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use std::{vec, fs};
#[derive(Copy, Clone, Debug)]
struct Coord(u32, u32, u32);
fn main() {
let mut numbers: Vec<u32> = vec![];
let mut array: Vec<Vec<char>> = vec![];
let f = fs::read_to_string("input").unwrap();
// Convert file to array
for line in f.lines() {
let xline: Vec<char> = line.chars().collect();
array.push(xline);
}
// No longer mutable
let array = array;
// Make an array the same size for the purpose of number coord tracking and matching
// initialize it with -1 for nothing there
let mut numarray: Vec<Vec<i32>> = vec![vec![-1; array[0].len()]; array.len()];
// Find Numbers
let mut num = false;
let mut numcoords = Coord(0, 0, 0);
let mut yidx = 0;
for y in array.clone() {
let mut xidx = 0;
for x in y {
match x.to_string().parse::<u32>() {
Ok(_) => {
// if num is not set, start recording the number
if !num {
numcoords = Coord(yidx, xidx, 0);
num = true;
}
},
Err(_) => {
// if we were making a number
if num {
num = false;
// handle number being at the end of the line
// and xidx wraps back to 0
if xidx == 0 {
numcoords = Coord(numcoords.0, numcoords.1, (array[0].len() -1) as u32);
} else {
numcoords = Coord(numcoords.0, numcoords.1, xidx - 1);
}
numbers.push(range_to_number(numcoords, &array));
// Set numarray coords to the numidx
let numidx = numbers.len() - 1;
for i in numcoords.1..=numcoords.2 {
numarray[numcoords.0 as usize][i as usize] = numidx as i32;
}
}
},
}
xidx += 1;
}
yidx += 1;
}
// Search for all symbols that are not numbers or '.' and search around them in numarray for anything not -1
const AROUND: [(i8, i8); 8] = [
(0, 1),
(1, 1),
(1, 0),
(-1, 0),
(-1, -1),
(0, -1),
(1, -1),
(-1, 1),
];
let mut outvec = vec![];
let mut gears = 0;
let mut yidx = 0;
for y in array {
let mut xidx = 0;
for c in y {
let ctest = match c.to_string().parse::<u32>() {
Ok(_) => true,
Err(_) => false,
};
// if ctest is a number or '.', then continue
if ctest || c == '.' {
xidx += 1;
continue
}
// Character is a symbol
let mut newgearvec = vec![];
for pos in AROUND {
let i = match numarray.get(u32_calc(yidx, pos.0)) {
Some(n) => {
match n.get(u32_calc(xidx, pos.1)) {
Some(n) => n,
None => &-1,
}
},
None => continue
};
if i > &-1 {
outvec.push(*i)
}
// part two, if also a gear
if i > &-1 && c == '*' {
newgearvec.push(*i);
}
}
// process newgearvec
newgearvec.sort();
newgearvec.dedup();
if newgearvec.len() == 2 {
gears += numbers[newgearvec[0] as usize] * numbers[newgearvec[1] as usize];
}
xidx += 1;
}
yidx += 1;
}
// Get only a single of each number and add them all up
outvec.sort();
outvec.dedup();
let outvec: Vec<u32> = outvec.iter().map(|i| {
match numbers.get(*i as usize) {
Some(n) => *n,
None => 0,
}
}).collect();
// Add It Up
let mut final_num = 0;
for x in outvec {
final_num += x;
}
println!("part one: {}", final_num);
println!("part two: {}", gears);
}
fn u32_calc(x: u32, y: i8) -> usize {
// nothing should matter if x is greater than 0
if x < 1 && y == -1 {
0
} else {
(x as i64 + y as i64) as usize
}
}
fn range_to_number(coords: Coord, array: &Vec<Vec<char>>) -> u32 {
let mut outstring = "".to_string();
for i in coords.1..=coords.2 {
outstring.push(*array.get(coords.0 as usize).unwrap().get(i as usize).unwrap())
}
outstring.parse().unwrap()
}
|
