From e838547874f00a7ee30de0f6abf113edc4cc23a9 Mon Sep 17 00:00:00 2001 From: Curtis McEnroe Date: Mon, 12 Dec 2016 00:33:31 -0500 Subject: Day 12 --- input/day12.txt | 23 ++++++++++ src/bin/day12.rs | 135 +++++++++++++++++++++++++++++++++++++++++++++++++++++++ 2 files changed, 158 insertions(+) create mode 100644 input/day12.txt create mode 100644 src/bin/day12.rs diff --git a/input/day12.txt b/input/day12.txt new file mode 100644 index 0000000..b74bbbc --- /dev/null +++ b/input/day12.txt @@ -0,0 +1,23 @@ +cpy 1 a +cpy 1 b +cpy 26 d +jnz c 2 +jnz 1 5 +cpy 7 c +inc d +dec c +jnz c -2 +cpy a c +inc a +dec b +jnz b -2 +cpy c b +dec d +jnz d -6 +cpy 16 c +cpy 12 d +inc a +dec d +jnz d -2 +dec c +jnz c -5 diff --git a/src/bin/day12.rs b/src/bin/day12.rs new file mode 100644 index 0000000..64b09f8 --- /dev/null +++ b/src/bin/day12.rs @@ -0,0 +1,135 @@ +use std::io::{self, Read}; +use std::str::FromStr; + +#[derive(Clone, Copy)] +enum Operand { + Register(u8), + Immediate(i32), +} + +impl FromStr for Operand { + type Err = (); + fn from_str(s: &str) -> Result { + match s { + "a" => Ok(Operand::Register(0)), + "b" => Ok(Operand::Register(1)), + "c" => Ok(Operand::Register(2)), + "d" => Ok(Operand::Register(3)), + _ => Ok(Operand::Immediate(s.parse().map_err(|_| ())?)), + } + } +} + +#[derive(Clone, Copy)] +enum Operation { + Cpy(Operand, Operand), + Inc(Operand), + Dec(Operand), + Jnz(Operand, Operand), +} + +impl FromStr for Operation { + type Err = (); + fn from_str(s: &str) -> Result { + let mut iter = s.split(' '); + match iter.next() { + Some("cpy") => { + let src = iter.next().ok_or(())?.parse()?; + let dest = iter.next().ok_or(())?.parse()?; + Ok(Operation::Cpy(src, dest)) + }, + Some("inc") => Ok(Operation::Inc(iter.next().ok_or(())?.parse()?)), + Some("dec") => Ok(Operation::Dec(iter.next().ok_or(())?.parse()?)), + Some("jnz") => { + let cond = iter.next().ok_or(())?.parse()?; + let jump = iter.next().ok_or(())?.parse()?; + Ok(Operation::Jnz(cond, jump)) + }, + _ => Err(()), + } + } +} + +#[derive(Default)] +struct Vm { + registers: [i32; 4], + operations: Vec, + index: i32, +} + +impl FromStr for Vm { + type Err = (); + fn from_str(s: &str) -> Result { + let mut vm = Self::default(); + for line in s.lines() { + vm.operations.push(line.parse()?); + } + Ok(vm) + } +} + +impl Vm { + fn step(&mut self) -> bool { + match self.operations[self.index as usize] { + Operation::Cpy(Operand::Immediate(imm), Operand::Register(reg)) => { + self.registers[reg as usize] = imm; + self.index += 1; + }, + Operation::Cpy(Operand::Register(src), Operand::Register(dest)) => { + self.registers[dest as usize] = self.registers[src as usize]; + self.index += 1; + }, + Operation::Inc(Operand::Register(reg)) => { + self.registers[reg as usize] += 1; + self.index += 1; + }, + Operation::Dec(Operand::Register(reg)) => { + self.registers[reg as usize] -= 1; + self.index += 1; + }, + Operation::Jnz(Operand::Immediate(cond), Operand::Immediate(jump)) => { + if cond != 0 { + self.index += jump; + } else { + self.index += 1; + } + }, + Operation::Jnz(Operand::Register(reg), Operand::Immediate(jump)) => { + if self.registers[reg as usize] != 0 { + self.index += jump; + } else { + self.index += 1; + } + }, + _ => panic!("invalid operation"), + } + + (self.index as usize) < self.operations.len() + } +} + +fn solve(input: &str) -> i32 { + let mut vm: Vm = input.parse().unwrap(); + while vm.step() { } + vm.registers[0] +} + +fn main() { + let mut input = String::new(); + io::stdin().read_to_string(&mut input).unwrap(); + + println!("Part 1: {}", solve(&input)); +} + +#[test] +fn part1() { + let input = " +cpy 41 a +inc a +inc a +dec a +jnz a 2 +dec a +"; + assert_eq!(42, solve(input.trim())); +} -- cgit 1.4.1 31cde&follow=1'>Fix C lexer to require a digit in a float literalJune McEnroe Otherwise ".l" is matched as Number. 2021-01-13Support long double in c.shJune McEnroe 2021-01-13Update Terminal.app coloursJune McEnroe God what is this garbage I only changed one colour. 2021-01-13Increase dark white brightness slightlyJune McEnroe 2021-01-13Add hilex example to htagml manualJune McEnroe 2021-01-12Style causal.agency like bin HTMLJune McEnroe 2021-01-12Avoid matching tag text inside HTML elementsJune McEnroe 2021-01-12Use hilex for up -hJune McEnroe 2021-01-12Use hilex for bin HTMLJune McEnroe 2021-01-12Don't output a pre in hilex by defaultJune McEnroe 2021-01-12Move hilex out of hilex directoryJune McEnroe 2021-01-12Consolidate hilex formatters into hilex.cJune McEnroe 2021-01-12Remove hacky tagging from hilexJune McEnroe God that makes the lexers so much simpler. 2021-01-12Add htagml -iJune McEnroe 2021-01-12Render tag index in HTMLJune McEnroe 2021-01-12Add htagml -xJune McEnroe 2021-01-12Prevent matching the same tag twiceJune McEnroe 2021-01-12Process htagml file line by lineJune McEnroe This simplifies some things, adds support for line number tag definitions, and should enable combining htagml with other preprocessors in the future. 2021-01-12Split fields by tab onlyJune McEnroe Also don't fail hard on non-forward-search definitions. 2021-01-12List both Makefile and html.sh under README.7June McEnroe 2021-01-12Add htagml exampleJune McEnroe 2021-01-12Use mandoc and htagml for bin htmlJune McEnroe 2021-01-12Add htagmlJune McEnroe 2021-01-12Replace causal.agency with a simple mdoc pageJune McEnroe 2021-01-11Publish "Using vi"June McEnroe 2021-01-11Enable diff.colorMovedJune McEnroe 2021-01-10Set less search case-insensitiveJune McEnroe 2021-01-10Set EXINITJune McEnroe neovim is laggy as hell in my OpenBSD VM, so I switched to vi so I could type without getting frustrated. 2021-01-09Add c -t flag to print expression typeJune McEnroe Also add missing float case. 2021-01-05Update taglineJune McEnroe