hellozw：裁员还没结束，你们有通知啥实习的事吗

牛客557200294号：public class Main { public static void main(String[] args) { Scanner scanner = new Scanner(System.in); Set<Integer> set = new HashSet<>(); while (scanner.hasNextLine()) { String s = scanner.nextLine(); String[] s1 = s.split(" "); Integer a = Integer.valueOf(s1[0]); Integer b = Integer.valueOf(s1[1]); for (int i = a+1; i <= b; i++) { set.add(i); } } System.out.println(set.size()); } }