import java.util.ArrayList; import java.util.Arrays; import java.util.Scanner; // 注意类名必须为 Main, 不要有任何 package xxx 信息 public class Main { public static void main(String[] args) { Scanner in = new Scanner(System.in); int n = in.nextInt(); int[][] sequence = new int[n][2]; for (int i = 0; i < n; i++...