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#![allow(dead_code)]
#![allow(unused_variables)]
#![allow(unused_mut)]
use std::cmp::Ordering;
use std::collections::HashMap;
use std::env;
use std::fs::File;
use std::io::Read;
#[derive(Debug, Clone)]
struct Comp {
i: usize,
comp: Ordering,
val: i32,
next: String,
}
type Comps = Vec<Comp>;
fn name_to_num(c: char) -> usize {
match c {
'x' => return 0,
'm' => return 1,
'a' => return 2,
's' => return 3,
_ => panic!(),
}
}
fn parse_comp(s: &str) -> Comp {
let mut c: Comp = Comp {
i: 0,
comp: Ordering::Equal,
val: 0,
next: "".to_string(),
};
if !s.contains(":") {
c.i = 0;
c.comp = Ordering::Greater;
c.val = -1;
c.next = s.to_string();
return c;
}
let (a, b) = s.split_once(":").unwrap();
if a.contains("<") {
let (i, val) = a.split_once("<").unwrap();
c.comp = Ordering::Less;
c.i = name_to_num(i.chars().next().unwrap());
c.val = val.parse().unwrap();
} else if a.contains(">") {
let (i, val) = a.split_once(">").unwrap();
c.comp = Ordering::Greater;
c.i = name_to_num(i.chars().next().unwrap());
c.val = val.parse().unwrap();
} else {
panic!();
}
c.next = b.to_string();
return c;
}
fn parse_wf(s: &str) -> (&str, Comps) {
let (a, b) = s.split_once('{').unwrap();
let b = b.trim_end_matches('}');
let mut comps: Comps = Vec::new();
for comp in b.split(',') {
comps.push(parse_comp(comp));
}
(a, comps)
}
fn parse_vals(mut s: &str) -> Vec<i32> {
let mut vec: Vec<i32> = Vec::new();
s = &s[1..s.len() - 1];
for mut v in s.split(',') {
v = &v[2..];
let v: u32 = v.parse().unwrap();
vec.push(v as i32);
}
vec
}
fn rec(wf: &str, part: &Vec<i32>, wfs: &HashMap<&str, Comps>) -> bool {
if wf == "R" {
return false;
} else if wf == "A" {
return true;
}
let comps = wfs.get(wf).unwrap();
for comp in comps {
if part[comp.i].cmp(&comp.val) == comp.comp {
return rec(&comp.next, part, wfs);
}
}
panic!();
}
fn main() {
let args: Vec<String> = env::args().collect();
let filename = if args.len() == 1 {
"in/".to_owned() + args[0].split('/').last().unwrap() + ".pzl"
} else {
args[1].clone()
};
let mut f = File::open(filename).expect("cannot open file");
let mut content = String::new();
f.read_to_string(&mut content).expect("cannot read file");
let mut paragraph = content.trim_end().split("\n\n");
let mut workflows: HashMap<&str, Comps> = HashMap::new();
for line in paragraph.next().unwrap().split('\n') {
let (key, val) = parse_wf(line);
workflows.insert(key, val);
}
let mut parts: Vec<Vec<i32>> = Vec::new();
for line in paragraph.next().unwrap().split('\n') {
parts.push(parse_vals(line));
}
let mut res1 = 0;
for part in parts {
if rec("in", &part, &workflows) {
res1 += part.iter().fold(0, |x, y| x + y);
}
}
let mut res2 = 0;
println!("res1: {}", res1);
println!("res2: {}", res2);
}
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