[백준/Java] 10816 숫자 카드 2

문제

https://www.acmicpc.net/problem/10816

풀이방법

애초에 저장하면서 등장 배열 횟수를 올림
M 카드 주어졌을 때 해당 값 말하기

풀이

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

public class Main {
    public static void main(String[] args) throws IOException {
        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
        int N = Integer.parseInt(br.readLine());
        HashMap<Integer, Integer> sCards = new HashMap<>();
        StringTokenizer st = new StringTokenizer(br.readLine());
        for (int i = 0; i<N; i++) {
            int num = Integer.parseInt(st.nextToken());
            sCards.put(num, sCards.getOrDefault(num, 0) + 1);
        }
        int M = Integer.parseInt(br.readLine());
        StringTokenizer st2 = new StringTokenizer(br.readLine());

        StringBuilder sb = new StringBuilder();

        for (int i = 0; i<M; i++) {
            int givenNum = Integer.parseInt(st2.nextToken());
            sb.append(sCards.getOrDefault(givenNum, 0)).append(" ");
        }
        System.out.println(sb);
    }
}