use std::io::*; use std::str::FromStr; //use std::num; //use std::cmp; fn main() { let mut count = 0; for _i in 1..=12{ for _j in 1..=30{ if _i == _j / 10 + _j % 10{ count += 1; } } } println!("{}",count); } pub fn read_line() -> String { let mut s: String = String::new(); std::io::stdin().read_line(&mut s).ok(); s } pub fn read() -> T { let stdin = stdin(); let stdin = stdin.lock(); let token: String = stdin .bytes() .map(|c| c.expect("failed to read char") as char) .skip_while(|c| c.is_whitespace()) .take_while(|c| !c.is_whitespace()) .collect(); token.parse().ok().expect("failed to parse token") } pub fn read_array() -> Vec { let array: String = read(); let chars: Vec = array.trim().chars().collect::>(); chars } pub fn get_data() -> Vec { let mut s: String = String::new(); std::io::stdin().read_line(&mut s).ok(); let vec: Vec = s .trim() .split_whitespace() .map(|e| e.parse().ok().unwrap()) .collect(); vec } pub fn get_chars() -> Vec { let mut s: String = String::new(); std::io::stdin().read_line(&mut s).ok(); let vec: Vec = s.trim().chars().collect::>(); vec }