description: You have an array of integers (initially empty).
  
  You have to perform q queries. Each query is of one of two types: 
  
    * "1 x" — add the element x to the end of the array; 
    * "2 x y" — replace all occurrences of x in the array with y. 
  
  
  
  Find the resulting array after performing all the queries.
  
  Input
  
  The first line contains a single integer q (1 ≤ q ≤ 5 ⋅ 10^5) — the number of queries.
  
  Next q lines contain queries (one per line). Each query is of one of two types: 
  
    * "1 x" (1 ≤ x ≤ 5 ⋅ 10^5); 
    * "2 x y" (1 ≤ x, y ≤ 5 ⋅ 10^5). 
  
  
  
  It's guaranteed that there is at least one query of the first type.
  
  Output
  
  In a single line, print k integers — the resulting array after performing all the queries, where k is the number of queries of the first type.
  
  Examples
  
  Input
  
  
  7
  1 3
  1 1
  2 1 2
  1 2
  1 1
  1 2
  2 1 3
  
  
  Output
  
  
  3 2 2 3 2 
  
  Input
  
  
  4
  1 1
  1 2
  1 1
  2 2 2
  
  
  Output
  
  
  1 2 1 
  
  Input
  
  
  8
  2 1 4
  1 1
  1 4
  1 2
  2 2 4
  2 4 3
  1 2
  2 2 7
  
  
  Output
  
  
  1 3 3 7 
  
  Note
  
  In the first example, the array changes as follows:
  
  [] → [3] → [3, 1] → [3, 2] → [3, 2, 2] → [3, 2, 2, 1] → [3, 2, 2, 1, 2] → [3, 2, 2, 3, 2].
  
  In the second example, the array changes as follows:
  
  [] → [1] → [1, 2] → [1, 2, 1] → [1, 2, 1].
  
  In the third example, the array changes as follows:
  
  [] → [] → [1] → [1, 4] → [1, 4, 2] → [1, 4, 4] → [1, 3, 3] → [1, 3, 3, 2] → [1, 3, 3, 7].
solution: 
  import java.io.BufferedReader;
  import java.io.IOException;
  import java.io.InputStreamReader;
  import java.io.PrintWriter;
  import java.util.ArrayList;
  import java.util.List;
  import java.util.StringTokenizer;
  
  public class E {
      static class RealScanner {
          BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
          StringTokenizer st = new StringTokenizer("");
  
          String next() {
              while (!st.hasMoreTokens())
                  try {
                      st = new StringTokenizer(br.readLine());
                  } catch (IOException e) {
                      e.printStackTrace();
                  }
              return st.nextToken();
          }
  
          int nextInt() {
              return Integer.parseInt(next());
          }
  
          int[] readArray(int n) {
              int[] a = new int[n];
              for (int i = 0; i < n; i++) a[i] = nextInt();
              return a;
          }
  
          long nextLong() {
              return Long.parseLong(next());
          }
      }
  
      public static void main(String[] args) {
          PrintWriter out = new PrintWriter(System.out);
          RealScanner sc = new RealScanner();
          List<Integer> l = new ArrayList<>();
          int q = sc.nextInt();
          int id = 500000 + 1;
  //        List<Integer> idx = new ArrayList<>();
          int count = 0;
          int[] arr[] = new int[id][2];
          int[] st_arr = new int[id];
  //        int[] def_arr = new int[id];
          int[] res = new int[id];
          for (int i = 1; i < id; i++) {
              st_arr[i] = i;
          }
          for (int i = 0; i < q; i++) {
              int n = sc.nextInt();
              if (n == 1) {
                  int a = sc.nextInt();
                  arr[i][0] = -1;
                  arr[i][1] = a;
                  count++;
              } else {
                  int a, b;
                  a = sc.nextInt();
                  b = sc.nextInt();
                  arr[i][0] = a;
                  arr[i][1] = b;
              }
          }
          int val = count, temp;
          for (int i = q - 1; i >= 0; i--) {
              int x, y;
              x = arr[i][0];
              y = arr[i][1];
              if (arr[i][0] != -1) {
                  st_arr[x] = st_arr[y];
              } else {
                  temp = st_arr[y];
                  res[count] = temp;
                  count--;
              }
          }
          for (int i = 1; i <= val; i++) {
              out.print(res[i] + " ");
          }
          out.println();
          out.flush();
          out.close();
      }
  }
  