1
 2
 3
 4
 5
 6
 7
 8
 9
10
11
12
13
14
15
16
17
//Patryk Kisielewski - pod.cpp - Poddrzewo [A]
#include <cstdio>

int main(){
    int i = 0, tmp, n, counter = 0;

    scanf("%d", &n);

    for(;i < n; ++i){
        scanf("%d", &tmp);
        if(tmp == 1) counter++;
    }

    printf("%d\n2\n1 2\n", 2-(counter<2?counter:2));

    return 0;
}