蓝桥杯 第六届决赛 密文搜索 JAVA

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.HashSet;

class Main {
	static char c[];
	static String s1;
	static int count = 0;
	static HashSet set = new HashSet<>();
    public static void main(String[] args) throws IOException  {
    	BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
    	s1 = br.readLine();
    	int n = Integer.parseInt(br.readLine());
    	while(n-->0){
    	String s2 = br.readLine();
    	c = s2.toCharArray();
    	boolean b [] = new boolean [8];
    	char d[] = new char[8];
    	f(d,b,0);
    	count+=set.size();
    	set.clear();
    	}
    	System.out.println(count);
	}
	private static void f(char[] d, boolean[] b, int i) {
		if(i==8)
		{
			String s = new String (d);
			if(s1.contains(s))
				set.add(s);
			return;
		}
		HashSet set2 = new HashSet<>();
		for (int j = 0; j < b.length; j++) {
			if(!b[j] && set2.add(c[j])){
				b[j] = true;
				d[i] = c[j];
				f(d,b,i+1);
				b[j] = false;
			}
		}
		
	}
}