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day12: added

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This commit is contained in:
Ishan Jain 2023-12-12 15:37:53 +05:30
parent 80f9c4195b
commit e1b8b4fa8b
Signed by: ishan
GPG Key ID: 0506DB2A1CC75C27
5 changed files with 1347 additions and 2 deletions
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1
.gitignore vendored
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/target /target
.aoc_token .aoc_token
todo

168
src/day12/1.rs
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const INPUTS: [&'static str; 2] = [include_str!("./sample.txt"), include_str!("./input.txt")]; #![feature(iter_intersperse)]
#![feature(test)]
extern crate test;
use std::collections::HashMap;
const INPUTS: [&str; 2] = [include_str!("./sample.txt"), include_str!("./input.txt")];
fn process(data: &str) -> usize {
let mut answer = 0;
for line in data.lines() {
let (springs, count) = line.split_once(' ').unwrap();
// 5 ss
// 4 interspersed string
let springs: Vec<char> = springs.chars().collect();
let count: Vec<usize> = count
.split(',')
.map(|x| x.parse::<usize>().unwrap())
.collect();
let total: usize = count.iter().sum();
let mut active = vec![];
let mut map = HashMap::new();
answer += combination_helper(
&springs,
&mut map,
&count,
&mut active,
0,
0,
0,
0,
total,
springs.len(),
);
}
answer
}
fn combination_helper(
expected: &[char],
map: &mut HashMap<(usize, usize, usize, usize), usize>,
groups: &[usize],
active: &mut Vec<char>,
e_idx: usize,
mut g_idx: usize,
inserted: usize,
continugous_length: usize,
target: usize,
max_length: usize,
) -> usize {
if active.len() >= max_length && inserted != target {
return 0;
}
if target - inserted > max_length - active.len() {
return 0;
}
if continugous_length == 0 && active.len() >= 2 && active[active.len() - 2] == '#' {
g_idx += 1;
}
if inserted == target && active.len() == max_length {
return 1;
}
if let Some(v) = map.get(&(e_idx, g_idx, inserted, continugous_length)) {
return *v;
}
let mut sum = 0;
match expected[e_idx] {
'#' if g_idx < groups.len() && continugous_length < groups[g_idx] => {
active.push('#');
sum += combination_helper(
expected,
map,
groups,
active,
e_idx + 1,
g_idx,
inserted + 1,
continugous_length + 1,
target,
max_length,
);
active.pop();
}
'.' => {
active.push('.');
sum += combination_helper(
expected,
map,
groups,
active,
e_idx + 1,
g_idx,
inserted,
0,
target,
max_length,
);
active.pop();
}
'?' => {
if g_idx < groups.len() && continugous_length < groups[g_idx] {
active.push('#');
sum += combination_helper(
expected,
map,
groups,
active,
e_idx + 1,
g_idx,
inserted + 1,
continugous_length + 1,
target,
max_length,
);
active.pop();
}
active.push('.');
sum += combination_helper(
expected,
map,
groups,
active,
e_idx + 1,
g_idx,
inserted,
0,
target,
max_length,
);
active.pop();
}
_ => (),
}
map.insert((e_idx, g_idx, inserted, continugous_length), sum);
sum
}
fn main() {
for input in INPUTS.iter() {
println!("total = {}", process(input));
}
}
#[bench]
fn part1(b: &mut test::Bencher) {
b.iter(|| {
let v = process(INPUTS[INPUTS.len() - 1]);
test::black_box(v);
});
}

174
src/day12/2.rs
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@ -1 +1,173 @@
const INPUTS: [&'static str; 2] = [include_str!("./sample.txt"), include_str!("./input.txt")]; #![feature(iter_intersperse)]
#![feature(test)]
extern crate test;
use std::collections::HashMap;
const INPUTS: [&str; 2] = [include_str!("./sample.txt"), include_str!("./input.txt")];
fn process(data: &str) -> usize {
let mut answer = 0;
for line in data.lines() {
let (springs, count) = line.split_once(' ').unwrap();
// 5 ss
// 4 interspersed string
let springs: Vec<char> = std::iter::repeat(springs)
.intersperse("?")
.take(9)
.flat_map(|x| x.chars().collect::<Vec<char>>())
.collect();
let count: Vec<usize> = count
.split(',')
.map(|x| x.parse::<usize>().unwrap())
.collect();
let l = count.len();
let count: Vec<usize> = count.into_iter().cycle().take(5 * l).collect();
let total: usize = count.iter().sum();
let mut active = vec![];
let mut map = HashMap::new();
answer += combination_helper(
&springs,
&mut map,
&count,
&mut active,
0,
0,
0,
0,
total,
springs.len(),
);
}
answer
}
fn combination_helper(
expected: &[char],
map: &mut HashMap<(usize, usize, usize, usize), usize>,
groups: &[usize],
active: &mut Vec<char>,
e_idx: usize,
mut g_idx: usize,
inserted: usize,
continugous_length: usize,
target: usize,
max_length: usize,
) -> usize {
if active.len() >= max_length && inserted != target {
return 0;
}
if target - inserted > max_length - active.len() {
return 0;
}
if continugous_length == 0 && active.len() >= 2 && active[active.len() - 2] == '#' {
g_idx += 1;
}
if inserted == target && active.len() == max_length {
return 1;
}
if let Some(v) = map.get(&(e_idx, g_idx, inserted, continugous_length)) {
return *v;
}
let mut sum = 0;
match expected[e_idx] {
'#' if g_idx < groups.len() && continugous_length < groups[g_idx] => {
active.push('#');
sum += combination_helper(
expected,
map,
groups,
active,
e_idx + 1,
g_idx,
inserted + 1,
continugous_length + 1,
target,
max_length,
);
active.pop();
}
'.' => {
active.push('.');
sum += combination_helper(
expected,
map,
groups,
active,
e_idx + 1,
g_idx,
inserted,
0,
target,
max_length,
);
active.pop();
}
'?' => {
if g_idx < groups.len() && continugous_length < groups[g_idx] {
active.push('#');
sum += combination_helper(
expected,
map,
groups,
active,
e_idx + 1,
g_idx,
inserted + 1,
continugous_length + 1,
target,
max_length,
);
active.pop();
}
active.push('.');
sum += combination_helper(
expected,
map,
groups,
active,
e_idx + 1,
g_idx,
inserted,
0,
target,
max_length,
);
active.pop();
}
_ => (),
}
map.insert((e_idx, g_idx, inserted, continugous_length), sum);
sum
}
fn main() {
for input in INPUTS.iter() {
println!("total = {}", process(input));
}
}
#[bench]
fn part1(b: &mut test::Bencher) {
b.iter(|| {
let v = process(INPUTS[INPUTS.len() - 1]);
test::black_box(v);
});
}

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src/day12/input.txt Normal file
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6
src/day12/sample.txt Normal file
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???.### 1,1,3
.??..??...?##. 1,1,3
?#?#?#?#?#?#?#? 1,3,1,6
????.#...#... 4,1,1
????.######..#####. 1,6,5
?###???????? 3,2,1