day3
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unintendedfraud
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[package]
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name = "day3"
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version = "0.1.0"
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edition = "2021"
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# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
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[dependencies]
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util = { path = "../util" }
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|
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436........765..............140.......+....................859.............*.........+.................960........668.......................
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....848....../................-.$.....662.........773..*...........895.......591...........................233..............................
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797.........611..........@.186...429..........304*....468.....554....*..........*...960......82.......*810...+.534..660....645...313./......
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|
||||
...............540...........-....447....................987.....305.............379@.707..............670...397...*..842....552.464........
|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
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|
||||
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|
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|
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||||
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|
||||
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||||
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|
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|
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|
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|
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|
||||
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|
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|
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|
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|
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|
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|
||||
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|
||||
@@ -0,0 +1,206 @@
|
||||
#[derive(Debug, Clone, Copy)]
|
||||
struct Number {
|
||||
row_idx: usize,
|
||||
start: usize,
|
||||
end: usize,
|
||||
line_len: usize,
|
||||
value: i32,
|
||||
}
|
||||
|
||||
fn main() {
|
||||
let data_chars = util::get_data_chars("data1.txt");
|
||||
let data_chars2 = util::get_data_chars("data2.txt");
|
||||
|
||||
let sum: i32 = get_sum(&data_chars);
|
||||
let sum2: i32 = get_gear_sum(&data_chars2);
|
||||
|
||||
println!("## Total sum: {} ##", sum);
|
||||
println!("## Total sum2: {} ##", sum2);
|
||||
}
|
||||
|
||||
fn get_gear_sum(data: &Vec<Vec<char>>) -> i32 {
|
||||
let gear_positions = get_gear_positions(data);
|
||||
|
||||
let mut rows: Vec<Vec<Number>> = Vec::new();
|
||||
for (idx, row) in data.iter().enumerate() {
|
||||
rows.push(get_row_numbers(idx, row, data));
|
||||
}
|
||||
|
||||
let mut sum: i32 = 0;
|
||||
|
||||
gear_positions
|
||||
.iter()
|
||||
.map(|pos| get_gear_numbers(pos, &rows))
|
||||
.for_each(|numbers| {
|
||||
if numbers.len() == 2 {
|
||||
sum += numbers[0].value * numbers[1].value;
|
||||
}
|
||||
});
|
||||
|
||||
return sum;
|
||||
}
|
||||
|
||||
fn get_gear_numbers(gear: &(usize, usize), rows: &Vec<Vec<Number>>) -> Vec<Number> {
|
||||
let mut numbers: Vec<Number> = Vec::new();
|
||||
|
||||
for r_idx in 0..rows.len() {
|
||||
for n_idx in 0..rows[r_idx].len() {
|
||||
if is_next_to_gear(gear, &rows[r_idx][n_idx]) {
|
||||
numbers.push(rows[r_idx][n_idx]);
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
return numbers;
|
||||
}
|
||||
|
||||
fn is_next_to_gear(gear: &(usize, usize), n: &Number) -> bool {
|
||||
let start = if n.start > 0 { n.start - 1 } else { 0 };
|
||||
return gear.0.abs_diff(n.row_idx) < 2 && gear.1 >= start && gear.1 <= n.end + 1;
|
||||
}
|
||||
|
||||
fn get_gear_positions(data: &Vec<Vec<char>>) -> Vec<(usize, usize)> {
|
||||
let mut positions: Vec<(usize, usize)> = Vec::new();
|
||||
|
||||
for x in 0..data.len() {
|
||||
for y in 0..data[x].len() {
|
||||
if data[x][y] == '*' {
|
||||
positions.push((x, y));
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
return positions;
|
||||
}
|
||||
|
||||
fn get_sum(data: &Vec<Vec<char>>) -> i32 {
|
||||
let mut sum: i32 = 0;
|
||||
|
||||
for (idx, row) in data.iter().enumerate() {
|
||||
sum += get_row_sum(idx, row, &data);
|
||||
}
|
||||
|
||||
return sum;
|
||||
}
|
||||
|
||||
fn get_row_numbers(row_idx: usize, row: &Vec<char>, data_chars: &Vec<Vec<char>>) -> Vec<Number> {
|
||||
let mut n = get_default_number(row_idx, data_chars[row_idx].len());
|
||||
|
||||
let mut v: Vec<Number> = Vec::new();
|
||||
let mut digits: Vec<char> = Vec::new();
|
||||
|
||||
for (idx, c) in row.iter().enumerate() {
|
||||
if c.is_digit(10) {
|
||||
if digits.len() == 0 {
|
||||
n.start = idx;
|
||||
}
|
||||
|
||||
digits.push(*c);
|
||||
|
||||
if idx == row.len() - 1 {
|
||||
n.end = idx;
|
||||
n.value = maybe_get_number(&n, &digits, data_chars);
|
||||
v.push(n);
|
||||
}
|
||||
} else if digits.len() > 0 {
|
||||
n.end = idx - 1;
|
||||
n.value = maybe_get_number(&n, &digits, data_chars);
|
||||
v.push(n);
|
||||
|
||||
n = get_default_number(row_idx, data_chars[row_idx].len());
|
||||
digits = Vec::new();
|
||||
}
|
||||
}
|
||||
|
||||
return v;
|
||||
}
|
||||
|
||||
fn get_row_sum(row_idx: usize, row: &Vec<char>, data_chars: &Vec<Vec<char>>) -> i32 {
|
||||
let mut n = get_default_number(row_idx, data_chars[row_idx].len());
|
||||
|
||||
let mut digits: Vec<char> = Vec::new();
|
||||
|
||||
let mut sum: i32 = 0;
|
||||
|
||||
for (idx, c) in row.iter().enumerate() {
|
||||
if c.is_digit(10) {
|
||||
if digits.len() == 0 {
|
||||
n.start = idx;
|
||||
}
|
||||
|
||||
digits.push(*c);
|
||||
|
||||
if idx == row.len() - 1 {
|
||||
n.end = idx;
|
||||
sum += maybe_get_number(&n, &digits, data_chars);
|
||||
}
|
||||
} else if digits.len() > 0 {
|
||||
n.end = idx - 1;
|
||||
sum += maybe_get_number(&n, &digits, &data_chars);
|
||||
|
||||
n = get_default_number(row_idx, data_chars[row_idx].len());
|
||||
digits = Vec::new();
|
||||
}
|
||||
}
|
||||
|
||||
return sum;
|
||||
}
|
||||
|
||||
fn maybe_get_number(n: &Number, digits: &Vec<char>, data_chars: &Vec<Vec<char>>) -> i32 {
|
||||
if should_add_number(n, data_chars) {
|
||||
match digits.iter().collect::<String>().parse() {
|
||||
Ok(n) => return n,
|
||||
Err(err) => panic!("failed to parse number {:?}: {:?}", digits, err),
|
||||
}
|
||||
}
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
fn should_add_number(n: &Number, data_chars: &Vec<Vec<char>>) -> bool {
|
||||
let start = if n.start > 0 { n.start - 1 } else { n.start };
|
||||
let end = if n.end < n.line_len - 1 {
|
||||
n.end + 1
|
||||
} else {
|
||||
n.end
|
||||
};
|
||||
|
||||
if n.row_idx > 0 && have_symbols_between(&data_chars[n.row_idx - 1], start, end)
|
||||
|| have_symbols_between(&data_chars[n.row_idx], start, end)
|
||||
|| n.row_idx < n.line_len - 1
|
||||
&& have_symbols_between(&data_chars[n.row_idx + 1], start, end)
|
||||
{
|
||||
return true;
|
||||
}
|
||||
|
||||
return false;
|
||||
}
|
||||
|
||||
fn have_symbols_between(row: &Vec<char>, start: usize, end: usize) -> bool {
|
||||
if row.len() == 0 {
|
||||
return false;
|
||||
}
|
||||
|
||||
for idx in start..end + 1 {
|
||||
if is_symbol(row[idx]) {
|
||||
return true;
|
||||
}
|
||||
}
|
||||
|
||||
return false;
|
||||
}
|
||||
|
||||
// I'm not sure what they mean by symbols
|
||||
fn is_symbol(c: char) -> bool {
|
||||
return c != '.' && !c.is_digit(10);
|
||||
}
|
||||
|
||||
fn get_default_number(row_idx: usize, length: usize) -> Number {
|
||||
return Number {
|
||||
row_idx,
|
||||
start: 0,
|
||||
end: 0,
|
||||
line_len: length,
|
||||
value: 0,
|
||||
};
|
||||
}
|
||||
@@ -1,5 +1,16 @@
|
||||
use std::{fs::File, io::Read};
|
||||
|
||||
pub fn get_data_chars(path: &str) -> Vec<Vec<char>> {
|
||||
let data = get_data(path);
|
||||
|
||||
let mut data_chars: Vec<Vec<char>> = Vec::new();
|
||||
for line in data {
|
||||
data_chars.push(line.chars().collect());
|
||||
}
|
||||
|
||||
return data_chars;
|
||||
}
|
||||
|
||||
pub fn get_data(path: &str) -> Vec<String> {
|
||||
let mut data = match File::open(path) {
|
||||
Ok(file) => file,
|
||||
|
||||
Reference in New Issue
Block a user