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
#include <iostream>
using namespace std;
 //Compiler version g++ 6.3.0

 int main()
 {
 	int n, k, l;
 	l=0;
 	cin >> n;
 	while(n){
 		cin >> k;
 		if(k==1){
 			l++;
 		}
 		n--;
 	}
 	if(l>1){
 		cout << "0" << endl << "2" << endl << "1 2";
 	}
 	if(l==1){
 		cout << "1" << endl << "2" << endl << "1 2";
 	}
 	if(l==0){
 		cout << "2" << endl << "2" << endl << "1 2";
 	}
 }