1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 | #include <bits/stdc++.h>
using namespace std;
int n;
int cnt;
int main(){
scanf("%d", &n);
for(int i = 1; i <= n; ++i){
int d;
scanf("%d", &d);
cnt += d == 1;
}
cnt = min(cnt, 2);
printf("%d\n", 2 - cnt);
puts("2");
puts("1 2");
return 0;
}
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