diff options
Diffstat (limited to 'aoc21')
| -rw-r--r-- | aoc21/Cargo.lock | 98 | ||||
| -rw-r--r-- | aoc21/Cargo.toml | 7 | ||||
| -rw-r--r-- | aoc21/input.txt | 100 | ||||
| -rw-r--r-- | aoc21/src/main.rs | 233 |
4 files changed, 0 insertions, 438 deletions
diff --git a/aoc21/Cargo.lock b/aoc21/Cargo.lock deleted file mode 100644 index 9a1075b..0000000 --- a/aoc21/Cargo.lock +++ /dev/null @@ -1,98 +0,0 @@ -[root] -name = "aoc21" -version = "0.1.0" -dependencies = [ - "regex 0.1.80 (registry+https://github.com/rust-lang/crates.io-index)", -] - -[[package]] -name = "aho-corasick" -version = "0.5.3" -source = "registry+https://github.com/rust-lang/crates.io-index" -dependencies = [ - "memchr 0.1.11 (registry+https://github.com/rust-lang/crates.io-index)", -] - -[[package]] -name = "kernel32-sys" -version = "0.2.2" -source = "registry+https://github.com/rust-lang/crates.io-index" -dependencies = [ - "winapi 0.2.8 (registry+https://github.com/rust-lang/crates.io-index)", - "winapi-build 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)", -] - -[[package]] -name = "libc" -version = "0.2.18" -source = "registry+https://github.com/rust-lang/crates.io-index" - -[[package]] -name = "memchr" -version = "0.1.11" -source = "registry+https://github.com/rust-lang/crates.io-index" -dependencies = [ - "libc 0.2.18 (registry+https://github.com/rust-lang/crates.io-index)", -] - -[[package]] -name = "regex" -version = "0.1.80" -source = "registry+https://github.com/rust-lang/crates.io-index" -dependencies = [ - "aho-corasick 0.5.3 (registry+https://github.com/rust-lang/crates.io-index)", - "memchr 0.1.11 (registry+https://github.com/rust-lang/crates.io-index)", - "regex-syntax 0.3.9 (registry+https://github.com/rust-lang/crates.io-index)", - "thread_local 0.2.7 (registry+https://github.com/rust-lang/crates.io-index)", - "utf8-ranges 0.1.3 (registry+https://github.com/rust-lang/crates.io-index)", -] - -[[package]] -name = "regex-syntax" -version = "0.3.9" -source = "registry+https://github.com/rust-lang/crates.io-index" - -[[package]] -name = "thread-id" -version = "2.0.0" -source = "registry+https://github.com/rust-lang/crates.io-index" -dependencies = [ - "kernel32-sys 0.2.2 (registry+https://github.com/rust-lang/crates.io-index)", - "libc 0.2.18 (registry+https://github.com/rust-lang/crates.io-index)", -] - -[[package]] -name = "thread_local" -version = "0.2.7" -source = "registry+https://github.com/rust-lang/crates.io-index" -dependencies = [ - "thread-id 2.0.0 (registry+https://github.com/rust-lang/crates.io-index)", -] - -[[package]] -name = "utf8-ranges" -version = "0.1.3" -source = "registry+https://github.com/rust-lang/crates.io-index" - -[[package]] -name = "winapi" -version = "0.2.8" -source = "registry+https://github.com/rust-lang/crates.io-index" - -[[package]] -name = "winapi-build" -version = "0.1.1" -source = "registry+https://github.com/rust-lang/crates.io-index" - -[metadata] -"checksum aho-corasick 0.5.3 (registry+https://github.com/rust-lang/crates.io-index)" = "ca972c2ea5f742bfce5687b9aef75506a764f61d37f8f649047846a9686ddb66" -"checksum kernel32-sys 0.2.2 (registry+https://github.com/rust-lang/crates.io-index)" = "7507624b29483431c0ba2d82aece8ca6cdba9382bff4ddd0f7490560c056098d" -"checksum libc 0.2.18 (registry+https://github.com/rust-lang/crates.io-index)" = "a51822fc847e7a8101514d1d44e354ba2ffa7d4c194dcab48870740e327cac70" -"checksum memchr 0.1.11 (registry+https://github.com/rust-lang/crates.io-index)" = "d8b629fb514376c675b98c1421e80b151d3817ac42d7c667717d282761418d20" -"checksum regex 0.1.80 (registry+https://github.com/rust-lang/crates.io-index)" = "4fd4ace6a8cf7860714a2c2280d6c1f7e6a413486c13298bbc86fd3da019402f" -"checksum regex-syntax 0.3.9 (registry+https://github.com/rust-lang/crates.io-index)" = "f9ec002c35e86791825ed294b50008eea9ddfc8def4420124fbc6b08db834957" -"checksum thread-id 2.0.0 (registry+https://github.com/rust-lang/crates.io-index)" = "a9539db560102d1cef46b8b78ce737ff0bb64e7e18d35b2a5688f7d097d0ff03" -"checksum thread_local 0.2.7 (registry+https://github.com/rust-lang/crates.io-index)" = "8576dbbfcaef9641452d5cf0df9b0e7eeab7694956dd33bb61515fb8f18cfdd5" -"checksum utf8-ranges 0.1.3 (registry+https://github.com/rust-lang/crates.io-index)" = "a1ca13c08c41c9c3e04224ed9ff80461d97e121589ff27c753a16cb10830ae0f" -"checksum winapi 0.2.8 (registry+https://github.com/rust-lang/crates.io-index)" = "167dc9d6949a9b857f3451275e911c3f44255842c1f7a76f33c55103a909087a" -"checksum winapi-build 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)" = "2d315eee3b34aca4797b2da6b13ed88266e6d612562a0c46390af8299fc699bc" diff --git a/aoc21/Cargo.toml b/aoc21/Cargo.toml deleted file mode 100644 index bc0d468..0000000 --- a/aoc21/Cargo.toml +++ /dev/null @@ -1,7 +0,0 @@ -[package] -name = "aoc21" -version = "0.1.0" -authors = ["Justin Worthe <justin.worthe@gmail.com>"] - -[dependencies] -regex = "0.1"
\ No newline at end of file diff --git a/aoc21/input.txt b/aoc21/input.txt deleted file mode 100644 index ebd7d52..0000000 --- a/aoc21/input.txt +++ /dev/null @@ -1,100 +0,0 @@ -rotate based on position of letter d -move position 1 to position 6 -swap position 3 with position 6 -rotate based on position of letter c -swap position 0 with position 1 -rotate right 5 steps -rotate left 3 steps -rotate based on position of letter b -swap position 0 with position 2 -rotate based on position of letter g -rotate left 0 steps -reverse positions 0 through 3 -rotate based on position of letter a -rotate based on position of letter h -rotate based on position of letter a -rotate based on position of letter g -rotate left 5 steps -move position 3 to position 7 -rotate right 5 steps -rotate based on position of letter f -rotate right 7 steps -rotate based on position of letter a -rotate right 6 steps -rotate based on position of letter a -swap letter c with letter f -reverse positions 2 through 6 -rotate left 1 step -reverse positions 3 through 5 -rotate based on position of letter f -swap position 6 with position 5 -swap letter h with letter e -move position 1 to position 3 -swap letter c with letter h -reverse positions 4 through 7 -swap letter f with letter h -rotate based on position of letter f -rotate based on position of letter g -reverse positions 3 through 4 -rotate left 7 steps -swap letter h with letter a -rotate based on position of letter e -rotate based on position of letter f -rotate based on position of letter g -move position 5 to position 0 -rotate based on position of letter c -reverse positions 3 through 6 -rotate right 4 steps -move position 1 to position 2 -reverse positions 3 through 6 -swap letter g with letter a -rotate based on position of letter d -rotate based on position of letter a -swap position 0 with position 7 -rotate left 7 steps -rotate right 2 steps -rotate right 6 steps -rotate based on position of letter b -rotate right 2 steps -swap position 7 with position 4 -rotate left 4 steps -rotate left 3 steps -swap position 2 with position 7 -move position 5 to position 4 -rotate right 3 steps -rotate based on position of letter g -move position 1 to position 2 -swap position 7 with position 0 -move position 4 to position 6 -move position 3 to position 0 -rotate based on position of letter f -swap letter g with letter d -swap position 1 with position 5 -reverse positions 0 through 2 -swap position 7 with position 3 -rotate based on position of letter g -swap letter c with letter a -rotate based on position of letter g -reverse positions 3 through 5 -move position 6 to position 3 -swap letter b with letter e -reverse positions 5 through 6 -move position 6 to position 7 -swap letter a with letter e -swap position 6 with position 2 -move position 4 to position 5 -rotate left 5 steps -swap letter a with letter d -swap letter e with letter g -swap position 3 with position 7 -reverse positions 0 through 5 -swap position 5 with position 7 -swap position 1 with position 7 -swap position 1 with position 7 -rotate right 7 steps -swap letter f with letter a -reverse positions 0 through 7 -rotate based on position of letter d -reverse positions 2 through 4 -swap position 7 with position 1 -swap letter a with letter h diff --git a/aoc21/src/main.rs b/aoc21/src/main.rs deleted file mode 100644 index 1366f1e..0000000 --- a/aoc21/src/main.rs +++ /dev/null @@ -1,233 +0,0 @@ -extern crate regex; - -use std::io::BufReader; -use std::io::prelude::*; -use std::fs::File; -use std::collections::VecDeque; - -use regex::Regex; - -fn main() { - let password = "abcdefgh".to_string(); - let program = read_file(); - let scrambled = scramble_password(password, &program); - println!("Scrambled password is {}", scrambled); - let unscrambled = unscramble_password(scrambled, &program); - println!("Which unscrambles to {}", unscrambled); - - let other_scrambled = "fbgdceah".to_string(); - let other_unscrambled = unscramble_password(other_scrambled, &program); - - println!("Decrypted easter bunny password is {}", other_unscrambled); -} - -fn read_file() -> Vec<String> { - let file = BufReader::new(File::open("input.txt").unwrap()); - file.lines() - .map(|line| line.unwrap().trim().to_string()) - .filter(|line| line.len() > 0) - .collect() -} - -fn scramble_password(password: String, program: &Vec<String>) -> String { - let mut pass = password.chars().collect::<VecDeque<_>>(); - - let instructions = scramble_instruction_set(); - - for line in program { - for &(ref reg, ref func) in &instructions { - let captures = reg.captures(line.as_ref()); - if captures.is_some() { - func(&mut pass, captures.unwrap()); - } - } - } - - pass.iter().cloned().collect() -} - -fn unscramble_password(password: String, program: &Vec<String>) -> String { - let mut pass = password.chars().collect::<VecDeque<_>>(); - - let instructions = unscramble_instruction_set(); - - let mut backwards_program = program.clone(); - backwards_program.reverse(); - for line in backwards_program { - for &(ref reg, ref func) in &instructions { - let captures = reg.captures(line.as_ref()); - if captures.is_some() { - func(&mut pass, captures.unwrap()); - } - } - } - - pass.iter().cloned().collect() -} - -fn scramble_instruction_set() -> Vec<(Regex, fn(&mut VecDeque<char>, regex::Captures))> { - let mut instructions : Vec<(Regex, fn(&mut VecDeque<char>, regex::Captures))> = Vec::new(); - instructions.push((Regex::new(r"swap position (\d+) with position (\d+)").unwrap(), swap_pos)); - instructions.push((Regex::new(r"swap letter ([a-z]) with letter ([a-z])").unwrap(), swap_let)); - instructions.push((Regex::new(r"rotate left (\d+) step").unwrap(), rotate_left)); - instructions.push((Regex::new(r"rotate right (\d+) step").unwrap(), rotate_right)); - instructions.push((Regex::new(r"rotate based on position of letter ([a-z])").unwrap(), rotate_pos)); - instructions.push((Regex::new(r"reverse positions (\d+) through (\d+)").unwrap(), reverse_sub)); - instructions.push((Regex::new(r"move position (\d+) to position (\d+)").unwrap(), move_pos)); - - instructions -} - -fn unscramble_instruction_set() -> Vec<(Regex, fn(&mut VecDeque<char>, regex::Captures))> { - let mut instructions : Vec<(Regex, fn(&mut VecDeque<char>, regex::Captures))> = Vec::new(); - instructions.push((Regex::new(r"swap position (\d+) with position (\d+)").unwrap(), swap_pos)); - instructions.push((Regex::new(r"swap letter ([a-z]) with letter ([a-z])").unwrap(), swap_let)); - instructions.push((Regex::new(r"rotate left (\d+) step").unwrap(), rotate_right)); - instructions.push((Regex::new(r"rotate right (\d+) step").unwrap(), rotate_left)); - instructions.push((Regex::new(r"rotate based on position of letter ([a-z])").unwrap(), undo_rotate_pos)); - instructions.push((Regex::new(r"reverse positions (\d+) through (\d+)").unwrap(), reverse_sub)); - instructions.push((Regex::new(r"move position (\d+) to position (\d+)").unwrap(), undo_move_pos)); - - instructions -} - -fn swap_pos(pass: &mut VecDeque<char>, cap: regex::Captures) { - let src = cap.at(1).unwrap().parse::<usize>().unwrap(); - let dest = cap.at(2).unwrap().parse::<usize>().unwrap(); - pass.swap(src, dest); -} - -fn swap_let(pass: &mut VecDeque<char>, cap: regex::Captures) { - let src = cap.at(1).unwrap().chars().next().unwrap(); - let dest = cap.at(2).unwrap().chars().next().unwrap(); - let src_position = pass.iter().position(|&c| c == src); - let dest_position = pass.iter().position(|&c| c == dest); - match (src_position, dest_position) { - (Some(src_pos), Some(dest_pos)) => { - pass.swap(src_pos, dest_pos); - }, - _ => {} - }; -} - -fn rotate_left(pass: &mut VecDeque<char>, cap: regex::Captures) { - let steps = cap.at(1).unwrap().parse::<usize>().unwrap(); - for _ in 0..steps { - let c = pass.pop_front().unwrap(); - pass.push_back(c); - } -} - -fn rotate_right(pass: &mut VecDeque<char>, cap: regex::Captures) { - let steps = cap.at(1).unwrap().parse::<usize>().unwrap(); - for _ in 0..steps { - let c = pass.pop_back().unwrap(); - pass.push_front(c); - } -} - -fn rotate_pos(pass: &mut VecDeque<char>, cap: regex::Captures) { - let letter = cap.at(1).unwrap().chars().next().unwrap(); - let pos = pass.iter().position(|&c| c == letter).unwrap(); - let steps = 1 + pos + if pos >=4 { 1 } else { 0 }; - for _ in 0..steps { - let c = pass.pop_back().unwrap(); - pass.push_front(c); - } -} - -fn move_pos(pass: &mut VecDeque<char>, cap: regex::Captures) { - let src = cap.at(1).unwrap().parse::<usize>().unwrap(); - let dest = cap.at(2).unwrap().parse::<usize>().unwrap(); - let c = pass.remove(src).unwrap(); - pass.insert(dest, c); -} - -fn reverse_sub(pass: &mut VecDeque<char>, cap: regex::Captures) { - let mut start = cap.at(1).unwrap().parse::<usize>().unwrap(); - let mut end = cap.at(2).unwrap().parse::<usize>().unwrap(); - while start < end { - pass.swap(start, end); - start += 1; - end -= 1; - } -} - -fn undo_rotate_pos(pass: &mut VecDeque<char>, cap: regex::Captures) { - let letter = cap.at(1).unwrap().chars().next().unwrap(); - let dest_pos = pass.iter().position(|&c| c == letter).unwrap(); - let mut pos = dest_pos; - - loop { - let c = pass.pop_front().unwrap(); - pass.push_back(c); - pos -= 1; - let steps = 1 + pos + if pos >=4 { 1 } else { 0 }; - if (pos + steps) % pass.len() == dest_pos { - break; - } - } -} - -fn undo_move_pos(pass: &mut VecDeque<char>, cap: regex::Captures) { - let src = cap.at(1).unwrap().parse::<usize>().unwrap(); - let dest = cap.at(2).unwrap().parse::<usize>().unwrap(); - let c = pass.remove(dest).unwrap(); - pass.insert(src, c); -} - -#[test] -fn swap_pos_example() { - let instructions = vec!("swap position 4 with position 0".to_string()); - let password = "abcde".to_string(); - assert_eq!("ebcda".to_string(), scramble_password(password, instructions)); -} - -#[test] -fn swap_let_example() { - let instructions = vec!("swap letter d with letter b".to_string()); - let password = "ebcda".to_string(); - assert_eq!("edcba".to_string(), scramble_password(password, instructions)); -} - -#[test] -fn reverse_example() { - let instructions = vec!("reverse positions 0 through 4".to_string()); - let password = "edcba".to_string(); - assert_eq!("abcde".to_string(), scramble_password(password, instructions)); -} - -#[test] -fn rotate_left_example() { - let instructions = vec!("rotate left 1 step".to_string()); - let password = "abcde".to_string(); - assert_eq!("bcdea".to_string(), scramble_password(password, instructions)); -} - -#[test] -fn move_example() { - let instructions = vec!("move position 3 to position 0".to_string()); - let password = "bdeac".to_string(); - assert_eq!("abdec".to_string(), scramble_password(password, instructions)); -} - -#[test] -fn rotate_pos_example_1() { - let instructions = vec!("rotate based on position of letter b".to_string()); - let password = "abdec".to_string(); - assert_eq!("ecabd".to_string(), scramble_password(password, instructions)); -} - -#[test] -fn rotate_pos_example_2() { - let instructions = vec!("rotate based on position of letter d".to_string()); - let password = "ecabd".to_string(); - assert_eq!("decab".to_string(), scramble_password(password, instructions)); -} - -#[test] -fn rotate_right_example() { - let instructions = vec!("rotate right 2 steps".to_string()); - let password = "decab".to_string(); - assert_eq!("abdec".to_string(), scramble_password(password, instructions)); -} |