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+98
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[metadata]
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@@ -0,0 +1,7 @@
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[package]
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name = "day12"
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version = "0.1.0"
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authors = ["~krowbar"]
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[dependencies]
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regex = "0.1"
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@@ -0,0 +1,114 @@
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extern crate regex;
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use regex::Regex;
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use std::io::Read;
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use std::fs::File;
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// registers a, b, c, d indexed at 0
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// cpy x y copies x (either an integer or the value of a register) into register y.
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// inc x increases the value of register x by one.
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// dec x decreases the value of register x by one.
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// jnz x y jumps to an instruction y away (positive means forward; negative means backward), but only if x is not zero.
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#[derive(Debug)]
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enum Operator {
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CpyR { from: u8, dest: u8 }, //from register
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CpyV { value: i64, dest: u8}, //from value
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Inc { reg: u8},
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Dec { reg: u8},
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JnzR { reg: u8, dist: i32}, //from register
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JnzV { flag: i64, dist: i32}, //from value
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}
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fn reg_to_idx(name: &str) -> u8 {
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match name {
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"a" => 0,
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"b" => 1,
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"c" => 2,
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"d" => 3,
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_ => 0,
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}
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}
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fn main() {
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let mut ops: Vec<Operator> = Vec::new();
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//**** Read in the file input and convert it to a Vec of Operations ****//
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let mut file = File::open("./data").expect("could not open file");
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let mut input = String::new();
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file.read_to_string(&mut input).expect("could not read file");
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let re_cpy = Regex::new(r"^cpy (.*) (.*)$").unwrap();
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let re_inc = Regex::new(r"^inc (.*)$").unwrap();
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let re_dec = Regex::new(r"^dec (.*)$").unwrap();
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let re_jnz = Regex::new(r"^jnz (.*) (.*)$").unwrap();
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for line in input.lines() {
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if re_cpy.is_match(line) {
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let cap = re_cpy.captures(line).unwrap();
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let reg2 = reg_to_idx(cap.at(2).unwrap());
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match cap.at(1).unwrap().parse::<i64>() {
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Ok(v) => ops.push(Operator::CpyV { value: v, dest: reg2 }),
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Err(e) => ops.push(Operator::CpyR { from: reg_to_idx(cap.at(1).unwrap()), dest: reg2 }),
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};
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}
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else if re_inc.is_match(line) {
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let cap = re_inc.captures(line).unwrap();
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let value = cap.at(1).unwrap();
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ops.push(Operator::Inc { reg: reg_to_idx(value) });
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}
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else if re_dec.is_match(line) {
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let cap = re_dec.captures(line).unwrap();
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let value = cap.at(1).unwrap();
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ops.push(Operator::Dec { reg: reg_to_idx(value) });
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}
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else if re_jnz.is_match(line) {
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let cap = re_jnz.captures(line).unwrap();
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let val2 = cap.at(2).unwrap().parse::<i32>().unwrap();
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match cap.at(1).unwrap().parse::<i64>() {
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Ok(v) => ops.push(Operator::JnzV { flag: v, dist: val2 }),
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Err(e) => ops.push(Operator::JnzR { reg: reg_to_idx(cap.at(1).unwrap()), dist: val2 }),
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};
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}
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}
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//println!("{:?}", ops);
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println!("Converted input values");
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//**** loop through the Operations vector ****//
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//part1 started registers with all 0s, part 2 sets 'c' to 1
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let mut registers: Vec<i64> = vec![0, 0, 1, 0]; //registers 'a', 'b', 'c', and 'd'
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let mut idx = 0;
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println!("Processing {} operations", ops.len());
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'ops_loop: while idx < ops.len() {
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//print!("Run[{}] {:?}", idx, ops[idx]);
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match ops[idx] {
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Operator::CpyR{ from, dest } => {
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registers[dest as usize] = registers[from as usize];
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},
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Operator::CpyV{ value, dest } => {
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registers[dest as usize] = value;
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},
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Operator::Inc{ reg } => {
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registers[reg as usize] = registers[reg as usize] + 1;
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},
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Operator::Dec{ reg } => {
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registers[reg as usize] = registers[reg as usize] - 1;
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},
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Operator::JnzR{ reg, dist } => {
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if registers[reg as usize] != 0 {
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idx = (idx as i32 + dist) as usize;
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continue 'ops_loop;
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}
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},
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Operator::JnzV{ flag, dist } => {
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if flag != 0 {
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idx = (idx as i32 + dist) as usize;
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continue 'ops_loop;
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}
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},
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};
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//println!(" -> {:?}", registers);
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idx = idx + 1;
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}
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println!("Registers {:?}", registers);
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}
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