Interview questions, not done

别叫我女生

public class Test1 {
    static int k = 0;
; static final String [] s = {"1", "2", "3", "4", "5"};
    public static void getOne (String ret, int pos) {
        if (pos> = 4) {
            System.out.println (ret);
           k = k + 1;
            return;
        }
        for (int i = 0; i <s.length; i ++) {
            ret + = s [i];
            getOne (ret, pos + 1);
            ret = ret.substring (0, pos-1);
        }
    }
    public static void main (String [] args) {
        String num = "";
        getOne (num, 1);
        System.out.println (k);
    }
}
If I only get 5th and 4th place, what should I do?

zzzdsd

if (ret.charAt (0) == '5') {System.out.println (ret);}

seakey

if (ret> = 10000) {System.out.println (ret);}

nuaa31203

for (int i = 0; i <s.length; i ++) {
        // Add a sentence
        if (i! = 3)
            ret + = s [i];
            getOne (ret, pos + 1);
            ret = ret.substring (0, pos-1);
        }

nuaa31203

Is it fourth?

别叫我女生

Yes, four people don't

别叫我女生

No. 4

别叫我女生

And if you can describe your thoughts, it would be the best, thank you

ly_1112

You describe the problem first ...

别叫我女生

Specify as a number, such as 1 2 3, I only need 3 digits which is 123 132 213 231 312 321
Give a few digits