Compilare: main.cpp: In function 'int main()': main.cpp:19:14: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 19 | for(i=0;i<n.size();i++) | ~^~~~~~~~~ main.cpp:50:13: warning: 'nr' may be used uninitialized in this function [-Wmaybe-uninitialized] 50 | m[s]+=nr;