1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
|
use regex::{Captures, Regex};
use std::io::{self, Read};
fn main() -> io::Result<()> {
let mut program = String::new();
io::stdin().read_to_string(&mut program)?;
let re = Regex::new(r"mul\((\d{1,3}),(\d{1,3})\)").unwrap();
let silver: u64 = re
.captures_iter(&program)
.map(self::execute_mul_capture)
.sum();
let gold_re = Regex::new(r"(mul)\(\d{1,3},\d{1,3}\)|(do)\(\)|(don't)\(\)").unwrap();
let mut captures = gold_re.captures_iter(&program).map(|c| c.extract::<1>());
let mut gold: u64 = 0;
while let Some((func, [name])) = captures.next() {
match name {
"mul" => gold += execute_mul_capture(re.captures(func).unwrap()),
"do" => (),
"don't" => {
while let Some((_, [n])) = captures.next() {
if n == "do" {
break;
}
}
}
_ => unreachable!(),
}
}
println!("silver: {silver}");
println!("gold: {gold}");
return Ok(());
}
fn execute_mul_capture(captures: Captures) -> u64 {
let (_, [x, y]) = captures.extract();
x.parse::<u64>().unwrap() * y.parse::<u64>().unwrap()
}
|
