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  1. import java.io.*;
  2. import java.util.HashSet;
  3. import java.util.Set;
  4. import java.util.StringTokenizer;
  5.  
  6. /**
  7.  
  8. https://w...content-available-to-author-only...c.net/problem/11723
  9. 집합
  10. */
  11. public class Main {
  12.  
  13.     public static void main(String[] args) throws IOException {
  14.         BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
  15.         BufferedWriter bw = new BufferedWriter(new OutputStreamWriter(System.out));
  16.         int commandSize = Integer.parseInt(br.readLine());
  17.         Set<Integer> S = new HashSet<>();
  18.         Set<Integer> allS = new HashSet<>();
  19.         Set<Integer> emptyS = new HashSet<>();
  20.  
  21.         for(int i = 0; i < 20; i++) {
  22.             allS.add(i + 1);
  23.         }
  24.  
  25.         for(int i = 0; i < commandSize; i++) {
  26.             String read = br.readLine();
  27.             StringTokenizer st = new StringTokenizer(read);
  28.             String command = st.nextToken();
  29.  
  30.             if(command.equals("add")) {
  31.                 S.add(Integer.parseInt(st.nextToken()));
  32.  
  33.             } else if(command.equals("check")) {
  34.                 if(S.contains(Integer.parseInt(st.nextToken()))) {
  35.                     bw.write(1 + "\n");
  36.                 }else {
  37.                     bw.write(0 + "\n");
  38.                 }
  39.  
  40.             } else if(command.equals("toggle")) {
  41.                 int x = Integer.parseInt(st.nextToken());
  42.                 if(S.contains(x)) {
  43.                     S.remove(x);
  44.                 } else {
  45.                     S.add(x);
  46.                 }
  47.             } else if(command.equals("remove")) {
  48.                 S.remove(Integer.parseInt(st.nextToken()));
  49.  
  50.             } else if(command.equals("all")) {
  51.                 S = allS;
  52.  
  53.             } else if(command.equals("empty")) {
  54.                 S = emptyS;
  55.  
  56.             }
  57.         }
  58.  
  59.         br.close();
  60.         bw.flush();
  61.         bw.close();
  62.     }
  63. }
Success #stdin #stdout 0.09s 55000KB
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https://ideone.com/6c27gx
language:
Java (HotSpot 12)
created:
9 days ago
visibility:
public

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