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@@ -0,0 +1,461 @@
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+use std::collections::HashMap;
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+use std::convert::TryFrom;
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+use std::error::Error;
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+use std::fs::File;
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+use std::io::prelude::*;
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+use std::result;
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+use std::str::FromStr;
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+
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+use num_enum::TryFromPrimitive;
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+
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+type Result<T> = result::Result<T, Box<dyn Error>>;
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+
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+#[derive(Debug, Clone, PartialEq)]
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+pub struct Intcode {
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+ pub integers: HashMap<usize, i64>,
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+ pub pointer: usize,
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+ pub halted: bool,
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+ pub relative_base: i64,
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+}
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+
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+#[derive(Debug, PartialEq)]
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+pub struct Instruction {
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+ opcode: Opcode,
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+ parameter_modes: Vec<ParameterMode>,
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+}
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+
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+impl TryFrom<i64> for Instruction {
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+ type Error = Box<dyn Error>;
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+
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+ fn try_from(integer: i64) -> Result<Self> {
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+ let opcode: Opcode = Opcode::try_from((integer % 100) as u8)?;
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+ let modes_integer = integer / 100;
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+ let mut parameter_modes = vec![];
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+ for parameter_index in 0..opcode.parameter_count() {
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+ parameter_modes.push(ParameterMode::try_from(
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+ (modes_integer % (10_i64.pow(parameter_index + 1)) / 10_i64.pow(parameter_index))
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+ as u8,
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+ )?)
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+ }
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+ Ok(Instruction {
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+ opcode,
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+ parameter_modes,
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+ })
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+ }
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+}
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+
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+#[derive(Debug, PartialEq, TryFromPrimitive)]
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+#[repr(u8)]
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+pub enum Opcode {
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+ Add = 1,
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+ Mult = 2,
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+ Input = 3,
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+ Output = 4,
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+ JumpIfTrue = 5,
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+ JumpIfFalse = 6,
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+ LessThan = 7,
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+ Equals = 8,
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+ RelativeBaseOffset = 9,
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+ Halt = 99,
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+}
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+
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+impl Opcode {
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+ pub fn parameter_count(&self) -> u32 {
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+ match self {
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+ Opcode::Add => 3,
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+ Opcode::Mult => 3,
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+ Opcode::Input => 1,
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+ Opcode::Output => 1,
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+ Opcode::JumpIfTrue => 2,
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+ Opcode::JumpIfFalse => 2,
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+ Opcode::LessThan => 3,
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+ Opcode::Equals => 3,
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+ Opcode::RelativeBaseOffset => 1,
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+ Opcode::Halt => 0,
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+ }
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+ }
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+
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+ pub fn target_parameter_index(&self) -> Option<usize> {
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+ match self {
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+ Opcode::Add => Some(2),
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+ Opcode::Mult => Some(2),
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+ Opcode::Input => Some(0),
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+ Opcode::Output => None,
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+ Opcode::JumpIfTrue => None,
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+ Opcode::JumpIfFalse => None,
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+ Opcode::LessThan => Some(2),
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+ Opcode::Equals => Some(2),
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+ Opcode::RelativeBaseOffset => None,
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+ Opcode::Halt => None,
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+ }
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+ }
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+}
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+
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+#[derive(Debug, PartialEq, TryFromPrimitive)]
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+#[repr(u8)]
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+pub enum ParameterMode {
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+ Position = 0,
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+ Immediate = 1,
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+ Relative = 2,
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+}
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+
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+impl FromStr for Intcode {
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+ type Err = Box<dyn Error>;
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+
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+ fn from_str(s: &str) -> Result<Intcode> {
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+ let intcode_string = s.trim().to_string();
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+ let mut integers = HashMap::new();
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+ for (index, code) in intcode_string.split(',').enumerate() {
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+ integers.insert(index, code.parse().unwrap());
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+ }
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+
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+ Ok(Intcode::new(integers))
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+ }
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+}
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+
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+impl Intcode {
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+ fn new(integers: HashMap<usize, i64>) -> Intcode {
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+ Intcode {
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+ integers,
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+ pointer: 0,
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+ halted: false,
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+ relative_base: 0,
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+ }
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+ }
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+
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+ fn load_parameters(&mut self, pointer: usize, instruction: &Instruction) -> Vec<i64> {
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+ (0..instruction.opcode.parameter_count() as usize)
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+ .map(|parameter_index| {
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+ let mut integer = *self
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+ .integers
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+ .entry(pointer + parameter_index + 1)
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+ .or_insert(0);
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+ match instruction.parameter_modes[parameter_index] {
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+ ParameterMode::Position => match instruction.opcode.target_parameter_index() {
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+ Some(target_parameter_index)
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+ if target_parameter_index == parameter_index => {}
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+ _ => {
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+ integer = *self.integers.entry(integer as usize).or_insert(0);
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+ }
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+ },
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+ ParameterMode::Relative => match instruction.opcode.target_parameter_index() {
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+ Some(target_parameter_index)
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+ if target_parameter_index == parameter_index =>
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+ {
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+ integer += self.relative_base;
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+ }
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+ _ => {
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+ integer = *self
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+ .integers
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+ .entry((self.relative_base + integer) as usize)
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+ .or_insert(0);
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+ }
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+ },
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+ _ => {}
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+ }
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+ integer
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+ })
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+ .collect()
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+ }
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+
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+ pub fn execute(&mut self, inputs: &[i64]) -> Result<Vec<i64>> {
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+ let mut input_index = 0;
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+ let mut output = vec![];
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+
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+ loop {
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+ let instruction =
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+ Instruction::try_from(*self.integers.entry(self.pointer).or_insert(0))?;
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+ let parameters = self.load_parameters(self.pointer, &instruction);
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+ let mut jump_pointer: Option<usize> = None;
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+
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+ match instruction.opcode {
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+ Opcode::Add => {
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+ self.integers
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+ .insert(parameters[2] as usize, parameters[0] + parameters[1]);
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+ }
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+ Opcode::Mult => {
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+ self.integers
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+ .insert(parameters[2] as usize, parameters[0] * parameters[1]);
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+ }
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+ Opcode::Input => {
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+ if input_index >= inputs.len() {
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+ break; // pause execution to wait for more input
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+ }
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+ self.integers
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+ .insert(parameters[0] as usize, inputs[input_index]);
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+ input_index += 1;
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+ }
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+ Opcode::Output => {
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+ output.push(parameters[0]);
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+ }
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+ Opcode::JumpIfTrue => {
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+ if parameters[0] != 0 {
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+ jump_pointer = Some(parameters[1] as usize);
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+ }
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+ }
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+ Opcode::JumpIfFalse => {
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+ if parameters[0] == 0 {
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+ jump_pointer = Some(parameters[1] as usize);
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+ }
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+ }
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+ Opcode::LessThan => {
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+ if parameters[0] < parameters[1] {
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+ self.integers.insert(parameters[2] as usize, 1);
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+ } else {
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+ self.integers.insert(parameters[2] as usize, 0);
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+ }
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+ }
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+ Opcode::Equals => {
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+ if parameters[0] == parameters[1] {
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+ self.integers.insert(parameters[2] as usize, 1);
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+ } else {
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+ self.integers.insert(parameters[2] as usize, 0);
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+ }
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+ }
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+ Opcode::RelativeBaseOffset => {
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+ self.relative_base += parameters[0];
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+ }
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+ Opcode::Halt => {
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+ self.halted = true;
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+ break;
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+ }
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+ }
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+
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+ match jump_pointer {
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+ Some(jump_pointer) => self.pointer = jump_pointer,
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+ None => self.pointer += 1 + instruction.opcode.parameter_count() as usize,
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+ }
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+ }
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+
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+ Ok(output)
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+ }
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+}
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+
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+pub fn read_intcode(filename: &str) -> Result<Intcode> {
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+ let mut file = File::open(filename)?;
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+ let mut intcode_string = String::new();
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+ file.read_to_string(&mut intcode_string)?;
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+
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+ Ok(intcode_string.parse()?)
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+}
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+
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+#[cfg(test)]
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+mod tests {
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+ use super::*;
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+
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+ const TEST_INPUT: &str = "input/test1.txt";
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+
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+ #[test]
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+ fn reads_intcode() {
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+ assert_eq!(
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+ read_intcode(TEST_INPUT).unwrap(),
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+ Intcode::new(
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+ vec![3, 15, 3, 16, 1002, 16, 10, 16, 1, 16, 15, 15, 4, 15, 99, 0, 0]
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+ .into_iter()
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+ .enumerate()
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+ .collect()
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+ ),
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+ );
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+ }
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+
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+ #[test]
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+ fn converts_integer_to_instruction() {
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+ assert_eq!(
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+ Instruction::try_from(1002).unwrap(),
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+ Instruction {
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+ opcode: Opcode::Mult,
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+ parameter_modes: vec![
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+ ParameterMode::Position,
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+ ParameterMode::Immediate,
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+ ParameterMode::Position
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+ ],
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+ }
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+ );
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+
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+ assert_eq!(
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+ Instruction::try_from(101).unwrap(),
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+ Instruction {
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+ opcode: Opcode::Add,
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+ parameter_modes: vec![
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+ ParameterMode::Immediate,
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+ ParameterMode::Position,
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+ ParameterMode::Position
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+ ],
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+ }
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+ );
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+ }
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+
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+ #[test]
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+ fn executes_intcodes() {
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+ let mut intcode = Intcode::new(vec![1, 0, 0, 0, 99].into_iter().enumerate().collect());
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+ intcode.execute(&[0]).unwrap();
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+ assert_eq!(
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+ intcode.integers,
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+ vec![2, 0, 0, 0, 99].into_iter().enumerate().collect()
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+ );
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+
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+ let mut intcode = Intcode::new(vec![2, 3, 0, 3, 99].into_iter().enumerate().collect());
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+ intcode.execute(&[0]).unwrap();
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+ assert_eq!(
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+ intcode.integers,
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+ vec![2, 3, 0, 6, 99].into_iter().enumerate().collect()
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+ );
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+
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+ let mut intcode = Intcode::new(vec![2, 4, 4, 5, 99, 0].into_iter().enumerate().collect());
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+ intcode.execute(&[0]).unwrap();
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+ assert_eq!(
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+ intcode.integers,
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+ vec![2, 4, 4, 5, 99, 9801].into_iter().enumerate().collect()
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+ );
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+
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+ let mut intcode = Intcode::new(
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+ vec![1, 1, 1, 4, 99, 5, 6, 0, 99]
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+ .into_iter()
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+ .enumerate()
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+ .collect(),
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+ );
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+ intcode.execute(&[0]).unwrap();
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+ assert_eq!(
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+ intcode.integers,
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+ vec![30, 1, 1, 4, 2, 5, 6, 0, 99]
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321
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+ .into_iter()
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+ .enumerate()
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+ .collect()
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+ );
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+
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+ let mut intcode = Intcode::new(
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327
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+ vec![1, 9, 10, 3, 2, 3, 11, 0, 99, 30, 40, 50]
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328
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+ .into_iter()
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329
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+ .enumerate()
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+ .collect(),
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+ );
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|
332
|
+ intcode.execute(&[0]).unwrap();
|
|
|
333
|
+ assert_eq!(
|
|
|
334
|
+ intcode.integers,
|
|
|
335
|
+ vec![3500, 9, 10, 70, 2, 3, 11, 0, 99, 30, 40, 50]
|
|
|
336
|
+ .into_iter()
|
|
|
337
|
+ .enumerate()
|
|
|
338
|
+ .collect()
|
|
|
339
|
+ );
|
|
|
340
|
+ }
|
|
|
341
|
+
|
|
|
342
|
+ #[test]
|
|
|
343
|
+ fn less_and_equal_outputs() {
|
|
|
344
|
+ let intcode = Intcode::new(
|
|
|
345
|
+ vec![3, 9, 8, 9, 10, 9, 4, 9, 99, -1, 8]
|
|
|
346
|
+ .into_iter()
|
|
|
347
|
+ .enumerate()
|
|
|
348
|
+ .collect(),
|
|
|
349
|
+ );
|
|
|
350
|
+ assert_eq!(intcode.clone().execute(&[8]).unwrap(), vec![1]);
|
|
|
351
|
+ assert_eq!(intcode.clone().execute(&[0]).unwrap(), vec![0]);
|
|
|
352
|
+
|
|
|
353
|
+ let intcode = Intcode::new(
|
|
|
354
|
+ vec![3, 9, 7, 9, 10, 9, 4, 9, 99, -1, 8]
|
|
|
355
|
+ .into_iter()
|
|
|
356
|
+ .enumerate()
|
|
|
357
|
+ .collect(),
|
|
|
358
|
+ );
|
|
|
359
|
+ assert_eq!(intcode.clone().execute(&[0]).unwrap(), vec![1]);
|
|
|
360
|
+ assert_eq!(intcode.clone().execute(&[9]).unwrap(), vec![0]);
|
|
|
361
|
+
|
|
|
362
|
+ let intcode = Intcode::new(
|
|
|
363
|
+ vec![3, 3, 1108, -1, 8, 3, 4, 3, 99]
|
|
|
364
|
+ .into_iter()
|
|
|
365
|
+ .enumerate()
|
|
|
366
|
+ .collect(),
|
|
|
367
|
+ );
|
|
|
368
|
+ assert_eq!(intcode.clone().execute(&[8]).unwrap(), vec![1]);
|
|
|
369
|
+ assert_eq!(intcode.clone().execute(&[0]).unwrap(), vec![0]);
|
|
|
370
|
+
|
|
|
371
|
+ let intcode = Intcode::new(
|
|
|
372
|
+ vec![3, 3, 1107, -1, 8, 3, 4, 3, 99]
|
|
|
373
|
+ .into_iter()
|
|
|
374
|
+ .enumerate()
|
|
|
375
|
+ .collect(),
|
|
|
376
|
+ );
|
|
|
377
|
+ assert_eq!(intcode.clone().execute(&[0]).unwrap(), vec![1]);
|
|
|
378
|
+ assert_eq!(intcode.clone().execute(&[9]).unwrap(), vec![0]);
|
|
|
379
|
+ }
|
|
|
380
|
+
|
|
|
381
|
+ #[test]
|
|
|
382
|
+ fn jump_outputs() {
|
|
|
383
|
+ let intcode = Intcode::new(
|
|
|
384
|
+ vec![3, 12, 6, 12, 15, 1, 13, 14, 13, 4, 13, 99, -1, 0, 1, 9]
|
|
|
385
|
+ .into_iter()
|
|
|
386
|
+ .enumerate()
|
|
|
387
|
+ .collect(),
|
|
|
388
|
+ );
|
|
|
389
|
+ assert_eq!(intcode.clone().execute(&[0]).unwrap(), vec![0]);
|
|
|
390
|
+ assert_eq!(intcode.clone().execute(&[1]).unwrap(), vec![1]);
|
|
|
391
|
+
|
|
|
392
|
+ let intcode = Intcode::new(
|
|
|
393
|
+ vec![3, 3, 1105, -1, 9, 1101, 0, 0, 12, 4, 12, 99, 1]
|
|
|
394
|
+ .into_iter()
|
|
|
395
|
+ .enumerate()
|
|
|
396
|
+ .collect(),
|
|
|
397
|
+ );
|
|
|
398
|
+ assert_eq!(intcode.clone().execute(&[0]).unwrap(), vec![0]);
|
|
|
399
|
+ assert_eq!(intcode.clone().execute(&[1]).unwrap(), vec![1]);
|
|
|
400
|
+ }
|
|
|
401
|
+
|
|
|
402
|
+ #[test]
|
|
|
403
|
+ fn larger_part2_intcode() {
|
|
|
404
|
+ let intcode = Intcode::new(
|
|
|
405
|
+ vec![
|
|
|
406
|
+ 3, 21, 1008, 21, 8, 20, 1005, 20, 22, 107, 8, 21, 20, 1006, 20, 31, 1106, 0, 36,
|
|
|
407
|
+ 98, 0, 0, 1002, 21, 125, 20, 4, 20, 1105, 1, 46, 104, 999, 1105, 1, 46, 1101, 1000,
|
|
|
408
|
+ 1, 20, 4, 20, 1105, 1, 46, 98, 99,
|
|
|
409
|
+ ]
|
|
|
410
|
+ .into_iter()
|
|
|
411
|
+ .enumerate()
|
|
|
412
|
+ .collect(),
|
|
|
413
|
+ );
|
|
|
414
|
+ assert_eq!(intcode.clone().execute(&[0]).unwrap(), vec![999]);
|
|
|
415
|
+ assert_eq!(intcode.clone().execute(&[8]).unwrap(), vec![1000]);
|
|
|
416
|
+ assert_eq!(intcode.clone().execute(&[9]).unwrap(), vec![1001]);
|
|
|
417
|
+ }
|
|
|
418
|
+
|
|
|
419
|
+ #[test]
|
|
|
420
|
+ fn multiple_input_intcode() {
|
|
|
421
|
+ let intcode = Intcode::new(
|
|
|
422
|
+ vec![
|
|
|
423
|
+ 3, 15, 3, 16, 1002, 16, 10, 16, 1, 16, 15, 15, 4, 15, 99, 0, 0,
|
|
|
424
|
+ ]
|
|
|
425
|
+ .into_iter()
|
|
|
426
|
+ .enumerate()
|
|
|
427
|
+ .collect(),
|
|
|
428
|
+ );
|
|
|
429
|
+ assert_eq!(intcode.clone().execute(&[1, 1]).unwrap(), vec![11]);
|
|
|
430
|
+ }
|
|
|
431
|
+
|
|
|
432
|
+ #[test]
|
|
|
433
|
+ fn relative_base_offset_quine() {
|
|
|
434
|
+ let code = vec![
|
|
|
435
|
+ 109, 1, 204, -1, 1001, 100, 1, 100, 1008, 100, 16, 101, 1006, 101, 0, 99,
|
|
|
436
|
+ ];
|
|
|
437
|
+ let intcode = Intcode::new(code.clone().into_iter().enumerate().collect());
|
|
|
438
|
+ assert_eq!(intcode.clone().execute(&[]).unwrap(), code);
|
|
|
439
|
+ }
|
|
|
440
|
+
|
|
|
441
|
+ #[test]
|
|
|
442
|
+ fn sixteen_digit_output() {
|
|
|
443
|
+ let code = vec![1102, 34915192, 34915192, 7, 4, 7, 99, 0];
|
|
|
444
|
+ let intcode = Intcode::new(code.into_iter().enumerate().collect());
|
|
|
445
|
+ assert_eq!(intcode.clone().execute(&[]).unwrap(), [1219070632396864]);
|
|
|
446
|
+ }
|
|
|
447
|
+
|
|
|
448
|
+ #[test]
|
|
|
449
|
+ fn large_output() {
|
|
|
450
|
+ let code = vec![104, 1125899906842624, 99];
|
|
|
451
|
+ let intcode = Intcode::new(code.into_iter().enumerate().collect());
|
|
|
452
|
+ assert_eq!(intcode.clone().execute(&[]).unwrap(), [1125899906842624]);
|
|
|
453
|
+ }
|
|
|
454
|
+
|
|
|
455
|
+ #[test]
|
|
|
456
|
+ fn relative_target_parameters() {
|
|
|
457
|
+ let code = vec![109, 1, 203, 2, 204, 2, 99];
|
|
|
458
|
+ let intcode = Intcode::new(code.into_iter().enumerate().collect());
|
|
|
459
|
+ assert_eq!(intcode.clone().execute(&[123]).unwrap(), [123]);
|
|
|
460
|
+ }
|
|
|
461
|
+}
|
