use std::io::{self, Read}; #[derive(Debug)] struct Input { n: i32, } fn next_token(cin_lock: &mut io::StdinLock) -> String { cin_lock .by_ref() .bytes() .map(|c| c.unwrap() as char) .skip_while(|c| c.is_whitespace()) .take_while(|c| !c.is_whitespace()) .collect::() } fn read_input(cin_lock: &mut io::StdinLock) -> Input { Input { n: next_token(cin_lock).parse().unwrap(), } } fn fizzbuzz(n: i32) -> Option<&'static str> { let fizz = n % 3 == 0; let buzz = n % 5 == 0; if fizz && buzz { Some("FizzBuzz") } else if fizz { Some("Fizz") } else if buzz { Some("Buzz") } else { None } } fn solve(input: Input, _cin_lock: &mut io::StdinLock) { for n in 1..=input.n { match fizzbuzz(n) { Some(s) => println!("{}", s), None => println!("{}", n), } } } fn main() { let cin = io::stdin(); let mut cin_lock = cin.lock(); let input = read_input(&mut cin_lock); solve(input, &mut cin_lock); }