use std::cell::RefCell;
use std::io::{stdin, BufRead, BufReader};
use std::thread::LocalKey;
pub struct StdinReader {
pub lineno: usize,
buf: Vec<String>,
}
impl StdinReader {
pub fn read(&mut self) -> String {
let mut buf = "".to_string();
let stdin = stdin();
let mut reader = BufReader::new(stdin.lock());
reader.read_line(&mut buf).unwrap();
self.lineno += 1;
self.buf.push(buf);
self.buf.last().unwrap().clone()
}
pub fn reread(&self) -> String {
self.buf.last().unwrap().clone()
}
pub fn reread_lines(&self, ln_begin: usize, ln_end: usize) -> Vec<String> {
self.buf[ln_begin - 1..=ln_end - 1].to_vec()
}
}
thread_local! {
static READER: RefCell<StdinReader> = RefCell::new(StdinReader{ lineno: 0, buf: vec![] });
}
#[derive(Debug)]
pub struct GlobalStdin(LocalKey<RefCell<StdinReader>>);
pub static GLOBAL_STDIN: GlobalStdin = GlobalStdin(READER);
impl GlobalStdin {
pub fn read(&'static self) -> String {
self.0.with(|s| s.borrow_mut().read())
}
pub fn reread(&'static self) -> String {
self.0.with(|s| s.borrow().reread())
}
pub fn reread_lines(&'static self, ln_begin: usize, ln_end: usize) -> Vec<String> {
self.0
.with(|s| s.borrow_mut().reread_lines(ln_begin, ln_end))
}
}