1
 2
 3
 4
 5
 6
 7
 8
 9
10
11
12
13
14
15
16
17
18
19
20
21
22
#include <bits/stdc++.h>
using namespace std;
int main(){
    cin.tie(0);
    cout.tie(0);
    ios_base::sync_with_stdio(0);
    int a,b=0;
    int n;
    cin >> n;
    for(int i=0;i<n;i++){
        cin >> a;
        if(a == 1){
            b++;
            if(b==2){
                cout << 0 << endl << 2 << endl << 1 << " " << 2 << endl;
                return 0;
            }
        }
    }
    cout << 2-b << endl << 2 << endl << 1 << " " << 2 << endl;
    return 0;
}