Compilare: main.cpp: In function 'std::vector<int> build_numeros(std::map<int, std::vector<int> >)': main.cpp:14:21: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 14 | for (int i = 0; i < item.second.size(); i++) | ~~^~~~~~~~~~~~~~~~~~~~ main.cpp: In function 'std::map<int, std::vector<int> > build_freq(std::vector<int>)': main.cpp:28:20: 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 = 1; i < numeros.size(); i++) | ~~^~~~~~~~~~~~~~~~ main.cpp:35:8: warning: the address of 'pizdec' will never be NULL [-Waddress] 35 | if (&pizdec) | ^~~~~~~ main.cpp:52:7: warning: unused variable 'num' [-Wunused-variable] 52 | int num = item.first; | ^~~ main.cpp: In function 'int main()': main.cpp:81:24: warning: comparison of integer expressions of different signedness: 'std::vector<int>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare] 81 | while (numeros.size() != last_num_size) | ~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~