1
 2
 3
 4
 5
 6
 7
 8
 9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
#include <iostream>

using namespace std;

int n,a,zm;

int main()
{
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    cin>>n;
    for (int i=0; i<n; i++)
    {
        cin>>a;
        if (a==1)
            ++zm;
    }
    if (zm>=2)
    {
        cout<<0<<"\n"<<2<<"\n";
        cout<<1<<" "<<2;
    }
    else if (zm==1)
    {
        cout<<1<<"\n"<<2<<"\n";
        cout<<1<<" "<<2;
    }
    else
    {
        cout<<2<<"\n"<<2<<"\n";
        cout<<1<<" "<<2;
    }
    return 0;
}