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 | #include <iostream>
int main()
{
int n;
int* v;
int one_count = 0;
std::cin >> n;
v = new int[n];
for(int i=0;i<n;i++)
{
std::cin >> v[i];
if(v[i]==1)
one_count++;
}
if(one_count==0)
std::cout << "2\n2\n1 2";
else if(one_count==1)
std::cout << "1\n2\n1 2";
else
std::cout << "0\n2\n1 2";
return 0;
}
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