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day1 part2 solved

This commit is contained in:
Samuel Ortion 2023-12-01 13:40:17 +01:00
parent d0fbdcd1e2
commit c20eb0ca69
2 changed files with 29 additions and 4 deletions
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2
days/.gitignore vendored
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@ -1,3 +1,5 @@
data
# Generated by Cargo
# will have compiled files and executables
debug/

31
days/01/part2/src/main.rs
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@ -1,3 +1,5 @@
use std::cmp;
use std::collections::HashMap;
use std::fs;
// Extract all numbers, digits and letter written digits
@ -5,6 +7,26 @@ fn extract_numbers(line: &str) -> Vec<u32> {
let written_digits: Vec<&str> = vec![
"one", "two", "three", "four", "five", "six", "seven", "eight", "nine",
];
let mut max_tail_overlaps: HashMap<&str, u32> = HashMap::new();
// Compute the size of the suffix of number i overlaping with prefix of number j:
for suffix_number in &written_digits {
max_tail_overlaps.insert(suffix_number.clone(), 0);
for prefix_number in &written_digits {
if suffix_number != prefix_number {
let mut overlap: u32 = 0;
for i in 0..(cmp::min(prefix_number.len(), suffix_number.len())) {
if suffix_number.chars().nth_back(i) == prefix_number.chars().nth(i) {
overlap += 1;
} else {
break;
}
}
if overlap > max_tail_overlaps[suffix_number] {
max_tail_overlaps.insert(suffix_number, overlap);
}
}
}
}
let mut numbers: Vec<u32> = Vec::new();
let mut current_digit_word: String = "".to_owned();
for character in line.chars() {
@ -19,12 +41,13 @@ fn extract_numbers(line: &str) -> Vec<u32> {
let positions: Vec<(usize, &str)> =
current_digit_word.match_indices(digit_writing).collect();
if positions.len() > 0 {
let start_position = positions[0].0;
let end_position = start_position + word_length;
let current_digit_word_slice = &current_digit_word[end_position..];
current_digit_word = current_digit_word_slice.to_owned();
let digit = index as u32 + 1;
numbers.push(digit);
let start_position = positions[0].0;
let end_position =
start_position + word_length - max_tail_overlaps[digit_writing] as usize;
let current_digit_word_slice = &current_digit_word[end_position..];
current_digit_word = current_digit_word_slice.to_owned();
}
}
}