Compilare: main.cpp: In function 'void solve()': main.cpp:45:27: warning: array subscript has type 'char' [-Wchar-subscripts] 45 | if(!f[r[j]]) | ^ main.cpp:46:27: warning: array subscript has type 'char' [-Wchar-subscripts] 46 | f[r[j]]=1,ans++; | ^ main.cpp:52:13: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 52 | if(j!=r.size()) | ~^~~~~~~~~~ main.cpp:54:23: warning: array subscript has type 'char' [-Wchar-subscripts] 54 | if(!f[r[j]]) | ^ main.cpp:55:23: warning: array subscript has type 'char' [-Wchar-subscripts] 55 | f[r[j]]=1,ans++; | ^