Algorithm_Practice/BAEKJOON_14395 at Master · mw7895la/Algorithm_Practice · GitHub

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import java.io.*;
import java.util.*;


public class Main {
    static long max = 1000000001L;
    public static void main(String[] args) throws IOException {
        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
        BufferedWriter bw = new BufferedWriter(new OutputStreamWriter(System.out));

        StringTokenizer st = new StringTokenizer(br.readLine());
        long s = Long.parseLong(st.nextToken());
        long t = Long.parseLong(st.nextToken());
        Queue<Long> q = new LinkedList<>();
        Queue<String> qs = new LinkedList<>();
        HashSet<Long> set = new HashSet<>();

        if(s==t){
            bw.write("0");
            bw.flush();
            bw.close();
            System.exit(0);
        }

        q.add(s);
        qs.add("");
        set.add(s);
        while (!q.isEmpty()) {

            long now = q.poll();
            String str = qs.poll();

            if(now == t){
                System.out.println(str);
                System.exit(0);
            }

            if (0 <= now * now && now * now < max && set.contains(now * now) == false) {
                set.add(now*now);
                q.add(now*now);
                qs.add(str+"*");
            }
            if (0 <= now + now && now + now < max && set.contains(now + now) == false) {
                set.add(now+now);
                q.add(now+now);
                qs.add(str+"+");
            }
            if (0 <= now - now && now - now < max && set.contains(now - now) == false) {
                set.add(now-now);
                q.add(now-now);
                qs.add(str+"-");
            }
            if (now!=0 && 0 <= now / now && now / now < max && set.contains(now / now) == false) {
                set.add(now/now);
                q.add(now/now);
                qs.add(str+"/");
            }


        }

        System.out.println(-1);
    }
}