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-rw-r--r--2016/aoc23/src/main.rs247
1 files changed, 247 insertions, 0 deletions
diff --git a/2016/aoc23/src/main.rs b/2016/aoc23/src/main.rs
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+++ b/2016/aoc23/src/main.rs
@@ -0,0 +1,247 @@
+extern crate regex;
+use regex::Regex;
+
+use std::io::BufReader;
+use std::io::prelude::*;
+use std::fs::File;
+
+enum Instruction {
+ Inc(usize),
+ Dec(usize),
+
+ TglLit(i32),
+ TglReg(usize),
+
+ CpyLitReg(i32, usize),
+ CpyRegReg(usize, usize),
+ CpyLitLit(i32, i32),
+ CpyRegLit(usize, i32),
+
+ JnzLitLit(i32, i32),
+ JnzRegLit(usize, i32),
+ JnzLitReg(i32, usize),
+ JnzRegReg(usize, usize),
+
+ Noop
+}
+
+impl Instruction {
+ fn parse(line: &str) -> Instruction {
+ match Regex::new(r"inc (a|b|c|d)").unwrap().captures(line) {
+ Some(cap) => {
+ let reg = to_register_index(cap.at(1).unwrap());
+ return Instruction::Inc(reg);
+ },
+ _ => {}
+ }
+
+ match Regex::new(r"dec (a|b|c|d)").unwrap().captures(line) {
+ Some(cap) => {
+ let reg = to_register_index(cap.at(1).unwrap());
+ return Instruction::Dec(reg);
+ },
+ _ => {}
+ }
+
+
+ match Regex::new(r"tgl (a|b|c|d)").unwrap().captures(line) {
+ Some(cap) => {
+ let reg = to_register_index(cap.at(1).unwrap());
+ return Instruction::TglReg(reg);
+ },
+ _ => {}
+ }
+
+ match Regex::new(r"tgl ([-\d]+)").unwrap().captures(line) {
+ Some(cap) => {
+ let lit = cap.at(1).unwrap().parse().unwrap();
+ return Instruction::TglLit(lit);
+ },
+ _ => {}
+ }
+
+
+ match Regex::new(r"cpy ([-\d]+) (a|b|c|d)").unwrap().captures(line) {
+ Some(cap) => {
+ let src = cap.at(1).unwrap().parse().unwrap();
+ let dest = to_register_index(cap.at(2).unwrap());
+ return Instruction::CpyLitReg(src, dest);
+ },
+ _ => {}
+ }
+
+ match Regex::new(r"cpy (a|b|c|d) (a|b|c|d)").unwrap().captures(line) {
+ Some(cap) => {
+ let src = to_register_index(cap.at(1).unwrap());
+ let dest = to_register_index(cap.at(2).unwrap());
+ return Instruction::CpyRegReg(src, dest);
+ },
+ _ => {}
+ }
+
+ match Regex::new(r"cpy ([-\d]+) ([-\d]+)").unwrap().captures(line) {
+ Some(cap) => {
+ let src = cap.at(1).unwrap().parse().unwrap();
+ let dest = cap.at(2).unwrap().parse().unwrap();
+ return Instruction::CpyLitLit(src, dest);
+ },
+ _ => {}
+ }
+
+ match Regex::new(r"cpy (a|b|c|d) ([-\d]+)").unwrap().captures(line) {
+ Some(cap) => {
+ let src = to_register_index(cap.at(1).unwrap());
+ let dest = cap.at(2).unwrap().parse().unwrap();
+ return Instruction::CpyRegReg(src, dest);
+ },
+ _ => {}
+ }
+
+
+ match Regex::new(r"jnz ([-\d]+) (a|b|c|d)").unwrap().captures(line) {
+ Some(cap) => {
+ let src = cap.at(1).unwrap().parse().unwrap();
+ let dest = to_register_index(cap.at(2).unwrap());
+ return Instruction::JnzLitReg(src, dest);
+ },
+ _ => {}
+ }
+
+ match Regex::new(r"jnz (a|b|c|d) (a|b|c|d)").unwrap().captures(line) {
+ Some(cap) => {
+ let src = to_register_index(cap.at(1).unwrap());
+ let dest = to_register_index(cap.at(2).unwrap());
+ return Instruction::JnzRegReg(src, dest);
+ },
+ _ => {}
+ }
+
+ match Regex::new(r"jnz ([-\d]+) ([-\d]+)").unwrap().captures(line) {
+ Some(cap) => {
+ let src = cap.at(1).unwrap().parse().unwrap();
+ let dest = cap.at(2).unwrap().parse().unwrap();
+ return Instruction::JnzLitLit(src, dest);
+ },
+ _ => {}
+ }
+
+ match Regex::new(r"jnz (a|b|c|d) ([-\d]+)").unwrap().captures(line) {
+ Some(cap) => {
+ let src = to_register_index(cap.at(1).unwrap());
+ let dest = cap.at(2).unwrap().parse().unwrap();
+ return Instruction::JnzRegLit(src, dest);
+ },
+ _ => {}
+ }
+
+ panic!("Invalid instruction line");
+ }
+
+ fn toggle(&self) -> Self {
+ match *self {
+ Instruction::Inc(a) => Instruction::Dec(a),
+ Instruction::Dec(a) => Instruction::Inc(a),
+
+ Instruction::TglLit(_) => Instruction::Noop,
+ Instruction::TglReg(a) => Instruction::Inc(a),
+
+ Instruction::CpyLitReg(a, b) => Instruction::JnzLitReg(a, b),
+ Instruction::CpyRegReg(a, b) => Instruction::JnzRegReg(a, b),
+ Instruction::CpyLitLit(a, b) => Instruction::JnzLitLit(a, b),
+ Instruction::CpyRegLit(a, b) => Instruction::JnzRegLit(a, b),
+
+ Instruction::JnzLitLit(a, b) => Instruction::CpyLitLit(a, b),
+ Instruction::JnzRegLit(a, b) => Instruction::CpyRegLit(a, b),
+ Instruction::JnzLitReg(a, b) => Instruction::CpyLitReg(a, b),
+ Instruction::JnzRegReg(a, b) => Instruction::CpyRegReg(a, b),
+ Instruction::Noop => Instruction::Noop
+ }
+ }
+}
+
+fn main() {
+ let mut program = read_file();
+
+ let mut registers: [i32; 4] = [12, 0, 0, 0];
+ let mut pc: usize = 0;
+
+ while pc < program.len() {
+ let mut pc_next: usize = pc+1;
+
+ match program[pc] {
+ Instruction::Inc(dest) => {
+ registers[dest] += 1;
+ },
+ Instruction::Dec(dest) => {
+ registers[dest] -= 1;
+ },
+
+ Instruction::TglReg(offset) => {
+ let line_to_toggle = (pc as i32 + registers[offset]) as usize;
+ if line_to_toggle > 0 && line_to_toggle < program.len() {
+ program[line_to_toggle] = program[line_to_toggle].toggle();
+ }
+ },
+ Instruction::TglLit(offset) => {
+ let line_to_toggle = (pc as i32 + offset) as usize;
+ if line_to_toggle > 0 && line_to_toggle < program.len() {
+ program[line_to_toggle] = program[line_to_toggle].toggle();
+ }
+ },
+
+ Instruction::CpyLitReg(src, dest) => {
+ registers[dest] = src;
+ },
+ Instruction::CpyRegReg(src, dest) => {
+ registers[dest] = registers[src];
+ },
+ Instruction::CpyLitLit(_, _) | Instruction::CpyRegLit(_, _) => {},
+
+ Instruction::JnzRegLit(condition, offset) => {
+ if registers[condition] != 0 {
+ pc_next = (pc as i32 + offset) as usize;
+ }
+ },
+ Instruction::JnzLitLit(condition, offset) => {
+ if condition != 0 {
+ pc_next = (pc as i32 + offset) as usize;
+ }
+ },
+ Instruction::JnzRegReg(condition, offset) => {
+ if registers[condition] != 0 {
+ pc_next = (pc as i32 + registers[offset]) as usize;
+ }
+ },
+ Instruction::JnzLitReg(condition, offset) => {
+ if condition != 0 {
+ pc_next = (pc as i32 + registers[offset]) as usize;
+ }
+ },
+ Instruction::Noop => {}
+ }
+
+ pc = pc_next;
+ }
+
+ println!("a: {}, b: {}, c: {}, d: {}", registers[0], registers[1], registers[2], registers[3]);
+
+}
+
+fn to_register_index(name: &str) -> usize {
+ match name {
+ "a" => 0,
+ "b" => 1,
+ "c" => 2,
+ "d" => 3,
+ _ => panic!("Invalid register provided")
+ }
+}
+
+fn read_file() -> Vec<Instruction> {
+ let file = BufReader::new(File::open("input.txt").unwrap());
+ file.lines()
+ .map(|line| line.unwrap())
+ .filter(|line| line.len() > 0)
+ .map(|line| Instruction::parse(line.trim()))
+ .collect()
+}