From 9607567aa9bba8e2e83f3f3a38c4eb0f0ecb2017 Mon Sep 17 00:00:00 2001 From: Justin Worthe Date: Thu, 22 Dec 2016 15:51:25 +0200 Subject: AOC21 --- aoc21/Cargo.lock | 98 +++++++++++++++++++++++ aoc21/Cargo.toml | 7 ++ aoc21/input.txt | 100 +++++++++++++++++++++++ aoc21/src/main.rs | 233 ++++++++++++++++++++++++++++++++++++++++++++++++++++++ 4 files changed, 438 insertions(+) create mode 100644 aoc21/Cargo.lock create mode 100644 aoc21/Cargo.toml create mode 100644 aoc21/input.txt create mode 100644 aoc21/src/main.rs (limited to 'aoc21') diff --git a/aoc21/Cargo.lock b/aoc21/Cargo.lock new file mode 100644 index 0000000..9a1075b --- /dev/null +++ b/aoc21/Cargo.lock @@ -0,0 +1,98 @@ +[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 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index 0000000..bc0d468 --- /dev/null +++ b/aoc21/Cargo.toml @@ -0,0 +1,7 @@ +[package] +name = "aoc21" +version = "0.1.0" +authors = ["Justin Worthe "] + +[dependencies] +regex = "0.1" \ No newline at end of file diff --git a/aoc21/input.txt b/aoc21/input.txt new file mode 100644 index 0000000..ebd7d52 --- /dev/null +++ b/aoc21/input.txt @@ -0,0 +1,100 @@ +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 new file mode 100644 index 0000000..1366f1e --- /dev/null +++ b/aoc21/src/main.rs @@ -0,0 +1,233 @@ +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 { + 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 { + let mut pass = password.chars().collect::>(); + + 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 { + let mut pass = password.chars().collect::>(); + + 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, regex::Captures))> { + let mut instructions : Vec<(Regex, fn(&mut VecDeque, 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, regex::Captures))> { + let mut instructions : Vec<(Regex, fn(&mut VecDeque, 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, cap: regex::Captures) { + let src = cap.at(1).unwrap().parse::().unwrap(); + let dest = cap.at(2).unwrap().parse::().unwrap(); + pass.swap(src, dest); +} + +fn swap_let(pass: &mut VecDeque, 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, cap: regex::Captures) { + let steps = cap.at(1).unwrap().parse::().unwrap(); + for _ in 0..steps { + let c = pass.pop_front().unwrap(); + pass.push_back(c); + } +} + +fn rotate_right(pass: &mut VecDeque, cap: regex::Captures) { + let steps = cap.at(1).unwrap().parse::().unwrap(); + for _ in 0..steps { + let c = pass.pop_back().unwrap(); + pass.push_front(c); + } +} + +fn rotate_pos(pass: &mut VecDeque, 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, cap: regex::Captures) { + let src = cap.at(1).unwrap().parse::().unwrap(); + let dest = cap.at(2).unwrap().parse::().unwrap(); + let c = pass.remove(src).unwrap(); + pass.insert(dest, c); +} + +fn reverse_sub(pass: &mut VecDeque, cap: regex::Captures) { + let mut start = cap.at(1).unwrap().parse::().unwrap(); + let mut end = cap.at(2).unwrap().parse::().unwrap(); + while start < end { + pass.swap(start, end); + start += 1; + end -= 1; + } +} + +fn undo_rotate_pos(pass: &mut VecDeque, 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, cap: regex::Captures) { + let src = cap.at(1).unwrap().parse::().unwrap(); + let dest = cap.at(2).unwrap().parse::().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)); +} -- cgit v1.2.3