Compilare: user.cpp: In function ‘void ComputeLine(char*)’: user.cpp:31:35: warning: array subscript has type ‘char’ [-Wchar-subscripts] last[ lastchar[nrcuv] ].push_back( nrcuv ); ^ user.cpp: In function ‘void print(short int)’: user.cpp:54:28: warning: passing NULL to non-pointer argument 1 of ‘void std::vector<_Tp, _Alloc>::push_back(std::vector<_Tp, _Alloc>::value_type&&) [with _Tp = char; _Alloc = std::allocator<char>; std::vector<_Tp, _Alloc>::value_type = char]’ [-Wconversion-null] cuv[i].push_back( NULL ); ^ user.cpp: In function ‘int main()’: user.cpp:85:34: warning: array subscript has type ‘char’ [-Wchar-subscripts] best[i] = best[ maxlast[c] ] + 1; ^ user.cpp:86:27: warning: array subscript has type ‘char’ [-Wchar-subscripts] poz[i] = maxlast[c]; ^ user.cpp:88:51: warning: array subscript has type ‘char’ [-Wchar-subscripts] if ( best[i] > best[ maxlast[ lastchar[i] ] ] ) ^ user.cpp:90:34: warning: array subscript has type ‘char’ [-Wchar-subscripts] maxlast[ lastchar[i] ] = i; ^