2019: intcode: split to own module
This commit is contained in:
parent
e468ec2952
commit
72444351a8
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@ -3,69 +3,52 @@ use std::fmt::Write;
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use aoc::err;
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use aoc::Result;
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const INPUT: &str = include_str!("../input/day02.txt");
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const PART2_EXPECTED: usize = 19_690_720;
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use crate::intcode::{parse_memory, Intcode};
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fn parse_intcode(input: &str) -> Result<Vec<usize>> {
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input
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.trim_end()
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.split(',')
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.map(|x| x.parse().map_err(|e| err!("couldn't parse int: {}", e)))
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.collect()
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}
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const INPUT: &str = include_str!("../input/day02.txt");
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const PART2_EXPECTED: i64 = 19_690_720;
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pub fn run() -> Result<String> {
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let mut res = String::with_capacity(128);
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let intcode = parse_intcode(INPUT)?;
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let memory = parse_memory(INPUT)?;
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writeln!(res, "part 1: {}", part1(&mut intcode.clone())?)?;
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writeln!(res, "part 2: {}", part2(&intcode, PART2_EXPECTED)?)?;
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writeln!(res, "part 1: {}", part1(memory.clone())?)?;
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writeln!(res, "part 2: {}", part2(&memory, PART2_EXPECTED)?)?;
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Ok(res)
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}
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fn eval(intcode: &mut [usize]) -> Result<()> {
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let mut pc = 0;
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while intcode[pc] != 99 {
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let op1 = intcode[pc + 1];
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let op2 = intcode[pc + 2];
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let res = intcode[pc + 3];
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match intcode[pc] {
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1 => intcode[res] = intcode[op1] + intcode[op2],
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2 => intcode[res] = intcode[op1] * intcode[op2],
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_ => return Err(err!("unknown opcode: {}", intcode[pc])),
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};
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pc += 4;
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}
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Ok(())
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}
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fn part1(input: &mut Vec<usize>) -> Result<usize> {
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fn part1(mut input: Vec<i64>) -> Result<i64> {
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input[1] = 12;
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input[2] = 2;
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eval(input)?;
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let mut intcode = Intcode::with_memory(input);
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intcode.run()?;
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Ok(input[0])
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intcode
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.get_day02_output()
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.ok_or_else(|| err!("intcode memory was empty!"))
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}
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fn part2(input: &[usize], res: usize) -> Result<usize> {
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fn part2(input: &[i64], res: i64) -> Result<i64> {
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for (noun, verb) in (0..=99).flat_map(|noun| (0..=99).map(move |verb| (noun, verb))) {
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let mut test_input = input.to_vec();
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test_input[1] = noun;
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test_input[2] = verb;
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eval(&mut test_input)?;
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let mut intcode = Intcode::with_memory(test_input);
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intcode.run()?;
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if test_input[0] == res {
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match intcode.get_day02_output() {
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Some(val) => {
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if val == res {
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return Ok(noun * 100 + verb);
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}
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}
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None => return Err(err!("intcode memory was empty!")),
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}
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}
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Err(err!(
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"couldn't find noun/verb combination that produces {}",
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@ -79,36 +62,39 @@ mod tests {
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#[test]
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fn part1_provided() {
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let mut intcode = parse_intcode("1,9,10,3,2,3,11,0,99,30,40,50").unwrap();
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eval(&mut intcode).unwrap();
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assert_eq!(intcode, &[3500, 9, 10, 70, 2, 3, 11, 0, 99, 30, 40, 50]);
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let mut intcode = Intcode::new("1,9,10,3,2,3,11,0,99,30,40,50").unwrap();
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intcode.run().unwrap();
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assert_eq!(
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&intcode.memory,
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&[3500, 9, 10, 70, 2, 3, 11, 0, 99, 30, 40, 50]
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);
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let mut intcode = parse_intcode("1,0,0,0,99").unwrap();
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eval(&mut intcode).unwrap();
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assert_eq!(intcode, &[2, 0, 0, 0, 99]);
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let mut intcode = Intcode::new("1,0,0,0,99").unwrap();
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intcode.run().unwrap();
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assert_eq!(&intcode.memory, &[2, 0, 0, 0, 99]);
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let mut intcode = parse_intcode("2,3,0,3,99").unwrap();
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eval(&mut intcode).unwrap();
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assert_eq!(intcode, &[2, 3, 0, 6, 99]);
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let mut intcode = Intcode::new("2,3,0,3,99").unwrap();
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intcode.run().unwrap();
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assert_eq!(&intcode.memory, &[2, 3, 0, 6, 99]);
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let mut intcode = parse_intcode("2,4,4,5,99,0").unwrap();
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eval(&mut intcode).unwrap();
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assert_eq!(intcode, &[2, 4, 4, 5, 99, 9801]);
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let mut intcode = Intcode::new("2,4,4,5,99,0").unwrap();
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intcode.run().unwrap();
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assert_eq!(&intcode.memory, &[2, 4, 4, 5, 99, 9801]);
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let mut intcode = parse_intcode("1,1,1,4,99,5,6,0,99").unwrap();
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eval(&mut intcode).unwrap();
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assert_eq!(intcode, &[30, 1, 1, 4, 2, 5, 6, 0, 99]);
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let mut intcode = Intcode::new("1,1,1,4,99,5,6,0,99").unwrap();
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intcode.run().unwrap();
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assert_eq!(&intcode.memory, &[30, 1, 1, 4, 2, 5, 6, 0, 99]);
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}
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#[test]
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fn part1_real() {
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let mut intcode = parse_intcode(INPUT).unwrap();
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assert_eq!(part1(&mut intcode).unwrap(), 6568671);
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let memory = parse_memory(INPUT).unwrap();
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assert_eq!(part1(memory).unwrap(), 6568671);
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}
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#[test]
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fn part2_real() {
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let intcode = parse_intcode(INPUT).unwrap();
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assert_eq!(part2(&intcode, PART2_EXPECTED).unwrap(), 3951);
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let memory = parse_memory(INPUT).unwrap();
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assert_eq!(part2(&memory, PART2_EXPECTED).unwrap(), 3951);
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}
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}
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@ -3,6 +3,8 @@ use std::fmt::Write;
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use aoc::err;
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use aoc::Result;
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use crate::intcode::Intcode;
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const INPUT: &str = include_str!("../input/day05.txt");
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pub fn run() -> Result<String> {
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@ -19,7 +21,7 @@ fn part1(input: &str) -> Result<i64> {
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intcode.add_input(1);
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intcode.run()?;
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intcode
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.get_output()
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.get_day05_output()
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.ok_or_else(|| err!("intcode gave no output"))
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}
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@ -28,291 +30,10 @@ fn part2(input: &str) -> Result<i64> {
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intcode.add_input(5);
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intcode.run()?;
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intcode
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.get_output()
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.get_day05_output()
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.ok_or_else(|| err!("intcode gave no output"))
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}
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enum Parameter {
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Position(usize),
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Immediate(i64),
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}
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impl Parameter {
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fn new(mode: i64, val: Option<i64>) -> Result<Self> {
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let val = val.ok_or_else(|| err!("parameter value out of bounds"))?;
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let mode = mode % 10;
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match mode {
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0 => {
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if val < 0 {
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Err(err!("negative value for position parameter: {}", val))
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} else {
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let val = val as usize;
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Ok(Parameter::Position(val))
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}
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}
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1 => Ok(Parameter::Immediate(val)),
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_ => Err(err!("wrong mode for parameter: {}", mode)),
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}
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}
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fn get(&self, memory: &[i64]) -> Result<i64> {
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match self {
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Parameter::Position(address) => match memory.get(*address) {
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Some(val) => Ok(*val),
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None => Err(err!("read out of bounds at address {}", address)),
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},
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Parameter::Immediate(value) => Ok(*value),
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}
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}
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fn set(&self, memory: &mut [i64], value: i64) -> Result<()> {
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match self {
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Parameter::Position(address) => {
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let cell = memory
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.get_mut(*address)
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.ok_or_else(|| err!("memory write out of bounds"))?;
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*cell = value;
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Ok(())
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}
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Parameter::Immediate(_) => Err(err!("cannot write to immediate parameter")),
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}
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}
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}
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enum Opcode {
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Add(Parameter, Parameter, Parameter),
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Multiply(Parameter, Parameter, Parameter),
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Input(Parameter),
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Output(Parameter),
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JumpTrue(Parameter, Parameter),
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JumpFalse(Parameter, Parameter),
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LessThan(Parameter, Parameter, Parameter),
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Equals(Parameter, Parameter, Parameter),
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Halt,
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}
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struct Intcode {
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memory: Vec<i64>,
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input: Vec<i64>,
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output: Vec<i64>,
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ip: usize,
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next_input: usize,
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}
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impl Intcode {
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fn new(input: &str) -> Result<Self> {
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let memory = input
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.trim_end()
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.split(',')
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.map(|x| x.parse().map_err(|e| err!("couldn't parse int: {}", e)))
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.collect::<Result<Vec<i64>>>()?;
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Ok(Intcode::with_memory(memory))
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}
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fn with_memory(memory: Vec<i64>) -> Self {
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Intcode {
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memory,
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input: Vec::new(),
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output: Vec::new(),
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ip: 0,
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next_input: 0,
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}
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}
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fn add_input(&mut self, value: i64) {
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self.input.push(value);
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}
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fn get_opcode(&self) -> Result<Opcode> {
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let instruction = self.memory[self.ip];
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let opcode = instruction % 100;
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let mode1 = instruction / 100;
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let mode2 = instruction / 1000;
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let mode3 = instruction / 10000;
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match opcode {
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1 => {
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let op1 = Parameter::new(mode1, self.memory.get(self.ip + 1).copied())?;
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let op2 = Parameter::new(mode2, self.memory.get(self.ip + 2).copied())?;
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let dst = Parameter::new(mode3, self.memory.get(self.ip + 3).copied())?;
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if let Parameter::Immediate(_) = dst {
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Err(err!("add: destination parameter can't be immediate"))
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} else {
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Ok(Opcode::Add(op1, op2, dst))
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}
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}
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2 => {
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let op1 = Parameter::new(mode1, self.memory.get(self.ip + 1).copied())?;
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let op2 = Parameter::new(mode2, self.memory.get(self.ip + 2).copied())?;
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let dst = Parameter::new(mode3, self.memory.get(self.ip + 3).copied())?;
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if let Parameter::Immediate(_) = dst {
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Err(err!("multiply: destination parameter can't be immediate"))
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} else {
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Ok(Opcode::Multiply(op1, op2, dst))
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}
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}
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3 => {
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let dst = Parameter::new(mode1, self.memory.get(self.ip + 1).copied())?;
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if let Parameter::Immediate(_) = dst {
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Err(err!("input: destination parameter can't be immediate"))
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} else {
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Ok(Opcode::Input(dst))
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}
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}
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4 => {
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let op = Parameter::new(mode1, self.memory.get(self.ip + 1).copied())?;
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Ok(Opcode::Output(op))
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}
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5 => {
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let test = Parameter::new(mode1, self.memory.get(self.ip + 1).copied())?;
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let dst = Parameter::new(mode2, self.memory.get(self.ip + 2).copied())?;
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Ok(Opcode::JumpTrue(test, dst))
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}
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6 => {
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let test = Parameter::new(mode1, self.memory.get(self.ip + 1).copied())?;
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let dst = Parameter::new(mode2, self.memory.get(self.ip + 2).copied())?;
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Ok(Opcode::JumpFalse(test, dst))
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}
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7 => {
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let op1 = Parameter::new(mode1, self.memory.get(self.ip + 1).copied())?;
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let op2 = Parameter::new(mode2, self.memory.get(self.ip + 2).copied())?;
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let dst = Parameter::new(mode3, self.memory.get(self.ip + 3).copied())?;
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if let Parameter::Immediate(_) = dst {
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Err(err!("less than: destination parameter can't be immediate"))
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} else {
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Ok(Opcode::LessThan(op1, op2, dst))
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}
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}
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8 => {
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let op1 = Parameter::new(mode1, self.memory.get(self.ip + 1).copied())?;
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let op2 = Parameter::new(mode2, self.memory.get(self.ip + 2).copied())?;
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let dst = Parameter::new(mode3, self.memory.get(self.ip + 3).copied())?;
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if let Parameter::Immediate(_) = dst {
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Err(err!("equals: destination parameter can't be immediate"))
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} else {
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Ok(Opcode::Equals(op1, op2, dst))
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}
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}
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99 => Ok(Opcode::Halt),
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_ => Err(err!("unknown opcode: {}", opcode)),
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}
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}
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fn run(&mut self) -> Result<()> {
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loop {
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if self.ip >= self.memory.len() {
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return Err(err!("reached end of program without halting"));
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}
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let opcode = self.get_opcode()?;
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match opcode {
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Opcode::Add(op1, op2, dst) => {
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let val1 = op1.get(&self.memory)?;
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let val2 = op2.get(&self.memory)?;
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dst.set(&mut self.memory, val1 + val2)?;
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self.ip += 4;
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}
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Opcode::Multiply(op1, op2, dst) => {
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let val1 = op1.get(&self.memory)?;
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let val2 = op2.get(&self.memory)?;
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dst.set(&mut self.memory, val1 * val2)?;
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self.ip += 4;
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}
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Opcode::Input(dst) => {
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let input = if self.next_input < self.input.len() {
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let res = self.input[self.next_input];
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self.next_input += 1;
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Ok(res)
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} else {
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Err(err!("tried to read input but it was empty"))
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}?;
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dst.set(&mut self.memory, input)?;
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self.ip += 2;
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}
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Opcode::Output(op) => {
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let val = op.get(&self.memory)?;
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self.output.push(val);
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self.ip += 2;
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}
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Opcode::JumpTrue(test, dst) => {
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let val = test.get(&self.memory)?;
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let dst = dst.get(&self.memory)?;
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if dst < 0 {
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return Err(err!("dst must be a valid address: {}", dst));
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}
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if val != 0 {
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self.ip = dst as usize;
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} else {
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self.ip += 3;
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}
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}
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Opcode::JumpFalse(test, dst) => {
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let val = test.get(&self.memory)?;
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let dst = dst.get(&self.memory)?;
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if dst < 0 {
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return Err(err!("dst must be a valid address: {}", dst));
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}
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if val == 0 {
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self.ip = dst as usize;
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} else {
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self.ip += 3;
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}
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}
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Opcode::LessThan(op1, op2, dst) => {
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let val1 = op1.get(&self.memory)?;
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let val2 = op2.get(&self.memory)?;
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let res = if val1 < val2 { 1 } else { 0 };
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dst.set(&mut self.memory, res)?;
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self.ip += 4;
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}
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Opcode::Equals(op1, op2, dst) => {
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let val1 = op1.get(&self.memory)?;
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let val2 = op2.get(&self.memory)?;
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let res = if val1 == val2 { 1 } else { 0 };
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dst.set(&mut self.memory, res)?;
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self.ip += 4;
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}
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Opcode::Halt => break Ok(()),
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}
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}
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}
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fn get_output(&self) -> Option<i64> {
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for (i, out) in self.output.iter().enumerate() {
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if i < self.output.len() - 1 {
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assert_eq!(*out, 0);
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} else {
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return Some(*out);
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}
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}
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None
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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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246
aoc2019/src/intcode/mod.rs
Normal file
246
aoc2019/src/intcode/mod.rs
Normal file
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@ -0,0 +1,246 @@
|
|||
use aoc::err;
|
||||
use aoc::Result;
|
||||
|
||||
mod parameter;
|
||||
|
||||
use parameter::Parameter;
|
||||
|
||||
pub fn parse_memory(s: &str) -> Result<Vec<i64>> {
|
||||
s.trim_end()
|
||||
.split(',')
|
||||
.map(|x| x.parse().map_err(|e| err!("couldn't parse int: {}", e)))
|
||||
.collect()
|
||||
}
|
||||
|
||||
enum Opcode {
|
||||
Add(Parameter, Parameter, Parameter),
|
||||
Multiply(Parameter, Parameter, Parameter),
|
||||
Input(Parameter),
|
||||
Output(Parameter),
|
||||
JumpTrue(Parameter, Parameter),
|
||||
JumpFalse(Parameter, Parameter),
|
||||
LessThan(Parameter, Parameter, Parameter),
|
||||
Equals(Parameter, Parameter, Parameter),
|
||||
Halt,
|
||||
}
|
||||
|
||||
pub struct Intcode {
|
||||
pub memory: Vec<i64>,
|
||||
input: Vec<i64>,
|
||||
pub output: Vec<i64>,
|
||||
ip: usize,
|
||||
next_input: usize,
|
||||
}
|
||||
|
||||
impl Intcode {
|
||||
pub fn new(input: &str) -> Result<Self> {
|
||||
let memory = parse_memory(input)?;
|
||||
|
||||
Ok(Intcode::with_memory(memory))
|
||||
}
|
||||
|
||||
pub fn with_memory(memory: Vec<i64>) -> Self {
|
||||
Intcode {
|
||||
memory,
|
||||
input: Vec::new(),
|
||||
output: Vec::new(),
|
||||
ip: 0,
|
||||
next_input: 0,
|
||||
}
|
||||
}
|
||||
|
||||
pub fn add_input(&mut self, value: i64) {
|
||||
self.input.push(value);
|
||||
}
|
||||
|
||||
fn get_opcode(&self) -> Result<Opcode> {
|
||||
let instruction = self.memory[self.ip];
|
||||
|
||||
let opcode = instruction % 100;
|
||||
let mode1 = instruction / 100;
|
||||
let mode2 = instruction / 1000;
|
||||
let mode3 = instruction / 10000;
|
||||
match opcode {
|
||||
1 => {
|
||||
let op1 = Parameter::new(mode1, self.memory.get(self.ip + 1).copied())?;
|
||||
let op2 = Parameter::new(mode2, self.memory.get(self.ip + 2).copied())?;
|
||||
let dst = Parameter::new(mode3, self.memory.get(self.ip + 3).copied())?;
|
||||
|
||||
if let Parameter::Immediate(_) = dst {
|
||||
Err(err!("add: destination parameter can't be immediate"))
|
||||
} else {
|
||||
Ok(Opcode::Add(op1, op2, dst))
|
||||
}
|
||||
}
|
||||
2 => {
|
||||
let op1 = Parameter::new(mode1, self.memory.get(self.ip + 1).copied())?;
|
||||
let op2 = Parameter::new(mode2, self.memory.get(self.ip + 2).copied())?;
|
||||
let dst = Parameter::new(mode3, self.memory.get(self.ip + 3).copied())?;
|
||||
|
||||
if let Parameter::Immediate(_) = dst {
|
||||
Err(err!("multiply: destination parameter can't be immediate"))
|
||||
} else {
|
||||
Ok(Opcode::Multiply(op1, op2, dst))
|
||||
}
|
||||
}
|
||||
3 => {
|
||||
let dst = Parameter::new(mode1, self.memory.get(self.ip + 1).copied())?;
|
||||
|
||||
if let Parameter::Immediate(_) = dst {
|
||||
Err(err!("input: destination parameter can't be immediate"))
|
||||
} else {
|
||||
Ok(Opcode::Input(dst))
|
||||
}
|
||||
}
|
||||
4 => {
|
||||
let op = Parameter::new(mode1, self.memory.get(self.ip + 1).copied())?;
|
||||
|
||||
Ok(Opcode::Output(op))
|
||||
}
|
||||
5 => {
|
||||
let test = Parameter::new(mode1, self.memory.get(self.ip + 1).copied())?;
|
||||
let dst = Parameter::new(mode2, self.memory.get(self.ip + 2).copied())?;
|
||||
|
||||
Ok(Opcode::JumpTrue(test, dst))
|
||||
}
|
||||
6 => {
|
||||
let test = Parameter::new(mode1, self.memory.get(self.ip + 1).copied())?;
|
||||
let dst = Parameter::new(mode2, self.memory.get(self.ip + 2).copied())?;
|
||||
|
||||
Ok(Opcode::JumpFalse(test, dst))
|
||||
}
|
||||
7 => {
|
||||
let op1 = Parameter::new(mode1, self.memory.get(self.ip + 1).copied())?;
|
||||
let op2 = Parameter::new(mode2, self.memory.get(self.ip + 2).copied())?;
|
||||
let dst = Parameter::new(mode3, self.memory.get(self.ip + 3).copied())?;
|
||||
|
||||
if let Parameter::Immediate(_) = dst {
|
||||
Err(err!("less than: destination parameter can't be immediate"))
|
||||
} else {
|
||||
Ok(Opcode::LessThan(op1, op2, dst))
|
||||
}
|
||||
}
|
||||
8 => {
|
||||
let op1 = Parameter::new(mode1, self.memory.get(self.ip + 1).copied())?;
|
||||
let op2 = Parameter::new(mode2, self.memory.get(self.ip + 2).copied())?;
|
||||
let dst = Parameter::new(mode3, self.memory.get(self.ip + 3).copied())?;
|
||||
|
||||
if let Parameter::Immediate(_) = dst {
|
||||
Err(err!("equals: destination parameter can't be immediate"))
|
||||
} else {
|
||||
Ok(Opcode::Equals(op1, op2, dst))
|
||||
}
|
||||
}
|
||||
99 => Ok(Opcode::Halt),
|
||||
_ => Err(err!("unknown opcode: {}", opcode)),
|
||||
}
|
||||
}
|
||||
|
||||
pub fn run(&mut self) -> Result<()> {
|
||||
loop {
|
||||
if self.ip >= self.memory.len() {
|
||||
return Err(err!("reached end of program without halting"));
|
||||
}
|
||||
|
||||
let opcode = self.get_opcode()?;
|
||||
|
||||
match opcode {
|
||||
Opcode::Add(op1, op2, dst) => {
|
||||
let val1 = op1.get(&self.memory)?;
|
||||
let val2 = op2.get(&self.memory)?;
|
||||
|
||||
dst.set(&mut self.memory, val1 + val2)?;
|
||||
|
||||
self.ip += 4;
|
||||
}
|
||||
Opcode::Multiply(op1, op2, dst) => {
|
||||
let val1 = op1.get(&self.memory)?;
|
||||
let val2 = op2.get(&self.memory)?;
|
||||
|
||||
dst.set(&mut self.memory, val1 * val2)?;
|
||||
|
||||
self.ip += 4;
|
||||
}
|
||||
Opcode::Input(dst) => {
|
||||
let input = if self.next_input < self.input.len() {
|
||||
let res = self.input[self.next_input];
|
||||
self.next_input += 1;
|
||||
Ok(res)
|
||||
} else {
|
||||
Err(err!("tried to read input but it was empty"))
|
||||
}?;
|
||||
dst.set(&mut self.memory, input)?;
|
||||
|
||||
self.ip += 2;
|
||||
}
|
||||
Opcode::Output(op) => {
|
||||
let val = op.get(&self.memory)?;
|
||||
self.output.push(val);
|
||||
|
||||
self.ip += 2;
|
||||
}
|
||||
Opcode::JumpTrue(test, dst) => {
|
||||
let val = test.get(&self.memory)?;
|
||||
let dst = dst.get(&self.memory)?;
|
||||
if dst < 0 {
|
||||
return Err(err!("dst must be a valid address: {}", dst));
|
||||
}
|
||||
|
||||
if val != 0 {
|
||||
self.ip = dst as usize;
|
||||
} else {
|
||||
self.ip += 3;
|
||||
}
|
||||
}
|
||||
Opcode::JumpFalse(test, dst) => {
|
||||
let val = test.get(&self.memory)?;
|
||||
let dst = dst.get(&self.memory)?;
|
||||
if dst < 0 {
|
||||
return Err(err!("dst must be a valid address: {}", dst));
|
||||
}
|
||||
|
||||
if val == 0 {
|
||||
self.ip = dst as usize;
|
||||
} else {
|
||||
self.ip += 3;
|
||||
}
|
||||
}
|
||||
Opcode::LessThan(op1, op2, dst) => {
|
||||
let val1 = op1.get(&self.memory)?;
|
||||
let val2 = op2.get(&self.memory)?;
|
||||
|
||||
let res = if val1 < val2 { 1 } else { 0 };
|
||||
dst.set(&mut self.memory, res)?;
|
||||
|
||||
self.ip += 4;
|
||||
}
|
||||
Opcode::Equals(op1, op2, dst) => {
|
||||
let val1 = op1.get(&self.memory)?;
|
||||
let val2 = op2.get(&self.memory)?;
|
||||
|
||||
let res = if val1 == val2 { 1 } else { 0 };
|
||||
dst.set(&mut self.memory, res)?;
|
||||
|
||||
self.ip += 4;
|
||||
}
|
||||
Opcode::Halt => break Ok(()),
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
pub fn get_day02_output(&self) -> Option<i64> {
|
||||
self.memory.get(0).copied()
|
||||
}
|
||||
|
||||
pub fn get_day05_output(&self) -> Option<i64> {
|
||||
for (i, out) in self.output.iter().enumerate() {
|
||||
if i < self.output.len() - 1 {
|
||||
assert_eq!(*out, 0);
|
||||
} else {
|
||||
return Some(*out);
|
||||
}
|
||||
}
|
||||
|
||||
None
|
||||
}
|
||||
}
|
||||
50
aoc2019/src/intcode/parameter.rs
Normal file
50
aoc2019/src/intcode/parameter.rs
Normal file
|
|
@ -0,0 +1,50 @@
|
|||
use aoc::err;
|
||||
use aoc::Result;
|
||||
|
||||
pub enum Parameter {
|
||||
Position(usize),
|
||||
Immediate(i64),
|
||||
}
|
||||
|
||||
impl Parameter {
|
||||
pub fn new(mode: i64, val: Option<i64>) -> Result<Self> {
|
||||
let val = val.ok_or_else(|| err!("parameter value out of bounds"))?;
|
||||
let mode = mode % 10;
|
||||
|
||||
match mode {
|
||||
0 => {
|
||||
if val < 0 {
|
||||
Err(err!("negative value for position parameter: {}", val))
|
||||
} else {
|
||||
let val = val as usize;
|
||||
Ok(Parameter::Position(val))
|
||||
}
|
||||
}
|
||||
1 => Ok(Parameter::Immediate(val)),
|
||||
_ => Err(err!("wrong mode for parameter: {}", mode)),
|
||||
}
|
||||
}
|
||||
|
||||
pub fn get(&self, memory: &[i64]) -> Result<i64> {
|
||||
match self {
|
||||
Parameter::Position(address) => match memory.get(*address) {
|
||||
Some(val) => Ok(*val),
|
||||
None => Err(err!("read out of bounds at address {}", address)),
|
||||
},
|
||||
Parameter::Immediate(value) => Ok(*value),
|
||||
}
|
||||
}
|
||||
|
||||
pub fn set(&self, memory: &mut [i64], value: i64) -> Result<()> {
|
||||
match self {
|
||||
Parameter::Position(address) => {
|
||||
let cell = memory
|
||||
.get_mut(*address)
|
||||
.ok_or_else(|| err!("memory write out of bounds"))?;
|
||||
*cell = value;
|
||||
Ok(())
|
||||
}
|
||||
Parameter::Immediate(_) => Err(err!("cannot write to immediate parameter")),
|
||||
}
|
||||
}
|
||||
}
|
||||
|
|
@ -1,3 +1,5 @@
|
|||
mod intcode;
|
||||
|
||||
pub mod day01;
|
||||
pub mod day02;
|
||||
pub mod day03;
|
||||
|
|
|
|||
Loading…
Reference in a new issue