Compilare: main.cpp: In function 'int main()': main.cpp:21:27: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 21 | for(int i = 0 ; i < s2.size() ; i++){ | ~~^~~~~~~~~~~ main.cpp:22:24: warning: array subscript has type 'char' [-Wchar-subscripts] 22 | frec2[s2[i]]++; | ^ main.cpp:24:27: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 24 | for(int i = 0 ; i < s1.size() ; i++){ | ~~^~~~~~~~~~~ main.cpp:25:24: warning: array subscript has type 'char' [-Wchar-subscripts] 25 | frec1[s1[i]]++; | ^