题解 | #字符串加解密#

工作技能可以写熟悉ascii码的背诵么？（笑）

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

fn encry(s:Vec<u8>) -> String {
    let mut st = String::new();
    for i in s {
        let c = match i {
            48..=56 => i+1,//0 8 -> 1 9
            57 => 48,// 9 -> 0
            65..=89 => i + 33,//A Y -> b z
            90 => 97,//Z -> a
            97..=121 => i - 31,//a y -> B Z
            122 => 65,//z -> A
            _ => i,
        };
        st.push(char::from(c));
    }
    st
}

fn decry(s:Vec<u8>) -> String {
    let mut st = String::new();
    for i in s {
        let c = match i {
            48 => 57,//0 => 9
            49..=57 => i-1,//1 9 -> 0 8
            65 => 122,//A -> z
            66..=90 => i + 31,//B Z -> a y
            97 => 90,//a -> Z
            98..=122 => i - 33,//b z -> A
            _ => i,
        };
        st.push(char::from(c));
    }
    st
}

fn main() {
    let stdin = io::stdin();
    let mut is_first = true;
    for line in stdin.lock().lines() {
        let ll = line.unwrap();
        let s: Vec<u8> = Vec::from(ll);
        if is_first {
            println!("{}",encry(s));
            is_first = false;
        }else{
            println!("{}",decry(s));
            is_first = true;
        }
    }
}