Compilare: main.cpp: In function 'int getCode(std::__cxx11::string)': main.cpp:16:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < nr.length(); ++i) ~~^~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:29:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j = 0; j <= id.length(); ++j) ~~^~~~~~~~~~~~~~ main.cpp:54:9: warning: 'cod' may be used uninitialized in this function [-Wmaybe-uninitialized] if (getCode(v[i]) == cod) ^~ main.cpp:51:55: warning: 'k' may be used uninitialized in this function [-Wmaybe-uninitialized] cout << plutoane << "\n" << maxim << "\n" << k << "\n"; ^~~~