Compilare: main.cpp: In function 'void solve(std::string, std::string)': main.cpp:26:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 26 | for (int i = 0; i < s.length(); i++) | ~~^~~~~~~~~~~~ main.cpp:28:24: warning: array subscript has type 'char' [-Wchar-subscripts] 28 | characters[s[i]]++; | ^ main.cpp:31:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 31 | for (int i = 0; i < t.length(); i++) | ~~^~~~~~~~~~~~ main.cpp:33:24: warning: array subscript has type 'char' [-Wchar-subscripts] 33 | characters[t[i]]--; | ^ main.cpp:20:9: warning: unused variable 'countS' [-Wunused-variable] 20 | int countS = 0; | ^~~~~~ main.cpp:21:9: warning: unused variable 'countT' [-Wunused-variable] 21 | int countT = 0; | ^~~~~~