#include <cstdio> using namespace std; int n, a, count_one = 0; int main() { scanf("%d", &n); for (int i=0; i<n; ++i) { scanf("%d", &a); if (a==1) ++count_one; } if (count_one == 0) printf("2\n"); else if (count_one == 1) printf("1\n"); else printf("0\n"); printf("2\n"); printf("1 2\n"); }
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 | #include <cstdio> using namespace std; int n, a, count_one = 0; int main() { scanf("%d", &n); for (int i=0; i<n; ++i) { scanf("%d", &a); if (a==1) ++count_one; } if (count_one == 0) printf("2\n"); else if (count_one == 1) printf("1\n"); else printf("0\n"); printf("2\n"); printf("1 2\n"); } |