题解 | #进制转换#

use std::io::{self, *};

fn main() {
    let stdin = io::stdin();
    for line in stdin.lock().lines() {
        println!("{}", line.unwrap().chars().fold(0, |acc, x| {
            16 * acc + match x {
                '0' => 0,
                '1' => 1,
                '2' => 2,
                '3' => 3,
                '4' => 4,
                '5' => 5,
                '6' => 6,
                '7' => 7,
                '8' => 8,
                '9' => 9,
                'A' => 10,
                'B' => 11,
                'C' => 12,
                'D' => 13,
                'E' => 14,
                'F' => 15,
                _ => 0,
            }
        }));
    }
}