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diff --git a/day9/input/test1.txt b/day9/input/test1.txt new file mode 100644 index 0000000..e626457 --- /dev/null +++ b/day9/input/test1.txt @@ -0,0 +1 @@ +3,15,3,16,1002,16,10,16,1,16,15,15,4,15,99,0,0 diff --git a/day9/src/intcode.rs b/day9/src/intcode.rs new file mode 100644 index 0000000..f755deb --- /dev/null +++ b/day9/src/intcode.rs @@ -0,0 +1,407 @@ +use std::collections::HashMap; +use std::convert::TryFrom; +use std::error::Error; +use std::fs::File; +use std::io::prelude::*; +use std::result; +use std::str::FromStr; + +use num_enum::TryFromPrimitive; + +type Result = result::Result>; + +#[derive(Debug, Clone, PartialEq)] +pub struct Intcode { + pub integers: HashMap, + pub pointer: usize, + pub halted: bool, +} + +#[derive(Debug, PartialEq)] +pub struct Instruction { + opcode: Opcode, + parameter_modes: Vec, +} + +impl TryFrom for Instruction { + type Error = Box; + + fn try_from(integer: i32) -> Result { + let opcode: Opcode = Opcode::try_from((integer % 100) as u8)?; + let modes_integer = integer / 100; + let mut parameter_modes = vec![]; + for parameter_index in 0..opcode.parameter_count() { + parameter_modes.push(match opcode.target_parameter_index() { + Some(target_parameter_index) + if target_parameter_index == parameter_index as usize => + { + ParameterMode::Position + } + _ => ParameterMode::try_from( + (modes_integer % (10_i32.pow(parameter_index + 1)) + / 10_i32.pow(parameter_index)) as u8, + )?, + }) + } + Ok(Instruction { + opcode, + parameter_modes, + }) + } +} + +#[derive(Debug, PartialEq, TryFromPrimitive)] +#[repr(u8)] +pub enum Opcode { + Add = 1, + Mult = 2, + Input = 3, + Output = 4, + JumpIfTrue = 5, + JumpIfFalse = 6, + LessThan = 7, + Equals = 8, + Halt = 99, +} + +impl Opcode { + pub fn parameter_count(&self) -> u32 { + match self { + Opcode::Add => 3, + Opcode::Mult => 3, + Opcode::Input => 1, + Opcode::Output => 1, + Opcode::JumpIfTrue => 2, + Opcode::JumpIfFalse => 2, + Opcode::LessThan => 3, + Opcode::Equals => 3, + Opcode::Halt => 0, + } + } + + pub fn target_parameter_index(&self) -> Option { + match self { + Opcode::Add => Some(2), + Opcode::Mult => Some(2), + Opcode::Input => Some(0), + Opcode::Output => None, + Opcode::JumpIfTrue => None, + Opcode::JumpIfFalse => None, + Opcode::LessThan => Some(2), + Opcode::Equals => Some(2), + Opcode::Halt => None, + } + } +} + +#[derive(Debug, PartialEq, TryFromPrimitive)] +#[repr(u8)] +pub enum ParameterMode { + Position = 0, + Immediate = 1, +} + +impl FromStr for Intcode { + type Err = Box; + + fn from_str(s: &str) -> Result { + let intcode_string = s.trim().to_string(); + let mut integers = HashMap::new(); + for (index, code) in intcode_string.split(',').enumerate() { + integers.insert(index, code.parse().unwrap()); + } + + Ok(Intcode::new(integers)) + } +} + +impl Intcode { + fn new(integers: HashMap) -> Intcode { + Intcode { + integers, + pointer: 0, + halted: false, + } + } + fn load_parameters(&self, pointer: usize, instruction: &Instruction) -> Vec { + (0..instruction.opcode.parameter_count() as usize) + .map(|parameter_index| { + let mut integer = self.integers[&(pointer + parameter_index + 1)]; + if let ParameterMode::Position = instruction.parameter_modes[parameter_index] { + match instruction.opcode.target_parameter_index() { + Some(target_parameter_index) + if target_parameter_index == parameter_index => {} + _ => { + integer = self.integers[&(integer as usize)]; + } + } + } + integer + }) + .collect() + } + + pub fn execute(&mut self, inputs: &[i32]) -> Result> { + let mut input_index = 0; + let mut output = vec![]; + + loop { + let instruction = Instruction::try_from(self.integers[&self.pointer])?; + let parameters = self.load_parameters(self.pointer, &instruction); + let mut jump_pointer: Option = None; + + match instruction.opcode { + Opcode::Add => { + self.integers.insert(parameters[2] as usize, parameters[0] + parameters[1]); + } + Opcode::Mult => { + self.integers.insert(parameters[2] as usize, parameters[0] * parameters[1]); + } + Opcode::Input => { + if input_index >= inputs.len() { + break; // pause execution to wait for more input + } + self.integers.insert(parameters[0] as usize, inputs[input_index]); + input_index += 1; + } + Opcode::Output => { + output.push(parameters[0]); + } + Opcode::JumpIfTrue => { + if parameters[0] != 0 { + jump_pointer = Some(parameters[1] as usize); + } + } + Opcode::JumpIfFalse => { + if parameters[0] == 0 { + jump_pointer = Some(parameters[1] as usize); + } + } + Opcode::LessThan => { + if parameters[0] < parameters[1] { + self.integers.insert(parameters[2] as usize, 1); + } else { + self.integers.insert(parameters[2] as usize, 0); + } + } + Opcode::Equals => { + if parameters[0] == parameters[1] { + self.integers.insert(parameters[2] as usize, 1); + } else { + self.integers.insert(parameters[2] as usize, 0); + } + } + Opcode::Halt => { + self.halted = true; + break; + } + } + + match jump_pointer { + Some(jump_pointer) => self.pointer = jump_pointer, + None => self.pointer += 1 + instruction.opcode.parameter_count() as usize, + } + } + + Ok(output) + } +} + +pub fn read_intcode(filename: &str) -> Result { + let mut file = File::open(filename)?; + let mut intcode_string = String::new(); + file.read_to_string(&mut intcode_string)?; + + Ok(intcode_string.parse()?) +} + +#[cfg(test)] +mod tests { + use super::*; + + const TEST_INPUT: &str = "input/test1.txt"; + + #[test] + fn reads_intcode() { + assert_eq!( + read_intcode(TEST_INPUT).unwrap(), + Intcode::new( + vec![3, 15, 3, 16, 1002, 16, 10, 16, 1, 16, 15, 15, 4, 15, 99, 0, 0] + .into_iter() + .enumerate() + .collect() + ), + ); + } + + #[test] + fn converts_integer_to_instruction() { + assert_eq!( + Instruction::try_from(1002).unwrap(), + Instruction { + opcode: Opcode::Mult, + parameter_modes: vec![ + ParameterMode::Position, + ParameterMode::Immediate, + ParameterMode::Position + ], + } + ); + + assert_eq!( + Instruction::try_from(101).unwrap(), + Instruction { + opcode: Opcode::Add, + parameter_modes: vec![ + ParameterMode::Immediate, + ParameterMode::Position, + ParameterMode::Position + ], + } + ); + } + + #[test] + fn executes_intcodes() { + let mut intcode = Intcode::new(vec![1, 0, 0, 0, 99].into_iter().enumerate().collect()); + intcode.execute(&[0]).unwrap(); + assert_eq!( + intcode.integers, + vec![2, 0, 0, 0, 99].into_iter().enumerate().collect() + ); + + let mut intcode = Intcode::new(vec![2, 3, 0, 3, 99].into_iter().enumerate().collect()); + intcode.execute(&[0]).unwrap(); + assert_eq!( + intcode.integers, + vec![2, 3, 0, 6, 99].into_iter().enumerate().collect() + ); + + let mut intcode = Intcode::new(vec![2, 4, 4, 5, 99, 0].into_iter().enumerate().collect()); + intcode.execute(&[0]).unwrap(); + assert_eq!( + intcode.integers, + vec![2, 4, 4, 5, 99, 9801].into_iter().enumerate().collect() + ); + + let mut intcode = Intcode::new( + vec![1, 1, 1, 4, 99, 5, 6, 0, 99] + .into_iter() + .enumerate() + .collect(), + ); + intcode.execute(&[0]).unwrap(); + assert_eq!( + intcode.integers, + vec![30, 1, 1, 4, 2, 5, 6, 0, 99] + .into_iter() + .enumerate() + .collect() + ); + + let mut intcode = Intcode::new( + vec![1, 9, 10, 3, 2, 3, 11, 0, 99, 30, 40, 50] + .into_iter() + .enumerate() + .collect(), + ); + intcode.execute(&[0]).unwrap(); + assert_eq!( + intcode.integers, + vec![3500, 9, 10, 70, 2, 3, 11, 0, 99, 30, 40, 50] + .into_iter() + .enumerate() + .collect() + ); + } + + #[test] + fn less_and_equal_outputs() { + let intcode = Intcode::new( + vec![3, 9, 8, 9, 10, 9, 4, 9, 99, -1, 8] + .into_iter() + .enumerate() + .collect(), + ); + assert_eq!(intcode.clone().execute(&[8]).unwrap(), vec![1]); + assert_eq!(intcode.clone().execute(&[0]).unwrap(), vec![0]); + + let intcode = Intcode::new( + vec![3, 9, 7, 9, 10, 9, 4, 9, 99, -1, 8] + .into_iter() + .enumerate() + .collect(), + ); + assert_eq!(intcode.clone().execute(&[0]).unwrap(), vec![1]); + assert_eq!(intcode.clone().execute(&[9]).unwrap(), vec![0]); + + let intcode = Intcode::new( + vec![3, 3, 1108, -1, 8, 3, 4, 3, 99] + .into_iter() + .enumerate() + .collect(), + ); + assert_eq!(intcode.clone().execute(&[8]).unwrap(), vec![1]); + assert_eq!(intcode.clone().execute(&[0]).unwrap(), vec![0]); + + let intcode = Intcode::new( + vec![3, 3, 1107, -1, 8, 3, 4, 3, 99] + .into_iter() + .enumerate() + .collect(), + ); + assert_eq!(intcode.clone().execute(&[0]).unwrap(), vec![1]); + assert_eq!(intcode.clone().execute(&[9]).unwrap(), vec![0]); + } + + #[test] + fn jump_outputs() { + let intcode = Intcode::new( + vec![3, 12, 6, 12, 15, 1, 13, 14, 13, 4, 13, 99, -1, 0, 1, 9] + .into_iter() + .enumerate() + .collect(), + ); + assert_eq!(intcode.clone().execute(&[0]).unwrap(), vec![0]); + assert_eq!(intcode.clone().execute(&[1]).unwrap(), vec![1]); + + let intcode = Intcode::new( + vec![3, 3, 1105, -1, 9, 1101, 0, 0, 12, 4, 12, 99, 1] + .into_iter() + .enumerate() + .collect(), + ); + assert_eq!(intcode.clone().execute(&[0]).unwrap(), vec![0]); + assert_eq!(intcode.clone().execute(&[1]).unwrap(), vec![1]); + } + + #[test] + fn larger_part2_intcode() { + let intcode = Intcode::new( + vec![ + 3, 21, 1008, 21, 8, 20, 1005, 20, 22, 107, 8, 21, 20, 1006, 20, 31, 1106, 0, 36, + 98, 0, 0, 1002, 21, 125, 20, 4, 20, 1105, 1, 46, 104, 999, 1105, 1, 46, 1101, 1000, + 1, 20, 4, 20, 1105, 1, 46, 98, 99, + ] + .into_iter() + .enumerate() + .collect(), + ); + assert_eq!(intcode.clone().execute(&[0]).unwrap(), vec![999]); + assert_eq!(intcode.clone().execute(&[8]).unwrap(), vec![1000]); + assert_eq!(intcode.clone().execute(&[9]).unwrap(), vec![1001]); + } + + #[test] + fn multiple_input_intcode() { + let intcode = Intcode::new( + vec![ + 3, 15, 3, 16, 1002, 16, 10, 16, 1, 16, 15, 15, 4, 15, 99, 0, 0, + ] + .into_iter() + .enumerate() + .collect(), + ); + assert_eq!(intcode.clone().execute(&[1, 1]).unwrap(), vec![11]); + } +} diff --git a/day9/src/main.rs b/day9/src/main.rs new file mode 100644 index 0000000..2a3a2c7 --- /dev/null +++ b/day9/src/main.rs @@ -0,0 +1,30 @@ +use std::error::Error; +use std::result; + +mod intcode; + +use intcode::{Intcode, read_intcode}; + +const INPUT: &str = "input/input.txt"; + +type Result = result::Result>; + +fn solve_part1() -> Result { + Ok(1) +} + +fn solve_part2() -> Result { + Ok(1) +} + +fn main() -> Result<()> { + println!("Part 1: {}", solve_part1()?); + println!("Part 2: {}", solve_part2()?); + + Ok(()) +} + +#[cfg(test)] +mod tests { + use super::*; +}