use std::io::Read; fn get_word() -> String { let stdin = std::io::stdin(); let mut stdin=stdin.lock(); let mut u8b: [u8; 1] = [0]; loop { let mut buf: Vec = Vec::with_capacity(16); loop { let res = stdin.read(&mut u8b); if res.unwrap_or(0) == 0 || u8b[0] <= b' ' { break; } else { buf.push(u8b[0]); } } if buf.len() >= 1 { let ret = String::from_utf8(buf).unwrap(); return ret; } } } #[allow(dead_code)] fn get() -> T { get_word().parse().ok().unwrap() } fn main() { let n: usize = get(); let k: usize = get(); if k == 1 || k == n - 1 { println!("No"); return; } if k >= 3 { println!("Yes"); println!("1 2 -{}", 2 * k - 1); for i in 1..k - 1 { println!("{} {} 2", i + 1, i + 2); } for i in k + 1..n + 1 { println!("{} {} 2", k, i); } return; } if n % 2 != 0 { println!("No"); return; } println!("Yes"); for i in 0..n - 1 { println!("{} {} {}", i + 1, i + 2, if i % 2 == 0 { 1_000_000 } else { -1_000_001 }); } }