Refile for merging repos

1 files changed, 0 insertions, 233 deletions

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));
-}