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Modest speed improvements

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This commit is contained in:
Connor Johnstone
2023-12-01 16:58:31 -07:00
parent 86c583b3b0
commit 6a32039ff0
1 changed files with 69 additions and 11 deletions
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80
day_01/src/lib.rs
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@@ -1,8 +1,6 @@
use std::iter::zip;
const WORD_LIST: [&str; 9] = ["one", "two", "three", "four", "five", "six", "seven", "eight", "nine"];
// const REVERSE_WORD_LIST: [&str; 9] = ["eno", "owt", "eerht", "ruof", "evif", "xis", "neves", "thgie", "enin"];
const DIGIT_LIST: [&str; 9] = ["o1e", "t2o", "t3e", "f4r", "f5e", "s6x", "s7n", "e8t", "n9e"];
const REVERSE_WORD_LIST: [&str; 9] = ["eno", "owt", "eerht", "ruof", "evif", "xis", "neves", "thgie", "enin"];
const DIGIT_LIST: [u32; 9] = [1, 2, 3, 4, 5, 6, 7, 8, 9];
fn find_first_digit(line: &str) -> u32 {
match line.chars().find(|character| { character.is_digit(10) }) {
@@ -18,12 +16,52 @@ fn find_last_digit(line: &str) -> u32 {
}
}
fn replace_with_digits(input: &str) -> String {
let mut output = input.to_string();
for (word, digit) in zip(WORD_LIST, DIGIT_LIST) {
output = output.replace(word, digit).to_string();
fn contains_digit_or_spelled(subline: &str) -> Option<u32> {
if subline.starts_with(WORD_LIST[0]) {
return Some(DIGIT_LIST[0]);
} else if subline.starts_with(WORD_LIST[1]) {
return Some(DIGIT_LIST[1]);
} else if subline.starts_with(WORD_LIST[2]) {
return Some(DIGIT_LIST[2]);
} else if subline.starts_with(WORD_LIST[3]) {
return Some(DIGIT_LIST[3]);
} else if subline.starts_with(WORD_LIST[4]) {
return Some(DIGIT_LIST[4]);
} else if subline.starts_with(WORD_LIST[5]) {
return Some(DIGIT_LIST[5]);
} else if subline.starts_with(WORD_LIST[6]) {
return Some(DIGIT_LIST[6]);
} else if subline.starts_with(WORD_LIST[7]) {
return Some(DIGIT_LIST[7]);
} else if subline.starts_with(WORD_LIST[8]) {
return Some(DIGIT_LIST[8]);
} else {
subline.chars().next().unwrap().to_digit(10)
}
}
fn contains_digit_or_spelled_reverse(subline: &str) -> Option<u32> {
if subline.starts_with(REVERSE_WORD_LIST[0]) {
return Some(DIGIT_LIST[0]);
} else if subline.starts_with(REVERSE_WORD_LIST[1]) {
return Some(DIGIT_LIST[1]);
} else if subline.starts_with(REVERSE_WORD_LIST[2]) {
return Some(DIGIT_LIST[2]);
} else if subline.starts_with(REVERSE_WORD_LIST[3]) {
return Some(DIGIT_LIST[3]);
} else if subline.starts_with(REVERSE_WORD_LIST[4]) {
return Some(DIGIT_LIST[4]);
} else if subline.starts_with(REVERSE_WORD_LIST[5]) {
return Some(DIGIT_LIST[5]);
} else if subline.starts_with(REVERSE_WORD_LIST[6]) {
return Some(DIGIT_LIST[6]);
} else if subline.starts_with(REVERSE_WORD_LIST[7]) {
return Some(DIGIT_LIST[7]);
} else if subline.starts_with(REVERSE_WORD_LIST[8]) {
return Some(DIGIT_LIST[8]);
} else {
subline.chars().next().unwrap().to_digit(10)
}
output
}
pub fn part1(input: &str) -> String {
@@ -39,8 +77,28 @@ pub fn part1(input: &str) -> String {
}
pub fn part2(input: &str) -> String {
let parsed_inputs = &replace_with_digits(input);
part1(parsed_inputs)
let calibration_lines = input
.lines()
.map(|line| {
let mut first = 0;
for i in 0..line.len() {
if let Some(i) = contains_digit_or_spelled(&line[i..]) {
first = i;
break;
}
};
let reversed_line = line.chars().rev().collect::<String>();
let mut last = 0;
for i in 0..line.len() {
if let Some(i) = contains_digit_or_spelled_reverse(&reversed_line[i..]) {
last = i;
break;
}
};
format!("{}{}", first, last).parse::<u32>().unwrap()
})
.collect::<Vec<_>>();
format!("{}", calibration_lines.into_iter().sum::<u32>())
}
pub mod prelude {