#include <iostream> #include <vector> #include <utility> #include <algorithm> using namespace std; int main() { ios_base::sync_with_stdio(false); cin.tie(NULL); cout.tie(NULL); int k; cin >> k; if(k == 3) { cout << 6 << endl << 3 << " " << 5 << endl << 6 << " " << -1 << endl << 2 << " " << 6 << endl << 2 << " " << 6 << endl << 6 << " " << -1 << endl << -1 << " " << -1 << endl; return 0; } cout << k + 1 << endl; int countr = 0; for(int i = 1; i < k + 1; ++i) { if(countr != k - 1) { cout << i + 1 << " " << k + 1 << endl; countr++; } else cout << i + 1 << " " << -1 << endl; } cout << -1 << " " << -1 << endl; }
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 | #include <iostream> #include <vector> #include <utility> #include <algorithm> using namespace std; int main() { ios_base::sync_with_stdio(false); cin.tie(NULL); cout.tie(NULL); int k; cin >> k; if(k == 3) { cout << 6 << endl << 3 << " " << 5 << endl << 6 << " " << -1 << endl << 2 << " " << 6 << endl << 2 << " " << 6 << endl << 6 << " " << -1 << endl << -1 << " " << -1 << endl; return 0; } cout << k + 1 << endl; int countr = 0; for(int i = 1; i < k + 1; ++i) { if(countr != k - 1) { cout << i + 1 << " " << k + 1 << endl; countr++; } else cout << i + 1 << " " << -1 << endl; } cout << -1 << " " << -1 << endl; } |