                    Some(intersected)
+                } else {
+                    Some(group_member_charset)
+                }
+            })
+        .expect("didn't get any group members??!")
+        .into_iter().collect();
+        let ct = overlapping_chars.len();
         if ct != 1 {
-            panic!("Couldn't find exactly one badge for group! found {}, {:?}", ct, gm);
+            panic!("Couldn't find exactly one badge for group! found {}, {:?}", ct, group);
         }
-        let ch = lb.into_iter().next().expect("foo");
-        scores_table.get(&ch).expect(format!("couldn't find score for char {}", ch).as_str())
+        scores_table[&overlapping_chars[0]]
     }).sum::<u32>();
+
     println!("Day 3: {}", score);
 }
 
-- 
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