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#[derive(Debug)]
struct Digit {
value: u32,
s: usize, // start index
f: usize, // start end
}
#[derive(Debug)]
struct Symbol {
elem: char,
i: usize,
}
fn parse(s: &String, border: &i32) -> (Vec<Digit>, Vec<Symbol>) {
let n: i32 = s.len() as i32;
let chars = s.chars().rev();
let mut pos1: i32 = -1;
let mut pos2: i32 = -1;
let mut incr = 1;
let mut digit = 0;
let mut symbols: Vec<Symbol> = vec![];
let mut digits: Vec<Digit> = vec![];
let mut multiples: Vec<usize> = vec![];
for i in 0..150 {
multiples.push(*border as usize * i);
}
for (idx, ch) in chars.enumerate() {
if ch.is_digit(10) {
if pos2 == -1 {
pos2 = n - idx as i32;
} else if multiples.contains(&idx) && pos2 != -1 {
pos1 = n - idx as i32;
digits.push(Digit {
value: digit,
s: pos1 as usize,
f: pos2 as usize,
});
incr = 1;
digit = 0;
pos2 = n - idx as i32;
}
digit += ch.to_digit(10).unwrap() * incr;
incr *= 10;
}
if !ch.is_digit(10) {
if digit != 0 {
pos1 = n - idx as i32;
if pos1 == -1 || pos2 == -1 {
panic!("wtf is that?!");
}
digits.push(Digit {
value: digit,
s: pos1 as usize,
f: pos2 as usize,
})
}
pos2 = -1;
incr = 1;
digit = 0;
if ch != '.' {
symbols.push(Symbol {
elem: ch,
i: n as usize - idx,
})
}
}
}
if digit != 0 {
pos1 = 0;
if pos2 == -1 {
panic!("wtf is that?!");
}
digits.push(Digit {
value: digit,
s: pos1 as usize,
f: pos2 as usize,
})
}
digits.reverse();
symbols.reverse();
(digits, symbols)
}
pub fn part1(input: &str) -> u32 {
let mut res: u32 = 0;
let arr: String = input.split('\n').map(|c| c.chars()).flatten().collect();
let border = input.find('\n').unwrap() as i32;
let (digits, symbols) = parse(&arr, &border);
let mut valid_s: Vec<usize> = Vec::new();
for symbol in &symbols {
valid_s.push(symbol.i - 1);
}
for digit in digits {
// 13 with border=10
// --> 12, 14, 2, 3, 4, 22, 23, 24
let mut discover: Vec<usize> = vec![];
for i in digit.s..digit.f {
let mut js = vec![
i as i32 - 1,
i as i32 + 1,
i as i32 - border - 1,
i as i32 - border - 0,
i as i32 - border + 1,
// i as i32 + border - 1,
i as i32 + border - 0,
i as i32 + border + 1,
];
if digit.f as i32 + 1 >= border {
js.push(i as i32 + border - 1);
}
for j in js {
if j >= 0
&& !((digit.s..digit.f).contains(&(j as usize)))
&& !(discover.contains(&(j as usize)))
{
discover.push(j as usize);
}
}
}
for d in &discover {
if valid_s.contains(&d) {
res += digit.value;
break;
}
}
discover.sort();
}
res
}
// pub fn part2(input: &str) -> u32 {
// let mut res: u32 = 0;
//
// res
// }
#[cfg(test)]
mod tests {
use super::*;
#[test]
fn example_part1() {
let input = include_str!("../example.txt");
let result = part1(input);
assert_eq!(result, 4361);
}
#[test]
fn input_part1() {
let input = include_str!("../input.txt");
let result = part1(input);
assert_eq!(result, 556367);
}
//
// #[test]
// fn example_part2() {
// let input = include_str!("../example.txt");
// let result = part2(input);
// assert_eq!(result, 2286);
// }
//
// #[test]
// fn input_part2() {
// let input = include_str!("../input.txt");
// let result = part2(input);
// assert_eq!(result, 71585);
// }
}
|
