use std::io::{stdout, BufWriter, Write}; fn main() { let out = stdout(); let mut out = BufWriter::new(out.lock()); inputv! { t:usize } for _ in 0..t { inputv!(a: usize, b: usize); let r = solve(a, b); writeln!(out, "{}", r.len()).unwrap(); for i in r { write!(out, "{} ", i).unwrap(); } writeln!(out); } } fn solve(mut a: usize, b: usize) -> Vec { let mut r = vec![]; while a < b { for i in (0..62).rev() { let buf = 2_usize.pow(i); if a % buf == 0 && a + buf <= b { r.push(buf); a += buf; break; } } } r } //https://github.com/manta1130/competitive-template-rs pub mod input { use std::cell::RefCell; use std::io; pub const SPLIT_DELIMITER: char = ' '; pub use std::io::prelude::*; #[macro_export] thread_local! { pub static INPUT_BUFFER:RefCell>=RefCell::new(std::collections::VecDeque::new()); } #[macro_export] #[allow(unused_macros)] macro_rules! inputv { ( $($x:ident : $t:ty),*) => { $( INPUT_BUFFER.with(|p| if p.borrow().len()==0{ let temp_str = input_line_str(); let mut split_result_iter = temp_str.split(SPLIT_DELIMITER).map(|q|q.to_string()).collect::>(); p.borrow_mut().append(&mut split_result_iter) }); let mut buf_split_result=String::new(); INPUT_BUFFER.with(|p| buf_split_result = p.borrow_mut().pop_front().unwrap()); let $x:$t = buf_split_result.parse().unwrap(); )* }; } #[macro_export] #[allow(unused_macros)] macro_rules! input_all { ( $($x:ident : $t:ty),*) => { $( INPUT_BUFFER.with(|p| if p.borrow().len()==0{ let mut temp_str = String::new(); std::io::stdin().read_to_string(&mut temp_str).unwrap(); let mut split_result_iter = temp_str.split_whitespace().map(|q|q.to_string()).collect::>(); p.borrow_mut().append(&mut split_result_iter) }); let mut buf_split_result=String::new(); INPUT_BUFFER.with(|p| buf_split_result = p.borrow_mut().pop_front().unwrap()); let ($x):($t) = buf_split_result.parse().unwrap(); )* }; } pub fn input_line_str() -> String { let mut s = String::new(); io::stdin().read_line(&mut s).unwrap(); s.trim().to_string() } #[allow(clippy::match_wild_err_arm)] pub fn input_vector() -> Vec where T: std::str::FromStr, { let mut v: Vec = Vec::new(); let s = input_line_str(); let split_result = s.split(SPLIT_DELIMITER); for z in split_result { let buf = match z.parse() { Ok(r) => r, Err(_) => panic!("Parse Error",), }; v.push(buf); } v } #[allow(clippy::match_wild_err_arm)] pub fn input_vector_row(n: usize) -> Vec where T: std::str::FromStr, { let mut v = Vec::with_capacity(n); for _ in 0..n { let buf = match input_line_str().parse() { Ok(r) => r, Err(_) => panic!("Parse Error",), }; v.push(buf); } v } pub trait ToCharVec { fn to_charvec(&self) -> Vec; } impl ToCharVec for String { fn to_charvec(&self) -> Vec { self.to_string().chars().collect::>() } } } use input::*;