[백준] 23544 Kinder Surprise - Data Structure / Java

• 문제 링크

https://www.acmicpc.net/problem/23544

 

• 풀이 코드

import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;
import java.util.HashSet;
import java.util.Set;

public class Main {

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

        Set<String> set = new HashSet<>();
        int n = Integer.parseInt(br.readLine());
        for (int i = 0; i < n; i++) set.add(br.readLine());

        bw.write(String.valueOf(n - set.size()));
        bw.flush();
    }

}