#include <iostream> using namespace std; typedef long long ll; const ll my_m = 1e9 + 7; const int rozmiar = 3e3 + 7; ll tab[rozmiar][2]; int main() { ios_base::sync_with_stdio(false); cin.tie(NULL); cout.tie(NULL); ll n, m; cin >> n >> m; // drzewa , gatunki tab[1][0] = m; tab[1][1] = 0; for (int i = 2; i <= n; i++) { tab[i][0] = ((tab[i - 1][0] * m) % my_m + tab[i - 1][1])%my_m; tab[i][1] = (tab[i - 1][0]) % my_m; } /*cout << tab[1][0] << "\n"; cout << tab[2][0] << "\n"; cout << tab[3][0] << "\n"; cout << tab[4][0] << "\n"; cout << "T:\n"; cout << tab[1][1] << "\n"; cout << tab[2][1] << "\n"; cout << tab[3][1] << "\n"; cout << tab[4][1] << "\n";*/ cout << tab[n][1] << "\n"; return 0; }
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 44 45 | #include <iostream> using namespace std; typedef long long ll; const ll my_m = 1e9 + 7; const int rozmiar = 3e3 + 7; ll tab[rozmiar][2]; int main() { ios_base::sync_with_stdio(false); cin.tie(NULL); cout.tie(NULL); ll n, m; cin >> n >> m; // drzewa , gatunki tab[1][0] = m; tab[1][1] = 0; for (int i = 2; i <= n; i++) { tab[i][0] = ((tab[i - 1][0] * m) % my_m + tab[i - 1][1])%my_m; tab[i][1] = (tab[i - 1][0]) % my_m; } /*cout << tab[1][0] << "\n"; cout << tab[2][0] << "\n"; cout << tab[3][0] << "\n"; cout << tab[4][0] << "\n"; cout << "T:\n"; cout << tab[1][1] << "\n"; cout << tab[2][1] << "\n"; cout << tab[3][1] << "\n"; cout << tab[4][1] << "\n";*/ cout << tab[n][1] << "\n"; return 0; } |