Compilare: user.cpp: In function ‘int main()’: user.cpp:21:60: warning: narrowing conversion of ‘(((x + 1) < m) ? ((int)a[(x + 1)].std::basic_string<_CharT, _Traits, _Alloc>::operator[]<char, std::char_traits<char>, std::allocator<char> >(((std::basic_string<char>::size_type)y))) : 123)’ from ‘int’ to ‘char’ inside { } [-Wnarrowing] ((y + 1 < n) ? a[x][y+1] : ('z' + 1))}; ^ user.cpp:21:60: warning: narrowing conversion of ‘(((y + 1) < n) ? ((int)a[x].std::basic_string<_CharT, _Traits, _Alloc>::operator[]<char, std::char_traits<char>, std::allocator<char> >(((std::basic_string<char>::size_type)(y + 1)))) : 123)’ from ‘int’ to ‘char’ inside { } [-Wnarrowing]