Problem:
Set: Search

For a set $S$ of integers, perform a sequence of the following operations. Note that each value in $S$ must be unique.

insert($x$): Insert $x$ to $S$ and report the number of elements in $S$ after the operation.

find($x$): Report the number of $x$ in $S$ (0 or 1).

Input

The input is given in the following format.

$q$
$query_1$
$query_2$
:
$query_q$

Each query $query_i$ is given by

0 $x$

or

1 $x$

where the first digits 0 and 1 represent insert and find operations respectively.

Output

For each insert operation, print the number of elements in $S$.

For each find operation, print the number of specified elements in $S$.

Constraints

$1 \leq q \leq 200,000$

$0 \leq x \leq 1,000,000,000$

Sample Input 1

7
0 1
0 2
0 3
0 2
0 4
1 3
1 10

Sample Output 1

1
2
3
3
4
1
0

Solution in C++14 (judge verdict: Accepted)

#include <bits/stdc++.h>
using namespace std;

typedef long long ll;

int main() {
  set<int> st;
  int q; cin >> q;
  for(int i=0; i<q; i++){
    int query, x;
    cin >> query >> x;
    if(query==0){
      st.insert(x);
      cout << st.size() << endl;
    }
    else {
      auto itr = st.find(x);
      if(itr != st.end()) cout << 1 << endl;
      else cout << 0 << endl;
    }
  }
}