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use std::io::{self, BufRead};
use std::env;
fn read_program() -> Vec<i32> {
let stdin = io::stdin();
stdin.lock().split(b',').map(|v| {
let s = String::from_utf8(v.unwrap()).unwrap();
let u:i32 = s.trim_end().parse().unwrap();
u as i32
}).collect()
}
#[derive(Debug)]
enum Arithm {
Add,
Mul,
LessThan,
Equals,
}
#[derive(Debug)]
enum IO {
In,
Out,
}
#[derive(Debug)]
enum Jmp {
JmpTrue,
JmpFalse,
}
#[derive(Debug, PartialEq)]
enum ParameterMode {
Position,
Immediate,
}
fn arithm(op:Arithm, ip:usize, modes:Vec<ParameterMode>, memory:&mut Vec<i32>) {
if modes[2] == ParameterMode::Immediate {
panic!("Instruction can not store in immediate mode parameter. (IP: {})", ip);
}
let params:Vec<usize> = (0..=2).map(|n| match &modes[n] {
ParameterMode::Position => memory[ip + n + 1] as usize,
ParameterMode::Immediate => ip + n + 1,
}).collect();
let left = params[0];
let right = params[1];
let result = params[2];
match op {
Arithm::Add => memory[result] = memory[left] + memory[right],
Arithm::Mul => memory[result] = memory[left] * memory[right],
Arithm::LessThan => memory[result] = if memory[left] < memory[right] { 1 } else { 0 },
Arithm::Equals => memory[result] = if memory[left] == memory[right] { 1 } else { 0 },
}
}
fn jmp(op:Jmp, ip:usize, modes:Vec<ParameterMode>, memory:&mut Vec<i32>) -> usize {
let params:Vec<usize> = (0..=2).map(|n| match &modes[n] {
ParameterMode::Position => memory[ip + n + 1] as usize,
ParameterMode::Immediate => ip + n + 1,
}).collect();
let value = params[0];
let address = params[1];
match op {
Jmp::JmpTrue => (if memory[value] != 0 { memory[address] as usize } else { ip + 3 }),
Jmp::JmpFalse => (if memory[value] == 0 { memory[address] as usize } else { ip + 3 }),
}
}
fn io(op:IO, ip:usize, modes:Vec<ParameterMode>, memory:&mut Vec<i32>, keyboard:i32) {
match op {
IO::In => {
let address = match &modes[0] {
ParameterMode::Position => memory[ip + 1] as usize,
ParameterMode::Immediate =>
panic!("Cannot store input in immediate mode parameter. (IP: {})", ip),
};
memory[address] = keyboard;
},
IO::Out => {
println!("Output: {}", match &modes[0] {
ParameterMode::Position => memory[memory[ip + 1] as usize],
ParameterMode::Immediate => memory[ip + 1],
});
},
}
}
fn intcode(mut memory:Vec<i32>, keyboard:i32) {
let mut ip = 0;
while ip < memory.len() {
let op = memory[ip] % 100;
let modes:Vec<ParameterMode> = (2..=4).map(|e| memory[ip] / 10i32.pow(e) % 10)
.map(|n| match n {
0 => ParameterMode::Position,
1 => ParameterMode::Immediate,
p => panic!("Invalid parameter mode {} at IP: {}", p, ip),
}).collect();
match op {
1 => { arithm(Arithm::Add, ip, modes, &mut memory); ip += 4 },
2 => { arithm(Arithm::Mul, ip, modes, &mut memory); ip += 4 },
7 => { arithm(Arithm::LessThan, ip, modes, &mut memory); ip += 4 },
8 => { arithm(Arithm::Equals, ip, modes, &mut memory); ip += 4 },
3 => { io(IO::In, ip, modes, &mut memory, keyboard); ip += 2 },
4 => { io(IO::Out, ip, modes, &mut memory, keyboard); ip += 2 },
5 => { ip = jmp(Jmp::JmpTrue, ip, modes, &mut memory); },
6 => { ip = jmp(Jmp::JmpFalse, ip, modes, &mut memory); },
99 => break,
op => panic!("Invalid operation {} at IP: {}", op, ip),
}
}
}
fn first_puzzle(memory:Vec<i32>, input:i32) {
println!("Attemping to solve first puzzle. Using input: {}.", input);
intcode(memory, input);
}
fn second_puzzle(memory:Vec<i32>, input:i32) {
println!("Attemping to solve second puzzle. Using input: {}.", input);
intcode(memory, input);
}
fn main() {
let memory = read_program();
let input = env::args().nth(1);
match input {
Some(i) => {
println!("Attemping to run program using input: {}.", i);
intcode(memory, i.parse().unwrap());
},
None => {
first_puzzle(memory.clone(), 1);
second_puzzle(memory, 5);
}
}
}
|
