#include <iostream> #include <vector> using namespace std; int main() { ios_base::sync_with_stdio(0); int n; cin >> n; int ones = 0, a; for (int i = 0; i < n; i++) { cin >> a; if (a == 1) ones++; } cout << 2 - min(ones, 2) << endl; cout << "2\n1 2\n"; return 0; }
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 | #include <iostream> #include <vector> using namespace std; int main() { ios_base::sync_with_stdio(0); int n; cin >> n; int ones = 0, a; for (int i = 0; i < n; i++) { cin >> a; if (a == 1) ones++; } cout << 2 - min(ones, 2) << endl; cout << "2\n1 2\n"; return 0; } |