1
 2
 3
 4
 5
 6
 7
 8
 9
10
11
12
13
14
15
16
17
18
#include <iostream>

int main()
{
int n;
std::cin>>n;
int num1=0;
for(int i=0;i<n;++i)
{
int v;
std::cin>>v;
num1+=(v==1?1:0);
}
if(num1==0){std::cout<<"2\n2\n1 2";}
else if(num1==1){std::cout<<"1\n2\n1 2";}
else if(num1>=2){std::cout<<"0\n2\n1 2";}
return 0;
}