[BOJ] 9375 패션왕 신해빈 (JAVA)

https://www.acmicpc.net/problem/9375

9375번: 패션왕 신해빈

import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.util.HashMap;
import java.util.HashSet;
import java.util.StringTokenizer;

public class Main {
	
    public static void main(String[] args) throws Exception {

        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
        StringBuilder sb = new StringBuilder();
        int T = Integer.parseInt(br.readLine());
        for (int t = 0; t < T; t++) {
            int N = Integer.parseInt(br.readLine());
            HashMap<String, Integer> map = new HashMap<>();
            for (int i = 0; i < N; i++) {
                StringTokenizer st = new StringTokenizer(br.readLine(), " ");
                st.nextToken();
                String s = st.nextToken();
                map.put(s, map.getOrDefault(s, 0) + 1);
            }

            int cnt = 1;
            for (Integer value : map.values()) {
                cnt *= value + 1;
            }
            sb.append(cnt - 1).append("\n");
        }

        System.out.print(sb);

    }
	
}