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use std::io::*;
pub trait Io {
fn read_line(&mut self) -> std::io::Result<String>;
fn write_line(&mut self, line: &str) -> std::io::Result<()>;
}
pub struct NullIo {}
impl NullIo {
pub fn new() -> NullIo {
NullIo{}
}
}
impl Io for NullIo {
fn read_line(&mut self) -> std::io::Result<String> {
return Ok(String::new())
}
fn write_line(&mut self, _line: &str) -> std::io::Result<()> {
Ok(())
}
}
pub struct StdIo {}
impl StdIo {
pub fn new() -> StdIo {
StdIo{}
}
}
impl Io for StdIo {
fn read_line(&mut self) -> std::io::Result<String> {
let mut line = String::new();
std::io::stdin().read_line(&mut line)?;
return Ok(line)
}
fn write_line(&mut self, line: &str) -> std::io::Result<()> {
std::io::stdout().write_all(line.as_bytes())
}
}
pub struct StringInStdOut<'a> {
reader: BufReader<&'a[u8]>
}
impl<'a> StringInStdOut<'a> {
pub fn from_string(input: &'a String) -> StringInStdOut<'a> {
StringInStdOut{ reader: BufReader::new(input.as_bytes()) }
}
}
impl<'a> Io for StringInStdOut<'a> {
fn read_line(&mut self) -> std::io::Result<String> {
let mut line = String::new();
self.reader.read_line(&mut line)?;
return Ok(line);
}
fn write_line(&mut self, line: &str) -> std::io::Result<()> {
std::io::stdout().write_all(line.as_bytes())
}
}