Compilare: user.cpp: In function ‘int main()’: user.cpp:52:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<s.size();i++) ^ user.cpp:70:14: warning: array subscript has type ‘char’ [-Wchar-subscripts] lit[l]=1-lit[l]; ^ user.cpp:70:23: warning: array subscript has type ‘char’ [-Wchar-subscripts] lit[l]=1-lit[l]; ^ user.cpp:85:37: warning: array subscript has type ‘char’ [-Wchar-subscripts] S.push(lit[str[j][0]]); ^