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#![allow(dead_code)]
#![allow(unused_variables)]
#![allow(unused_mut)]
use std::env;
use std::fs::File;
use std::io::Read;
fn is_valid(update: &Vec<usize>, rules: &Vec<(usize, usize)>) -> bool {
for (i, n) in update.iter().enumerate() {
for (l, r) in rules {
if n == l {
if let Some(pr) = update.iter().position(|a| a == r) {
if pr < i {
return false;
}
}
}
}
}
true
}
fn make_valid(update: &Vec<usize>, rules: &Vec<(usize, usize)>) -> Vec<usize> {
let mut uv = update.clone();
for i in 0..uv.len() {
let n = uv[i];
for (l, r) in rules {
if n == *l {
if let Some(pr) = uv.iter().position(|a| a == r) {
if pr < i {
uv[pr] = n;
uv[i] = *r;
break;
}
}
}
}
}
uv
}
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 (paragraph1, paragraph2) = content.trim_end().split_once("\n\n").unwrap();
let paragraph1 = paragraph1.trim_end().split("\n");
let paragraph2 = paragraph2.trim_end().split("\n");
let mut rules: Vec<(usize, usize)> = Vec::new();
for line in paragraph1 {
let (a, b) = line.split_once("|").unwrap();
rules.push((a.parse().unwrap(), b.parse().unwrap()));
}
//println!("{:?}", rules);
let mut updates: Vec<Vec<usize>> = Vec::new();
for line in paragraph2 {
updates.push(line.split(",").map(|a| a.parse().unwrap()).collect());
}
//println!("{:?}", updates);
let mut res1 = 0;
let mut res2 = 0;
for u in updates {
let ret = is_valid(&u, &rules);
if ret {
res1 += u[u.len() / 2];
} else {
let mut uv = u;
while !is_valid(&uv, &rules) {
uv = make_valid(&uv, &rules);
}
res2 += uv[uv.len() / 2];
}
}
println!("res1: {}", res1);
println!("res2: {}", res2);
assert_eq!(res1, 4766);
assert_eq!(res2, 6257);
}
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