Compilare: main.cpp: In function 'int main()': main.cpp:20:26: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 20 | for(int i = 0; i < s2.size();i++) | ~~^~~~~~~~~~~ main.cpp:22:23: warning: array subscript has type 'char' [-Wchar-subscripts] 22 | if(total[s1[0]] != 0) | ^ main.cpp:23:25: warning: array subscript has type 'char' [-Wchar-subscripts] 23 | litere[s1[0]][0] = 1; | ^ main.cpp:24:26: 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 j = 1; j < s1.size(); j++) | ~~^~~~~~~~~~~