From ea583b8c165d9678e75c881e62beb828dac5dd5f Mon Sep 17 00:00:00 2001
From: nekineki <nekineki@nekineki.net>
Date: Tue, 3 Dec 2024 10:23:57 +0100
Subject: update day02, day03

---
 2024/day03.rs | 39 +++++++++++++++++++--------------------
 1 file changed, 19 insertions(+), 20 deletions(-)

(limited to '2024/day03.rs')

diff --git a/2024/day03.rs b/2024/day03.rs
index 926329c..427ff74 100644
--- a/2024/day03.rs
+++ b/2024/day03.rs
@@ -18,33 +18,32 @@ fn main() {
     f.read_to_string(&mut content).expect("cannot read file");
     let lines = content.trim_end().split("\n");
 
-    let re = Regex::new(r"mul\((?<a>[0-9]+),(?<b>[0-9]+)\)").unwrap();
-    let mut res1 = 0;
-    for line in lines.clone() {
-        res1 += re
-            .captures_iter(line)
-            .map(|caps| {
-                let p = |name| caps.name(name).unwrap().as_str().parse::<i32>().unwrap();
-                p("a") * p("b")
-            })
-            .fold(0, |a, b| a + b);
-    }
+    let re = Regex::new(r"mul\(([0-9]+),([0-9]+)\)").unwrap();
+    let res1 = lines
+        .clone()
+        .map(|line| {
+            re.captures_iter(line)
+                .map(|caps| {
+                    let p = |n| caps.get(n).unwrap().as_str().parse::<i32>().unwrap();
+                    p(1) * p(2)
+                })
+                .sum::<i32>()
+        })
+        .sum::<i32>();
 
-    let re_m = Regex::new(r"^mul\((?<a>[0-9]+),(?<b>[0-9]+)\)").unwrap();
-    let re_do = Regex::new(r"^do\(\)").unwrap();
-    let re_dont = Regex::new(r"^don't\(\)").unwrap();
+    let re2 = Regex::new(r"^mul\(([0-9]+),([0-9]+)\)").unwrap();
     let mut res2 = 0;
     let mut valid = true;
     for line in lines {
         for i in 0..line.len() {
-            if re_do.is_match(&line[i..]) {
+            if line[i..].starts_with("do()") {
                 valid = true;
-            } else if re_dont.is_match(&line[i..]) {
+            } else if line[i..].starts_with("don't()") {
                 valid = false;
-            } else if valid && re_m.is_match(&line[i..]) {
-                let cap = re_m.captures(&line[i..]).unwrap();
-                let p = |name| cap.name(name).unwrap().as_str().parse::<i32>().unwrap();
-                res2 += p("a") * p("b");
+            } else if valid && re2.is_match(&line[i..]) {
+                let cap = re2.captures(&line[i..]).unwrap();
+                let p = |n| cap.get(n).unwrap().as_str().parse::<i32>().unwrap();
+                res2 += p(1) * p(2);
             }
         }
     }
-- 
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