theoludwig/advent_of_code_2023
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Code Issues Releases Activity

perf: improve day 8 - part 1

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This commit is contained in:
Théo LUDWIG 2024-02-09 08:48:14 +01:00
parent 23bc51e78c
commit ed00f1e3c6
Signed by: theoludwig
GPG Key ID: ADFE5A563D718F3B
1 changed files with 24 additions and 36 deletions
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60
day_8/src/lib.rs
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@ -4,7 +4,7 @@ use std::collections::HashMap;
#[derive(Debug, Default, PartialEq, Eq, Clone)]
pub struct DesertMap {
pub directions: Vec<HorizontalDirection>,
pub nodes: HashMap<String, (String, String)>,
pub nodes: HashMap<String, [String; 2]>,
}
impl FromStr for DesertMap {
@ -33,9 +33,9 @@ impl FromStr for DesertMap {
/// let expected_result = DesertMap {
/// directions: vec![HorizontalDirection::Right, HorizontalDirection::Left],
/// nodes: HashMap::from([
/// (String::from("AAA"), (String::from("BBB"), String::from("CCC"))),
/// (String::from("BBB"), (String::from("DDD"), String::from("EEE"))),
/// (String::from("CCC"), (String::from("ZZZ"), String::from("GGG"))),
/// (String::from("AAA"), [String::from("BBB"), String::from("CCC")]),
/// (String::from("BBB"), [String::from("DDD"), String::from("EEE")]),
/// (String::from("CCC"), [String::from("ZZZ"), String::from("GGG")]),
/// ])
/// };
///
@ -58,10 +58,10 @@ impl FromStr for DesertMap {
.unwrap_or_default()
.replace(['(', ')'], "");
let mut values_line = values_line.split(", ");
let value = (
let value = [
values_line.next().unwrap_or_default().to_string(),
values_line.next().unwrap_or_default().to_string(),
);
];
result.nodes.insert(key.to_string(), value);
}
Ok(result)
@ -71,8 +71,14 @@ impl FromStr for DesertMap {
#[derive(Debug, Default, PartialEq, Eq, Copy, Clone)]
pub enum HorizontalDirection {
#[default]
Left,
Right,
Left = 0,
Right = 1,
}
impl HorizontalDirection {
pub const fn index(&self) -> usize {
*self as usize
}
}
impl From<char> for HorizontalDirection {
@ -89,39 +95,21 @@ const KEY_START: &str = "AAA";
const KEY_END: &str = "ZZZ";
pub fn part_1(input: &str) -> usize {
let desert_map = DesertMap::from_str(input).unwrap_or_default();
let mut desert_map = DesertMap::from_str(input).unwrap_or_default();
let mut steps = 0;
let mut current_step_key = KEY_START.to_string();
let mut current_direction_index: usize = 0;
while current_step_key != KEY_END {
let current_direction = desert_map
.directions
.get(current_direction_index)
.cloned()
.unwrap_or_else(|| {
current_direction_index = 0;
desert_map
.directions
.get(current_direction_index)
.cloned()
.unwrap_or_default()
});
let current_step_value = desert_map
.nodes
.get(&current_step_key)
.cloned()
.unwrap_or_default();
current_step_key = match current_direction {
HorizontalDirection::Left => current_step_value.0.clone(),
HorizontalDirection::Right => current_step_value.1.clone(),
};
current_direction_index += 1;
let direction_index = steps % desert_map.directions.len();
let current_direction = &desert_map.directions[direction_index];
let current_step_value =
if let Some(step_value) = desert_map.nodes.get_mut(&current_step_key) {
step_value
} else {
break;
};
current_step_key = current_step_value[current_direction.index()].to_string();
steps += 1;
}
steps
}