From 7b53b318da4d61c88f9676a49e6ef0766116bd1a Mon Sep 17 00:00:00 2001
From: nekineki <nekineki@nekineki.net>
Date: Thu, 7 Dec 2023 20:59:08 +0100
Subject: day07 derive Ord

---
 2023/day07.rs | 38 ++++++++++----------------------------
 1 file changed, 10 insertions(+), 28 deletions(-)

diff --git a/2023/day07.rs b/2023/day07.rs
index 24635b3..e65748d 100644
--- a/2023/day07.rs
+++ b/2023/day07.rs
@@ -1,11 +1,10 @@
-use std::cmp::Ordering;
 use std::fs::File;
 use std::io::Read;
 
-#[derive(Debug)]
+#[derive(Debug, PartialEq, Eq, PartialOrd, Ord)]
 struct Hand {
+    typ: u32,
     cards: Vec<u8>,
-    ct: u32,
     bid: u32,
 }
 
@@ -30,11 +29,11 @@ fn card_type(count: &Vec<u32>) -> u32 {
         return 6;
     } else if count[0] == 4 {
         return 5;
-    } else if count[0] == 3 && count[1] == 2 {
+    } else if count[0..2] == [3, 2] {
         return 4;
     } else if count[0] == 3 {
         return 3;
-    } else if count[0] == 2 && count[1] == 2 {
+    } else if count[0..2] == [2, 2] {
         return 2;
     } else if count[0] == 2 {
         return 1;
@@ -59,23 +58,6 @@ fn get_card_type2(c: &Vec<u8>) -> u32 {
     card_type(&count)
 }
 
-fn compare_hands(h1: &Hand, h2: &Hand) -> Ordering {
-    if h1.ct > h2.ct {
-        return Ordering::Greater;
-    } else if h1.ct < h2.ct {
-        return Ordering::Less;
-    } else {
-        for (e1, e2) in h1.cards.iter().zip(h2.cards.iter()) {
-            if e1 > e2 {
-                return Ordering::Greater;
-            } else if e1 < e2 {
-                return Ordering::Less;
-            }
-        }
-    }
-    Ordering::Equal
-}
-
 fn string_to_card(s: &str, map: &[char]) -> Vec<u8> {
     s.chars()
         .map(|c| map.iter().position(|x| x == &c).unwrap() as u8)
@@ -108,26 +90,26 @@ fn main() {
         hands1.push(Hand {
             cards: cards1.clone(),
             bid: bid.parse().unwrap(),
-            ct: get_card_type1(&cards1),
+            typ: get_card_type1(&cards1),
         });
         hands2.push(Hand {
             cards: cards2.clone(),
             bid: bid.parse().unwrap(),
-            ct: get_card_type2(&cards2),
+            typ: get_card_type2(&cards2),
         });
     }
 
-    hands1.sort_by(compare_hands);
+    hands1.sort();
     let mut res1 = 0;
     for (i, h) in hands1.iter().enumerate() {
-        // println!("{:?} {}", h.cards, h.ct);
+        // println!("{:?} {}", h.cards, h.typ);
         res1 += (i as u32 + 1) * h.bid;
     }
 
-    hands2.sort_by(compare_hands);
+    hands2.sort();
     let mut res2 = 0;
     for (i, h) in hands2.iter().enumerate() {
-        // println!("{:?} {}", h.cards, h.ct);
+        // println!("{:?} {}", h.cards, h.typ);
         res2 += (i as u32 + 1) * h.bid;
     }
 
-- 
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