Compilare: main.cpp: In function 'void solve()': main.cpp:18:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 18 | for(int i=0;i<s.size()-1;i++){ | ~^~~~~~~~~~~ main.cpp:28:25: warning: array subscript has type 'char' [-Wchar-subscripts] 28 | def[t[j]] = 1; | ^