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day14.rs
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day14.rs
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use std::fs::File;
use std::io::Read;
use std::collections::HashMap;
#[derive(Debug)]
pub struct Chemical {
ingredients: Vec<(u128,String)>,
batch: u128,
}
impl Chemical {
pub fn new (v: &[(u128,String)], n: u128) -> Chemical {
Chemical {
ingredients: v.to_vec(),
batch: n,
}
}
}
pub struct Chemicalizer {
chemicals: HashMap<String,Chemical>,
surplus: HashMap<String,u128>,
}
impl Chemicalizer {
pub fn new (hm: HashMap<String,Chemical>) -> Chemicalizer {
let mut surplus = HashMap::new();
for (k,_) in &hm {
surplus.insert(k.to_owned(),0);
}
Chemicalizer {
chemicals: hm,
surplus,
}
}
pub fn generate<'a> (&'a mut self, s: &'a str, n: u128) -> u128 {
let mut x = 0;
let mut is = Vec::new();
is.push((n,s));
while !is.is_empty() {
let (sn,s) = is.remove(0);
let c = self.chemicals.get(s).unwrap();
for ii in 0..c.ingredients.len() {
let n = sn*c.ingredients[ii].0;
let i = &c.ingredients[ii].1;
if i == "ORE" {
x += n as u128;
}
else {
if self.surplus[i] < n {
let r = (((n - self.surplus[i]) as f64)/(self.chemicals[i].batch as f64)).ceil() as u128;
*self.surplus.get_mut(i).unwrap() += r*self.chemicals[i].batch;
is.push((r,i));
}
*self.surplus.get_mut(i).unwrap() -= n;
}
}
}
//println!("{:?}",self.surplus);
x
}
}
fn parse (s: &str) -> HashMap<String,Chemical> {
let mut hm = HashMap::new();
let mut is = Vec::new();
let mut r = (0,String::new());
let mut n = String::new();
for c in s.chars() {
match c as u8 {
10 => {
hm.insert(r.1.to_owned(),Chemical::new(&is,r.0));
r.0 = 0;
r.1 = String::new();
is.clear();
},
44 => {
is.push((r.0,r.1.to_owned()));
r.0 = 0;
r.1.clear();
},
48..=57 => n.push(c),
61 => {
is.push((r.0,r.1.to_owned()));
r.0 = 0;
r.1.clear();
},
65..=90 => {
if r.1.is_empty() {
r.0 = str::parse(&n).unwrap();
n.clear();
}
r.1.push(c);
},
_ => (),
};
}
hm
}
fn main () -> std::io::Result<()> {
let mut data = String::new();
let mut file = File::open("input14")?;
file.read_to_string(&mut data)?;
let mut c = Chemicalizer::new(parse(&data));
let mut f_min = 1_000_000_000_000/c.generate("FUEL",1);
let mut f_max = 2*f_min;
let mut f_avg = (f_min + f_max)/2;
let mut o = c.generate("FUEL",f_avg);
while f_max - f_min > 1 {
if o == 1_000_000_000_000 {
break;
}
else if o < 1_000_000_000_000 {
let f = f_avg;
f_avg = (f_avg + f_max)/2;
f_min = f;
}
else {
let f = f_avg;
f_avg = (f_min + f_avg)/2;
f_max = f;
}
c = Chemicalizer::new(parse(&data));
o = c.generate("FUEL",f_avg);
println!("{}",o);
}
println!("{}",f_avg);
Ok(())
}