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
#include<algorithm>
#include<cstdio>
#include<iostream>
using namespace std;
int tab[1000003];

int main()
{
	ios_base::sync_with_stdio(0);
	int n, i;
	cin >> n;
	for(i = 0; i < n; i++) cin >> tab[i];
	sort(tab,tab + n);
	if(tab[0] == 1 && tab[1] == 1) {
		cout<< 0 << endl << 2 << endl << 1 <<" " << 2;		
	}
	if(tab[0] == 1 && tab[1] > 1) {
		cout<< 1 << endl << 2 << endl << 1 <<" " << 2;		
	}
	if(tab[0] > 1 && tab[1] > 1) {
		cout<< 2 << endl << 2 << endl << 1 <<" " << 2;		
	}
	

				
return 0;					
}