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Make day 12 even more rusty.

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Bert Peters
2018-12-13 14:55:30 +01:00
parent 0de6e22a00
commit faf3ad90d9
1 changed files with 8 additions and 21 deletions
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29
2018/src/day12.rs
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@@ -22,21 +22,13 @@ fn char_bool(c: char) -> bool {
} }
fn print_state(state: &State) -> String { fn print_state(state: &State) -> String {
let mut buf = String::with_capacity(state.len()); state.iter().map(|(_, x)| if *x { '#' } else { '.' }).collect()
for &(_, b) in state {
if b {
buf.push('#');
} else {
buf.push('.');
}
}
buf
} }
fn state_from_string(representation: &str, offset: i64) -> State { fn state_from_string(representation: &str, offset: i64) -> State {
Vec::from_iter(representation.chars() representation.chars().enumerate()
.enumerate() .map(|(i, c)| (i as i64 + offset, char_bool(c)))
.map(|(i, c)| (i as i64 + offset, char_bool(c)))) .collect()
} }
impl Day12 { impl Day12 {
@@ -47,11 +39,9 @@ impl Day12 {
fn read_input(&mut self, input: &mut Read) -> State { fn read_input(&mut self, input: &mut Read) -> State {
let state; let state;
let mut reader = BufReader::new(input); let mut reader = BufReader::new(input);
{ let mut line = String::new();
let mut line = String::new(); reader.read_line(&mut line).unwrap();
reader.read_line(&mut line).unwrap(); state = state_from_string(&line["initial state:".len()..line.len()].trim(), 0);
state = state_from_string(&line["initial state:".len()..line.len()].trim(), 0);
}
for line in reader.lines() { for line in reader.lines() {
let line = line.unwrap(); let line = line.unwrap();
@@ -62,10 +52,7 @@ impl Day12 {
let mut index = 0; let mut index = 0;
for c in line.chars().take(5) { for c in line.chars().take(5) {
index <<= 1; index = (index << 1) | char_bool(c) as usize;
if char_bool(c) {
index |= 1;
}
} }
self.productions[index] = char_bool(line.chars().last().unwrap()); self.productions[index] = char_bool(line.chars().last().unwrap());