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
//Damian Denc
#include<bits/stdc++.h>

using namespace std;

int main()
{
    ios_base::sync_with_stdio(0);
    cin.tie(0);

    long long ile, xd=0, tmp;
    cin >> ile;
    for(long long i=0;i<ile;++i)
    {
        cin >> tmp;
        if(tmp==1)
            ++xd;
    }
    if(xd>=2)
        cout << 0 << "\n" << 2 << "\n" << 1 << " " << 2;
    else if(xd==1)
        cout << "1\n2\n1 2";
    else if(xd==0)
        cout << "2\n2\n1 2";
    return 0;
}