题解 | #密码验证合格程序#

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
public class Main {
    public static void main(String[] args) {
        BufferedReader r = new BufferedReader(new InputStreamReader(System.in));
        String a;
        char[] chs;
        int i, j, n1, n2, n3, n4;
        boolean repet1;
        try {
            while ((a = r.readLine()) != null && !a.isEmpty()) {
                chs = a.toCharArray();
                if (chs.length <= 8) {
                    System.out.println("NG");
                    continue;
                }
                i = 0;
                n1 = 0;
                n2 = 0;
                n3 = 0;
                n4 = 0;
                while (i < chs.length) {
                    if (((chs[i] - 'a') | ('z' - chs[i])) > 0) n1 = 1;
                    else if (((chs[i] - 'A') | ('Z' - chs[i])) > 0) n2 = 1;
                    else if (((chs[i] - '0') | ('9' - chs[i])) > 0) n3 = 1;
                    else n4 = 1;
                    i++;
                }
                if ((n1 + n2 + n3 + n4) < 3) {
                    System.out.println("NG");
                    continue;
                }
                i = 2;
                repet1 = false;
                while (i < chs.length - 1) {
                    j = i + 1;
                    while (j < chs.length) {
                        if (chs[i - 2] == chs[j - 2] && chs[i - 1] == chs[j - 1] && chs[i] == chs[j]) {
                            repet1 = true;
                            break;
                        }
                        j++;
                    }
                    if (repet1) break;
                    i++;
                }
                if (repet1) {
                    System.out.println("NG");
                    continue;
                }
                System.out.println("OK");
            }
        } catch (IOException e) {
            throw new RuntimeException(e);
        }
    }
}