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.lang.reflect.Array;
  import java.util.*;
  import java.io.*;
  
  public class A {
      public static void getAns(int[] ans, int idx, ArrayList<Integer> vals, ArrayList<Integer> al) {
          if (ans[idx] != -1) {
              return;
          }
          if (al.get(idx) == idx) {
              ans[idx] = vals.get(idx);
          } else {
              getAns(ans, al.get(idx), vals, al);
              ans[idx] = ans[al.get(idx)];
          }
      }
  
      public static void main(String[] args) throws IOException {
          Scanner sc = new Scanner(System.in);
          PrintWriter pw = new PrintWriter(System.out);
          int q = sc.nextInt();
          ArrayList<Integer> al = new ArrayList<>();
          ArrayList<Integer> vals = new ArrayList<>();
          int cur = 0;
          HashMap<Integer, Integer> par = new HashMap<>();
          while (q-- > 0) {
              int op = sc.nextInt();
              if (op == 1) {
                  int x = sc.nextInt();
                  al.add(cur);
                  vals.add(x);
                  if (par.containsKey(x)) {
                      int oldPar = par.get(x);
                      al.set(oldPar, cur);
                  }
                  par.put(x, cur);
                  cur++;
              } else {
                  int x = sc.nextInt();
                  int y = sc.nextInt();
                  if (!par.containsKey(x))
                      continue;
                  if (x == y)
                      continue;
                  if (par.containsKey(y)) {
                      al.set(par.get(x), par.get(y));
                      par.remove(x);
                  } else {
                      par.put(y, par.get(x));
                      vals.set(par.get(x), y);
                      par.remove(x);
                  }
              }
  //            pw.println(vals);
  //            pw.println(par);
  //            pw.println(al);
  //            pw.println("AAAAAAAAA");
          }
          int[] ans = new int[vals.size()];
          Arrays.fill(ans, -1);
          for (int i = 0; i < ans.length; i++) {
              getAns(ans, i, vals, al);
          }
          for (int x : ans) {
              pw.print(x + " ");
          }
          pw.println();
          pw.close();
      }
  
      static class Scanner {
          BufferedReader br;
          StringTokenizer st;
  
          public Scanner(InputStream s) {
              br = new BufferedReader(new InputStreamReader(s));
          }
  
          public Scanner(FileReader f) {
              br = new BufferedReader(f);
          }
  
          public String next() throws IOException {
              while (st == null || !st.hasMoreTokens())
                  st = new StringTokenizer(br.readLine());
              return st.nextToken();
          }
  
          public int nextInt() throws IOException {
              return Integer.parseInt(next());
          }
  
          public long nextLong() throws IOException {
              return Long.parseLong(next());
          }
  
          public double nextDouble() throws IOException {
              return Double.parseDouble(next());
          }
  
          public int[] nextIntArr(int n) throws IOException {
              int[] arr = new int[n];
              for (int i = 0; i < n; i++) {
                  arr[i] = Integer.parseInt(next());
              }
              return arr;
          }
      }
  }