https://www.acmicpc.net/problem/2468 틀린 접근법 (69%)import java.io.*;import java.util.*;public class prac { public static int[][] arr; public static boolean[][] visited; public static int n; public static int[] dx = {0,1,0,-1}; public static int[] dy = {1,0,-1,0}; public static HashSet hs = new HashSet(); public static void main(String[] args) throws Exception { Buff..