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 <bits/stdc++.h>
using namespace std;

int n, m = 0, a;

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

	cin >> n;

	for (int x = 0; x != n; x++) {
		cin >> a;
		if (a == 1) m++;
	}

	if (m > 1) {
		cout << "0\n" << "2\n" << "1 2\n";
		return 0;
	}
	if (m == 1) {
		cout << "1\n" << "2\n" << "1 2\n";
		return 0;
	}
	cout << "2\n" << "2\n" << "1 2\n";
	return 0;
}