Compilare: main.cpp: In function 'int main()': main.cpp:30:24: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 30 | for (int i=0;i<s1.size() ; i++) | ~^~~~~~~~~~ main.cpp:32:24: warning: array subscript has type 'char' [-Wchar-subscripts] 32 | freq1[s1[i]]++; | ^ main.cpp:33:24: warning: array subscript has type 'char' [-Wchar-subscripts] 33 | freq2[s2[i]]++; | ^