[백준] 22233 가희와 키워드 - HashSet(해시셋) JAVA

https://www.acmicpc.net/problem/22233

코드설명

 HashSet(해시셋) 을 활용합니다.

 

가희가 블로그에 작성한 키워드들을 메모장에서 하나씩 지워나가면 됩니다.

코드

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

public class Main {
	private static int C, N, M, W, H, K;
    private static int answer = 0;
    private static String[] arr;
    private static StringBuilder sb = new StringBuilder();
    public static void main(String[] args) throws IOException {
        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
        StringTokenizer st = new StringTokenizer(br.readLine());
        
        N = Integer.parseInt(st.nextToken());
        M = Integer.parseInt(st.nextToken());
        
        arr = new String[N];
        HashSet<String> hashset = new HashSet<>();
        for(int i=0;i<N;i++) {
        	st = new StringTokenizer(br.readLine());
        	arr[i] = st.nextToken();
        	hashset.add(arr[i]);
        }
        
        for(int i=0;i<M;i++) {
        	st = new StringTokenizer(br.readLine());
        	answer = func(hashset, st.nextToken().split("[,]"));
        	sb.append(answer).append("\n");
//        	System.out.println(answer);
        }
        System.out.println(sb.toString());
        
        
    }
    private static int func(HashSet<String> hashset, String[] keyword) {
    	for(int i=0;i<keyword.length;i++) {
    		hashset.remove(keyword[i]);
    	}
    	return hashset.size();
    }
    
}