Compilare: main.cpp: In member function 'void Hashtable::add(int)': main.cpp:18:27: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 18 | for (int i = 0; i < this->elems[key].size(); ++i) { | ~~^~~~~~~~~~~~~~~~~~~~~~~~~ main.cpp: In member function 'void Hashtable::remove(int)': main.cpp:28:27: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 28 | for (int i = 0; i < this->elems[key].size(); ++i) { | ~~^~~~~~~~~~~~~~~~~~~~~~~~~ main.cpp: In member function 'bool Hashtable::find(int)': main.cpp:39:27: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 39 | for (int i = 0; i < this->elems[key].size(); ++i) { | ~~^~~~~~~~~~~~~~~~~~~~~~~~~