#include<bits/stdc++.h> using namespace std; int n,m,x; int main(){ for(scanf("%d",&n);n;--n)scanf("%d",&x),m+=x==1; printf("%d\n2\n1 2\n",max(2-m,0)); }
1 2 3 4 5 6 7 | #include<bits/stdc++.h> using namespace std; int n,m,x; int main(){ for(scanf("%d",&n);n;--n)scanf("%d",&x),m+=x==1; printf("%d\n2\n1 2\n",max(2-m,0)); } |