113 lines
3.0 KiB
Rust
113 lines
3.0 KiB
Rust
use std::io;
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use std::io::BufRead;
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#[derive(Debug)]
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enum Operation {
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Add { x: i32, y: i32, addr: usize },
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Multiply { x: i32, y: i32, addr: usize },
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Input { value: i32, addr: usize },
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Output { value: i32 },
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}
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#[derive(Debug)]
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enum Mode {
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Immediate,
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Position,
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}
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enum ParameterPosition {
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First,
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Second,
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}
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impl Into<usize> for ParameterPosition {
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fn into(self) -> usize {
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match self {
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ParameterPosition::First => 2,
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ParameterPosition::Second => 3,
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}
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}
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}
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impl Into<Mode> for &char {
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fn into(self) -> Mode {
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match self {
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'0' => Mode::Position,
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'1' => Mode::Immediate,
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_ => unreachable!(),
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}
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}
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}
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fn get_next(input: &Vec<i32>, pos: &mut i32, mode: Mode) -> i32 {
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let value = input[*pos as usize];
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//dbg!(&mode, &pos, value);
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let next = match mode {
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Mode::Position => input[value as usize],
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Mode::Immediate => value,
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};
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//dbg!(&next);
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*pos += 1;
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next
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}
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fn get_mode(raw_opcode: &Vec<char>, pos: ParameterPosition) -> Mode {
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raw_opcode.get::<usize>(pos.into()).unwrap_or(&'0').into()
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}
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fn next_operation(input: &Vec<i32>, pos: &mut i32) -> Option<Operation> {
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let next = get_next(input, pos, Mode::Immediate);
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let mut raw_opcode: Vec<_> = next.to_string().chars().collect();
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raw_opcode.reverse();
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//dbg!(&raw_opcode);
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match raw_opcode[0] {
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'1' => Some(Operation::Add {
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x: get_next(input, pos, get_mode(&raw_opcode, ParameterPosition::First)),
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y: get_next(input, pos, get_mode(&raw_opcode, ParameterPosition::Second)),
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addr: get_next(input, pos, Mode::Immediate) as usize,
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}),
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'2' => Some(Operation::Multiply {
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x: get_next(input, pos, get_mode(&raw_opcode, ParameterPosition::First)),
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y: get_next(input, pos, get_mode(&raw_opcode, ParameterPosition::Second)),
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addr: get_next(input, pos, Mode::Immediate) as usize,
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}),
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'3' => Some(Operation::Input {
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value: 1,
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addr: get_next(input, pos, Mode::Immediate) as usize,
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}),
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'4' => Some(Operation::Output {
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value: get_next(input, pos, get_mode(&raw_opcode, ParameterPosition::First)),
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}),
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'9' => None,
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_ => unreachable!(),
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}
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}
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fn execute(op: Operation, input: &mut Vec<i32>) {
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//dbg!(&op);
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match op {
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Operation::Add { x, y, addr } => input[addr as usize] = x + y,
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Operation::Multiply { x, y, addr } => input[addr as usize] = x * y,
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Operation::Input { value, addr } => input[addr] = value,
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Operation::Output { value } => println!("{}", value),
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}
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}
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pub fn main() {
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let mut input: Vec<i32> = io::stdin()
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.lock()
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.lines()
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.next()
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.unwrap()
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.unwrap()
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.split(",")
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.map(|n| n.parse().unwrap())
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.collect();
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let mut pos = 0;
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//dbg!(&input);
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while let Some(op) = next_operation(&input, &mut pos) {
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execute(op, &mut input);
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}
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}
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