1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 | #include <iostream>
using namespace std;
int main()
{
ios_base::sync_with_stdio(false); cin.tie(0); cout.tie(0);
uint32_t n;
cin >> n;
uint32_t o = 0;
for(uint32_t i = 0; i < n; i++)
if([]() { uint32_t d; cin >> d; return d; } () == 1) o++;
if(o >= 2)
cout << "0\n";
else if(o == 1)
cout << "1\n";
else
cout << "2\n";
cout << "2\n1 2";
}
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