[Rust]62和10进制转换

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   Compiling pe v0.1.0 (E:\code\pe)
    Finished dev [unoptimized + debuginfo] target(s) in 1.19s
     Running `target\debug\pe.exe`
1234
[src\main.rs:14] num2str(input_num(), map1) = "jU"
jU
[src\main.rs:15] str2num(input_str(), map2) = 1234

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use std::collections::HashMap;
fn main() {
    let all = vec![
        '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h',
        'i', 'j', 'k', 'l', 'm', 'n', 'o', 'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z',
        'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M', 'N', 'O', 'P', 'Q', 'R',
        'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z',
    ];

    let mut map1 = HashMap::new();
    let mut map2 = HashMap::new();
    for i in 0..62 {
        map1.insert(i, all[i]);
        map2.insert(all[i], i);
    }
    // dbg!(all.len());
    // dbg!(map1.get(&0));
    // dbg!(map2.get(&'k').unwrap());
    dbg!(num2str(input_num(), map1));
    dbg!(str2num(input_str(), map2));
    // dbg!(num2str(str2num(input_str(),map2),map1));
}
fn input_str() -> String {
    // 最多6位 max 6 char
    let mut input = String::new();
    std::io::stdin().read_line(&mut input).expect("Error input");
    input.trim().to_string()
}
fn input_num() -> usize {
    let mut input = String::new();
    std::io::stdin()
        .read_line(&mut input)
        .expect("Error num2str");
    input.trim().parse::<usize>().unwrap()
}
fn str2num(input: String, map2: HashMap<char, usize>) -> usize {
    let mut sum = 0;
    let mut len = input.len();
    for i in input.chars() {
        len -= 1;
        sum += map2.get(&i).unwrap() * ((62 as i32).pow(len as u32) as usize);
        // dbg!(len,sum);
    }
    sum
}
fn num2str(input: usize, map1: HashMap<usize, char>) -> String {
    let mut vec: Vec<char> = Vec::new();
    let mut input = input;
    loop {
        // dbg!(input);
        vec.push(*map1.get(&(input % 62)).unwrap());
        if input < 62 {
            break;
        }
        input = input / 62;
    }
    vec.reverse();
    vec.into_iter().collect()
}