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use std::collections::{HashMap, HashSet};
use std::io::{Read, Write};
use std::net::TcpStream;
static USERNAME : &str = "deki";
static PASSWORD : &str = "xxxxxxxx";
struct GameState {
id: usize,
map: Vec<Vec<Option<usize>>>,
heads: HashMap<usize, (usize,usize)>,
}
impl GameState {
fn new(id: usize, width: usize, height: usize) -> GameState {
let line = vec![None; width];
let map = vec![line; height];
GameState { id, map, heads: HashMap::new() }
}
fn update_pos(&mut self, id: usize, x: usize, y: usize) {
self.map[y][x] = Some(id);
self.heads.insert(id, (x,y));
}
fn player_died(&mut self, id: usize) {
for row in self.map.iter_mut() {
for col in row {
if Some(id) == *col {
*col = None;
}
}
}
self.heads.remove(&id);
}
fn neighboring_opponents(&self, pos: (usize, usize)) -> bool {
let height = self.map.len();
let width = self.map[0].len();
for (id, opp_pos) in &self.heads {
if *id == self.id {
continue;
}
if ((opp_pos.0 - 1 + width) % width, opp_pos.1) == pos { return true; }
if ((opp_pos.0 + 1) % width, opp_pos.1) == pos { return true; }
if (opp_pos.0, (opp_pos.1 - 1 + height) % height) == pos { return true; }
if (opp_pos.0, (opp_pos.1 + 1) % height) == pos { return true; }
}
false
}
fn reachable(&self, reached: &mut HashSet<(usize,usize)>, pos: (usize,usize), consider_neighbors: bool) -> usize {
if self.map[pos.1][pos.0].is_some() || reached.contains(&pos) || (consider_neighbors && self.neighboring_opponents(pos)) {
return reached.len();
}
let height = self.map.len();
let width = self.map[0].len();
reached.insert(pos);
self.reachable(reached, ((pos.0+width-1)%width, pos.1), consider_neighbors);
self.reachable(reached, ((pos.0+1)%width, pos.1), consider_neighbors);
self.reachable(reached, (pos.0, (pos.1+height-1)%height), consider_neighbors);
self.reachable(reached, (pos.0, (pos.1+1)%height), consider_neighbors);
reached.len()
}
fn direction_with_max_distance(&self, consider_neighbors: bool) -> Option<String> {
let (pos_x, pos_y) = *self.heads.get(&self.id).expect("current position not found");
let height = self.map.len();
let width = self.map[0].len();
let mut distances = HashMap::new();
distances.insert("up", self.reachable(&mut HashSet::new(), (pos_x, (pos_y + height - 1) % height), consider_neighbors));
distances.insert("down", self.reachable(&mut HashSet::new(), (pos_x, (pos_y + 1) % height), consider_neighbors));
distances.insert("left", self.reachable(&mut HashSet::new(), ((pos_x + width - 1) % width, pos_y), consider_neighbors));
distances.insert("right", self.reachable(&mut HashSet::new(), ((pos_x + 1) % width, pos_y), consider_neighbors));
distances.iter()
.filter(|x| *x.1 > 0)
.max_by_key(|x| x.1)
.map(|x| x.0.to_string())
}
fn next_move(&mut self) -> String {
for consider_neighbors in [true, false] {
if let Some(direction) = self.direction_with_max_distance(consider_neighbors) {
return direction;
}
}
"up".to_string()
}
}
fn main() {
let mut stream = TcpStream::connect("gpn-tron.duckdns.org:4000").expect("Couldn't connect to the server...");
let mut game = GameState::new(0, 0, 0);
loop {
let mut buf = [0; 10240];
let rx_len = stream.read(&mut buf).expect("read error");
if rx_len == 0 {
println!("end of data");
return;
}
let buf = &buf[..rx_len];
let received_str = match std::str::from_utf8(buf) {
Ok(s) => s,
Err(_) => {
println!("received invalid utf8");
continue;
}
};
//println!("received {rx_len} bytes: '{received_str}'");
let mut lines = received_str.split('\n').collect::<Vec<&str>>();
let remainder = lines.pop().expect("no line received");
if !remainder.is_empty() {
panic!("received string contains an unterminated line: {remainder}");
}
for line in &lines {
let args = line.split('|').collect::<Vec<&str>>();
let cmd = args[0];
//println!("received command: {cmd}");
match cmd {
"motd" => {
println!("MOTD: {}", args[1]);
let _ = stream.write(&format!("join|{USERNAME}|{PASSWORD}\n").into_bytes());
let _ = stream.flush();
},
"error" => {
println!("Error: {}", args[1]);
return;
},
"tick" => {
//println!("tick");
let next_move = game.next_move();
let _ = stream.write(&format!("move|{}\n", next_move).into_bytes());
let _ = stream.flush();
//println!("moving to: {next_move}");
},
"win" => { println!("YOU WON (wins: {}, losses: {})", args[1], args[2]); },
"lose" => { println!("YOU LOSE (wins: {}, losses: {})", args[1], args[2]); },
"game" => {
let width = args[1].parse::<usize>().expect(&format!("failed to parse width: {}", args[1]));
let height = args[2].parse::<usize>().expect(&format!("failed to parse height: {}", args[2]));
let id = args[3].parse::<usize>().expect(&format!("failed to parse id: {}", args[3]));
game = GameState::new(id, width, height);
println!("\nNEW GAME {width}x{height} (id: {id})!");
},
"pos" => {
let id = args[1].parse::<usize>().expect(&format!("failed to parse id: {}", args[1]));
let x = args[2].parse::<usize>().expect(&format!("failed to parse x: {}", args[2]));
let y = args[3].parse::<usize>().expect(&format!("failed to parse y: {}", args[3]));
//println!("received pos for {id}: {x}/{y}");
game.update_pos(id, x, y);
}
"message" => { println!("message from {}: {}", args[1], args[2]); },
"die" => {
for player in args.iter().skip(1) {
game.player_died(player.parse::<usize>().expect("failed to parse player id"));
}
println!("players died: {}", args[1..].join(", "));
},
_ => println!("unsupported command: {cmd}"),
}
}
}
}
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