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main.rs
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#[macro_use]
extern crate lazy_static;
extern crate regex;
use regex::Regex;
use std::collections::HashMap;
use std::io;
use std::io::BufRead;
struct Mask {
or: u64,
and: u64,
float: u64,
}
impl Mask {
fn empty() -> Mask {
Mask {
and: u64::MAX,
or: 0,
float: 0,
}
}
fn apply(&self, value: u64) -> u64 {
value & self.and | self.or
}
fn float(&self, value: u64) -> FloatingIterator {
let mut float = self.float;
let mut initial = 0;
while float != 0 {
if float & 1 != 0 {
initial = (initial << 1) + 1;
}
float >>= 1;
}
FloatingIterator {
base: value | self.or,
float: self.float,
cur: initial,
end: false,
}
}
}
struct FloatingIterator {
base: u64,
float: u64,
cur: u32,
end: bool,
}
impl Iterator for FloatingIterator {
type Item = u64;
fn next(&mut self) -> Option<u64> {
if self.end {
None
} else {
let mut float_bit = 1 << 35;
let mut cur = self.cur;
let mut and = u64::MAX;
let mut or = 0;
while float_bit != 0 {
let (and_upd, or_upd, shift) = match (float_bit & self.float, cur & 1) {
(0, _) => (1, 0, 0),
(_, 1) => (0, 0, 1),
(_, _) => (1, 1, 1),
};
and = (and << 1) | and_upd;
or = (or << 1) | or_upd;
cur >>= shift;
float_bit >>= 1;
}
if self.cur == 0 {
self.end = true;
} else {
self.cur -= 1;
}
Some(self.base & and | or)
}
}
}
struct Assignment {
address: u64,
value: u64,
}
enum Instruction {
SetMask(Mask),
Assign(Assignment),
}
use Instruction::*;
fn parse_mask(line: &String) -> Option<Instruction> {
lazy_static! {
static ref RE: Regex = Regex::new(r"mask = ([10X]+)").unwrap();
}
let cap = RE.captures(line.as_str())?;
let mut and: u64 = u64::MAX;
let mut or: u64 = 0;
let mut fluct: u64 = 0;
for ch in cap[1].chars() {
let (and_upd, or_upd, fluct_upd) = match ch {
'1' => (1, 1, 0),
'0' => (0, 0, 0),
_ => (1, 0, 1),
};
and = (and << 1) | and_upd;
or = (or << 1) | or_upd;
fluct = (fluct << 1) | fluct_upd;
}
let mask = Mask {
and: and,
or: or,
float: fluct,
};
Some(SetMask(mask))
}
fn parse_assignment(line: &String) -> Option<Instruction> {
lazy_static! {
static ref RE: Regex = Regex::new(r"mem\[(\d+)\] = (\d+)").unwrap();
}
let cap = RE.captures(line.as_str())?;
let address = cap[1].parse().unwrap();
let value = cap[2].parse().unwrap();
Some(Assign(Assignment { address, value }))
}
fn read_input() -> Vec<Instruction> {
let reader = io::BufReader::new(io::stdin());
reader
.lines()
.map(|line| {
let line = &line.unwrap();
parse_mask(line).or_else(|| parse_assignment(line)).unwrap()
})
.collect()
}
fn main() {
let program = read_input();
let mut mem1: HashMap<u64, u64> = HashMap::new();
let mut mem2: HashMap<u64, u64> = HashMap::new();
let mut mask = Mask::empty();
for command in program {
match command {
SetMask(m) => mask = m,
Assign(a) => {
mem1.insert(a.address, mask.apply(a.value));
for addr in mask.float(a.address) {
mem2.insert(addr, a.value);
}
}
}
}
let sum1: u64 = mem1.values().sum();
let sum2: u64 = mem2.values().sum();
println!("{} {}", sum1, sum2);
}