이것저것 개발 블로그

https://www.acmicpc.net/problem/10807

풀이)

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

public class Main_BJ_10807_개수세기 {
    public static void main(String[] args) throws Exception{
        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
        int n = Integer.parseInt(br.readLine());
        HashMap<Integer, Integer> map = new HashMap<>();
        StringTokenizer st = new StringTokenizer(br.readLine());
        for(int i=0; i<n; i++){
            int key = Integer.parseInt(st.nextToken());
            map.put(key, map.getOrDefault(key, 0)+1);
        }
        int v = Integer.parseInt(br.readLine());
        System.out.println(map.getOrDefault(v, 0));
    }
}

hashmap에 넣어서 촥촥 뽑아내면 끝!!!

편리하다잉~~