[백준] 32978 아 맞다 마늘 - Data Structure / Java

• 문제 링크

https://www.acmicpc.net/problem/32978

 

• 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;
import java.util.StringTokenizer;

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());
        StringTokenizer st = new StringTokenizer(br.readLine());
        for (int i = 0; i < n; i++) set.add(st.nextToken());

        st = new StringTokenizer(br.readLine());
        while (n-- > 1) set.remove(st.nextToken());

        bw.write(set.iterator().next());
        bw.flush();
    }

}