Compare commits
No commits in common. "72426e9163603167bf27f7e4fcdf1947c625ac47" and "0e475d9264b1147d02f78c6dc5a93010d94ccaa2" have entirely different histories.
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339
2022/src/day5.rs
339
2022/src/day5.rs
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|
@ -1,339 +0,0 @@
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use nom::{
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||||
bytes::complete::tag,
|
||||
character::complete::{anychar, char, space0, space1, u8},
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||||
combinator::eof,
|
||||
multi::{many0, many1, separated_list0, separated_list1},
|
||||
sequence::{delimited, terminated},
|
||||
IResult, Parser,
|
||||
};
|
||||
use std::fmt::Debug;
|
||||
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||||
const INPUT: &str = include_str!("../data/day5.txt");
|
||||
|
||||
pub fn part1() -> String {
|
||||
let (stacks, commands) = input(INPUT);
|
||||
tops(run_commands(stacks, commands))
|
||||
}
|
||||
|
||||
pub fn part2() -> String {
|
||||
let (stacks, commands) = input(INPUT);
|
||||
tops(run_commands_multicrate(stacks, commands))
|
||||
}
|
||||
|
||||
fn run_commands(stacks: Stacks<char>, commands: Vec<Command>) -> Stacks<char> {
|
||||
commands
|
||||
.into_iter()
|
||||
.fold(stacks, |stacks, command| stacks.run_command(command))
|
||||
}
|
||||
|
||||
fn run_commands_multicrate(stacks: Stacks<char>, commands: Vec<Command>) -> Stacks<char> {
|
||||
commands.into_iter().fold(stacks, |stacks, command| {
|
||||
stacks.run_command_multicrate(command)
|
||||
})
|
||||
}
|
||||
|
||||
fn tops(stacks: Stacks<char>) -> String {
|
||||
stacks
|
||||
.0
|
||||
.iter()
|
||||
.map(|stack| stack.top())
|
||||
.filter_map(|v| v)
|
||||
.collect::<String>()
|
||||
}
|
||||
|
||||
fn print_matrix(matrix: &Matrix<Option<char>>) {
|
||||
for row in matrix.data.clone() {
|
||||
for val in row {
|
||||
print!(" {} ", val.unwrap_or(' '));
|
||||
}
|
||||
println!("");
|
||||
}
|
||||
}
|
||||
|
||||
#[derive(Clone, Debug, PartialEq)]
|
||||
struct Command {
|
||||
count: u8,
|
||||
source: u8,
|
||||
dest: u8,
|
||||
}
|
||||
|
||||
#[derive(Clone, Debug, PartialEq)]
|
||||
struct Matrix<T> {
|
||||
rows: usize,
|
||||
cols: usize,
|
||||
data: Vec<Vec<T>>,
|
||||
}
|
||||
|
||||
impl<T: Clone + Copy + Debug> Matrix<T> {
|
||||
fn new(data: Vec<Vec<T>>) -> Self {
|
||||
let rows = data.len();
|
||||
let cols = data
|
||||
.iter()
|
||||
.fold(0, |max, row| std::cmp::max(max, row.len()));
|
||||
Self { rows, cols, data }
|
||||
}
|
||||
|
||||
fn rotate_cw(self) -> Self {
|
||||
let mut data = Vec::new();
|
||||
for col_idx in 0..self.cols {
|
||||
let mut row = vec![];
|
||||
for row_idx in 0..self.rows {
|
||||
row.push(self.data[self.rows - row_idx - 1][col_idx]);
|
||||
}
|
||||
data.push(row);
|
||||
}
|
||||
|
||||
Self {
|
||||
rows: self.cols,
|
||||
cols: self.rows,
|
||||
data,
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
#[derive(Debug)]
|
||||
struct Stack<T>(Vec<T>);
|
||||
|
||||
impl<T: Clone + Copy> Stack<T> {
|
||||
fn from_option_vec(data: Vec<Option<T>>) -> Self {
|
||||
Stack(data.into_iter().filter_map(|v| v).collect::<Vec<T>>())
|
||||
}
|
||||
|
||||
fn push(&mut self, val: T) {
|
||||
self.0.push(val);
|
||||
}
|
||||
|
||||
fn pop(&mut self) -> Option<T> {
|
||||
self.0.pop()
|
||||
}
|
||||
|
||||
fn top(&self) -> Option<T> {
|
||||
if self.0.len() > 0 {
|
||||
Some(self.0[self.0.len() - 1])
|
||||
} else {
|
||||
None
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
#[derive(Debug)]
|
||||
struct Stacks<T>(Vec<Stack<T>>);
|
||||
|
||||
impl<T: Clone + Copy> Stacks<T> {
|
||||
fn run_command(mut self, cmd: Command) -> Self {
|
||||
let Command {
|
||||
count,
|
||||
source,
|
||||
dest,
|
||||
} = cmd;
|
||||
(0..count).for_each(|_| {
|
||||
let val = self.0[(source - 1) as usize].pop().unwrap();
|
||||
self.0[(dest - 1) as usize].push(val);
|
||||
});
|
||||
self
|
||||
}
|
||||
|
||||
fn run_command_multicrate(mut self, cmd: Command) -> Self {
|
||||
let Command {
|
||||
count,
|
||||
source,
|
||||
dest,
|
||||
} = cmd;
|
||||
|
||||
let mut stack = Vec::new();
|
||||
(0..count).for_each(|_| {
|
||||
let val = self.0[(source - 1) as usize].pop().unwrap();
|
||||
stack.push(val);
|
||||
});
|
||||
while stack.len() > 0 {
|
||||
self.0[(dest - 1) as usize].push(stack.pop().unwrap());
|
||||
}
|
||||
|
||||
self
|
||||
}
|
||||
}
|
||||
|
||||
fn input(data: &str) -> (Stacks<char>, Vec<Command>) {
|
||||
let (_, result) = parser(data).unwrap();
|
||||
result
|
||||
}
|
||||
|
||||
fn parser(input: &str) -> IResult<&str, (Stacks<char>, Vec<Command>)> {
|
||||
let (input, rows) = many0(parse_crate_row)(input)?;
|
||||
|
||||
let (input, _) = parse_stack_numbers(input)?;
|
||||
|
||||
let (input, _) = space0(input)?;
|
||||
let (input, _) = tag("\n")(input)?;
|
||||
|
||||
let (input, commands) = many1(terminated(parse_command, tag("\n").or(eof)))(input)?;
|
||||
|
||||
let matrix = Matrix::new(rows);
|
||||
|
||||
let stacks = matrix
|
||||
.rotate_cw()
|
||||
.data
|
||||
.into_iter()
|
||||
.map(|v| Stack::from_option_vec(v.clone()))
|
||||
.collect::<Vec<Stack<char>>>();
|
||||
Ok((input, (Stacks(stacks), commands)))
|
||||
}
|
||||
|
||||
fn parse_command(input: &str) -> IResult<&str, Command> {
|
||||
let (input, _) = tag("move ")(input)?;
|
||||
let (input, count) = u8(input)?;
|
||||
let (input, _) = tag(" from ")(input)?;
|
||||
let (input, source) = u8(input)?;
|
||||
let (input, _) = tag(" to ")(input)?;
|
||||
let (input, dest) = u8(input)?;
|
||||
|
||||
Ok((
|
||||
input,
|
||||
Command {
|
||||
count,
|
||||
source,
|
||||
dest,
|
||||
},
|
||||
))
|
||||
}
|
||||
|
||||
fn parse_stack_numbers(input: &str) -> IResult<&str, usize> {
|
||||
let (input, _) = space0(input)?;
|
||||
let (input, stack_numbers) = separated_list1(space1, u8)(input)?;
|
||||
let (input, _) = space0(input)?;
|
||||
let (input, _) = tag("\n")(input)?;
|
||||
Ok((input, stack_numbers.len()))
|
||||
}
|
||||
|
||||
fn parse_crate_row(input: &str) -> IResult<&str, Vec<Option<char>>> {
|
||||
let (input, cells) = terminated(separated_list0(char(' '), parse_cell), tag("\n"))(input)?;
|
||||
Ok((input, cells))
|
||||
}
|
||||
|
||||
fn parse_cell(input: &str) -> IResult<&str, Option<char>> {
|
||||
parse_crate.or(parse_space).parse(input)
|
||||
}
|
||||
|
||||
fn parse_crate(input: &str) -> IResult<&str, Option<char>> {
|
||||
delimited(char('['), anychar, char(']'))
|
||||
.map(|c| Some(c))
|
||||
.parse(input)
|
||||
}
|
||||
|
||||
fn parse_space(input: &str) -> IResult<&str, Option<char>> {
|
||||
tag(" ").map(|_| None).parse(input)
|
||||
}
|
||||
|
||||
#[cfg(test)]
|
||||
mod test {
|
||||
use super::*;
|
||||
|
||||
const TEST_DATA: &str = " [D]
|
||||
[N] [C]
|
||||
[Z] [M] [P]
|
||||
1 2 3
|
||||
|
||||
move 1 from 2 to 1
|
||||
move 3 from 1 to 3
|
||||
move 2 from 2 to 1
|
||||
move 1 from 1 to 2";
|
||||
|
||||
fn with_input<F>(test: F)
|
||||
where
|
||||
F: Fn((Stacks<char>, Vec<Command>)) -> () + std::panic::UnwindSafe,
|
||||
{
|
||||
test(input(TEST_DATA));
|
||||
}
|
||||
|
||||
#[test]
|
||||
fn it_can_parse_test_data() {
|
||||
with_input(|(stacks, commands)| {
|
||||
assert_eq!(stacks.0[0].0, vec!['Z', 'N']);
|
||||
assert_eq!(stacks.0[1].0, vec!['M', 'C', 'D']);
|
||||
assert_eq!(stacks.0[2].0, vec!['P']);
|
||||
|
||||
assert_eq!(commands.len(), 4);
|
||||
assert_eq!(
|
||||
commands[0],
|
||||
Command {
|
||||
count: 1,
|
||||
source: 2,
|
||||
dest: 1
|
||||
}
|
||||
);
|
||||
assert_eq!(
|
||||
commands[3],
|
||||
Command {
|
||||
count: 1,
|
||||
source: 1,
|
||||
dest: 2
|
||||
}
|
||||
);
|
||||
});
|
||||
}
|
||||
|
||||
#[test]
|
||||
fn it_can_follow_commands() {
|
||||
with_input(|(stacks, commands)| {
|
||||
let stacks = stacks.run_command(commands[0].clone());
|
||||
assert_eq!(stacks.0[0].0, vec!['Z', 'N', 'D']);
|
||||
assert_eq!(stacks.0[1].0, vec!['M', 'C']);
|
||||
assert_eq!(stacks.0[2].0, vec!['P']);
|
||||
});
|
||||
|
||||
with_input(|(stacks, commands)| {
|
||||
let stacks = run_commands(stacks, commands);
|
||||
assert_eq!(stacks.0[0].0, vec!['C']);
|
||||
assert_eq!(stacks.0[1].0, vec!['M']);
|
||||
assert_eq!(stacks.0[2].0, vec!['P', 'D', 'N', 'Z']);
|
||||
});
|
||||
}
|
||||
|
||||
#[test]
|
||||
fn it_can_follow_multicrate_commands() {
|
||||
with_input(|(stacks, commands)| {
|
||||
let stacks = stacks.run_command_multicrate(commands[0].clone());
|
||||
assert_eq!(stacks.0[0].0, vec!['Z', 'N', 'D']);
|
||||
assert_eq!(stacks.0[1].0, vec!['M', 'C']);
|
||||
assert_eq!(stacks.0[2].0, vec!['P']);
|
||||
});
|
||||
|
||||
with_input(|(stacks, commands)| {
|
||||
let stacks = run_commands_multicrate(stacks, commands);
|
||||
assert_eq!(stacks.0[0].0, vec!['M']);
|
||||
assert_eq!(stacks.0[1].0, vec!['C']);
|
||||
assert_eq!(stacks.0[2].0, vec!['P', 'Z', 'N', 'D']);
|
||||
});
|
||||
}
|
||||
|
||||
#[test]
|
||||
fn it_can_find_tops() {
|
||||
with_input(|(stacks, commands)| {
|
||||
let stacks = run_commands(stacks, commands);
|
||||
assert_eq!(tops(stacks), "CMZ");
|
||||
});
|
||||
}
|
||||
|
||||
#[test]
|
||||
fn it_can_rotate_symmetrix_matrix() {
|
||||
let matrix = Matrix::new(vec![vec!['A', 'B'], vec!['C', 'D']]);
|
||||
let expected = Matrix::new(vec![vec!['C', 'A'], vec!['D', 'B']]);
|
||||
assert_eq!(matrix.rotate_cw(), expected);
|
||||
}
|
||||
|
||||
#[test]
|
||||
fn it_can_rotate_asymmetric_matrix() {
|
||||
let matrix = Matrix::new(vec![
|
||||
vec![Some('A'), Some('B'), Some('C')],
|
||||
vec![Some('D'), Some('E'), Some('F')],
|
||||
]);
|
||||
let expected = Matrix::new(vec![
|
||||
vec![Some('D'), Some('A')],
|
||||
vec![Some('E'), Some('B')],
|
||||
vec![Some('F'), Some('C')],
|
||||
]);
|
||||
print_matrix(&matrix);
|
||||
print_matrix(&matrix.clone().rotate_cw());
|
||||
assert_eq!(matrix.rotate_cw(), expected);
|
||||
}
|
||||
}
|
||||
|
|
@ -2,7 +2,6 @@ mod day1;
|
|||
mod day2;
|
||||
mod day3;
|
||||
mod day4;
|
||||
mod day5;
|
||||
|
||||
fn main() {
|
||||
let day = std::env::args().skip(1).next();
|
||||
|
|
@ -16,8 +15,6 @@ fn main() {
|
|||
Some("3b") => day3::part2(),
|
||||
Some("4a") => day4::part1(),
|
||||
Some("4b") => day4::part2(),
|
||||
Some("5a") => day5::part1(),
|
||||
Some("5b") => day5::part2(),
|
||||
_ => panic!("unrecognized day"),
|
||||
};
|
||||
|
||||
|
|
|
|||
Loading…
Reference in New Issue