题解 | #密码验证合格程序#

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

fn main() {
    let stdin = io::stdin();
    unsafe {
        for line in stdin.lock().lines() {
            let ll = line.unwrap();
            let mut v: Vec<u8> = vec![0,0,0,0];
            if ll.len() < 8 {
                println!("NG");
                continue
            }
            for c in ll.trim().chars() {
                match c {
                    i if 'A' <= i && i <= 'Z' => v[0] += 1,
                    i if 'a' <= i && i <= 'z' => v[1] += 1,
                    i if '0' <= i && i <= '9' => v[2] += 1,
                    i if i == ' ' || i == '\n' => {},
                    _ => v[3] += 1
                }
            }
            for i in 0..v.len() { v[i] = if v[i] > 0 {1} else {0} }
            match (v[0] + v[1] + v[2] + v[3]) {
                i if i < 3 => {
                    println!("NG");
                    continue
                },
                _ => {},
            }
            if ll.len() <= 3 || (0..(ll.len() - 3)).all(|i| { ll.find(&ll[i..(i + 3)]) == ll.rfind(&ll[i..(i + 3)]) }) {
                println!("OK");
            } else {
                println!("NG");
            }
        }
    }
}