문제https://www.acmicpc.net/problem/12931풀이(18분)import java.io.*;import java.util.*;public class Main { public static void main(String[] args) throws IOException { BufferedReader br = new BufferedReader(new InputStreamReader(System.in)); StringTokenizer st; int n = Integer.parseInt(br.readLine()); int[] arr = new int[n]; boolean[] check = new boolean[n]; ..