Compilare: main.cpp: In function 'long long int variation(int, int)': main.cpp:12:22: warning: comparison of integer expressions of different signedness: 'std::vector<long long int>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare] 12 | while(var.size() <= n) var.push_back(var[var.size() - 1] * var.size() % mod); | ~~~~~~~~~~~^~~~