1764번) 듣보잡

문제 출처 : https://www.acmicpc.net/problem/1764

import java.util.Collections; import java.util.HashSet; import java.util.LinkedList; import java.util.Scanner; public class Q1764 { public static void main(String[] args) { Scanner sc = new Scanner(System.in); int noListen = sc.nextInt(); int noSee = sc.nextInt(); HashSet<String> noListenList = new HashSet<String>(); for ( int i = 0; i < noListen; i++ ) { noListenList.add(sc.next()); } LinkedList<String> nono = new LinkedList<String>();  for ( int i = 0; i < noSee; i++ ) { String temp = sc.next(); if ( noListenList.contains(temp) ) { nono.add(temp); } } Collections.sort(nono); System.out.println(nono.size()); for ( int i = 0; i < nono.size(); i++ ) { System.out.println(nono.get(i)); } } }