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use std::env;
use std::io::BufReader;
use std::io::BufRead;
use std::fs::File;
use std::process;
// extern crate flame;
#[macro_use] extern crate text_io;
type Marble = u32;
struct Circle {
marbles: Vec<Marble>,
current_i: i32,
n: i32
}
impl Circle {
fn get(&self, pos: i32) -> (i32, Marble) {
// let _guard = flame::start_guard("get");
let n = self.marbles.len() as i32;
let i = (pos % n + n) % n;
(i, self.marbles[i as usize])
}
fn set_current(&mut self, pos: i32) {
// let _guard = flame::start_guard("set_current");
let i = (pos % self.n + self.n) % self.n;
self.current_i = i;
}
fn get_current(&self) -> (i32, Marble) {
// let _guard = flame::start_guard("get_current");
let cur = self.marbles[self.current_i as usize];
(self.current_i, cur)
}
fn go_around(&self, delta: i32) -> (i32, Marble) {
// let _guard = flame::start_guard("go_around");
self.get(self.current_i as i32 + delta)
}
fn clockwise(&mut self, delta: i32) -> (i32, Marble) {
// let _guard = flame::start_guard("clockwise");
self.go_around(delta)
}
fn counterclockwise(&mut self, delta: i32) -> (i32, Marble) {
// let _guard = flame::start_guard("counterclockwise");
self.go_around(-delta)
}
fn insert(&mut self, pos: i32, marble: Marble) {
// let _guard = flame::start_guard("insert");
let i = (pos % self.n + self.n) % self.n + 1;
self.marbles.insert(i as usize, marble);
self.n += 1;
}
fn remove(&mut self, pos: i32) {
// let _guard = flame::start_guard("remove");
let (i, m) = self.get(pos);
let (_cur_i, cur) = self.get_current();
if m == cur {
panic!("Removed current marble!");
}
self.marbles.remove(i as usize);
self.n -= 1;
}
}
fn build_circle() -> Circle {
// let _guard = flame::start_guard("build_circle");
let init_marbles: Vec<Marble> = vec![0; 1];
let circle = Circle { marbles: init_marbles, current_i: 0, n: 1 };
circle
}
fn print_state(circle: &Circle, turn: usize) {
print!("[{}] ", turn);
for marble in &circle.marbles {
let (_cur_i, cur) = circle.get_current();
if &cur == marble {
print!(" ({}) ", marble);
} else {
print!(" {} ", marble);
}
}
print!("\n")
}
fn main() {
let args: Vec<String> = env::args().collect();
if args.len() != 2 {
println!("Wrong number of arguments. Provide a file name and worker count.");
process::exit(1);
}
let filename = &args[1];
println!("Using file {} as input.", filename);
let f = match File::open(filename) {
Ok(file) => file,
Err(e) => {
println!("Failed to open file {}. {:?}", filename, e);
process::exit(1);
}
};
let file = BufReader::new(&f);
let lines: Vec<String> = file.lines()
.map(|line| line.expect("Could not parse line."))
.collect();
assert_eq!(lines.len(), 1);
let line = &lines[0];
let (player_count, marble_count): (usize, usize);
scan!(line.bytes() => "{} players; last marble is worth {} points", player_count, marble_count);
let mut scores: Vec<u32> = vec![0; player_count];
let mut circle = build_circle();
let mut turn: usize = 0;
for marble in 1..(marble_count + 1) as Marble {
if marble % 23 == 0 {
scores[turn] += marble;
let (rem_i, rem_m): (i32, Marble) = circle.counterclockwise(7);
circle.remove(rem_i);
scores[turn] += rem_m;
let (new_cur_i, _new_cur) = circle.get(rem_i as i32);
circle.set_current(new_cur_i);
} else {
let (clockwise_i, _clockwise_m) = circle.clockwise(1);
circle.insert(clockwise_i, marble);
circle.set_current(clockwise_i + 1);
}
// print_state(&circle, turn + 1);
if marble % 1000 == 0 {
let progress = 100.0 * (marble as f32) / marble_count as f32;
println!("Debug: Progress: {} %, Processed {} / {}", progress, marble, marble_count);
}
turn = (turn + 1) % player_count;
}
let max_score: &u32 = scores.iter().max().expect("No scores in vector");
println!("Max score: {}", max_score);
// flame::dump_html(&mut File::create("flame-graph.html").unwrap()).unwrap();
}
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