Compilare: main.cpp: In constructor 'data::data(int, int, std::vector<std::vector<int> >&&)': main.cpp:16:35: warning: 'data::values' will be initialized after [-Wreorder] 16 | std::vector<std::vector<int>> values; | ^~~~~~ main.cpp:14:9: warning: 'int data::friends_number' [-Wreorder] 14 | int friends_number = 0; | ^~~~~~~~~~~~~~ main.cpp:11:5: warning: when initialized here [-Wreorder] 11 | data(int a, int b, std::vector<std::vector<int>>&& values) | ^~~~ main.cpp: In function 'bool checkValues(const std::vector<int>&, int, int)': main.cpp:21:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 21 | for (int i = 0; i < arr.size(); ++i) { | ~~^~~~~~~~~~~~