Compilare: user.cpp: In function ‘void eliminare(char)’: user.cpp:33:34: warning: array subscript has type ‘char’ [-Wchar-subscripts] while(!op.empty()&&p[op.top()]>=p[s]) ^ user.cpp:33:40: warning: array subscript has type ‘char’ [-Wchar-subscripts] while(!op.empty()&&p[op.top()]>=p[s]) ^ user.cpp: In function ‘void semn(int&)’: user.cpp:44:21: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(i<in.size()&&isalpha(in[i])) ^ user.cpp:66:24: warning: array subscript has type ‘char’ [-Wchar-subscripts] nr.push(p[in[i]]); ^ user.cpp:42:9: warning: unused variable ‘j’ [-Wunused-variable] int j; ^ user.cpp: In function ‘int main()’: user.cpp:81:12: warning: array subscript has type ‘char’ [-Wchar-subscripts] p[a]=!p[a]; ^ user.cpp:81:18: warning: array subscript has type ‘char’ [-Wchar-subscripts] p[a]=!p[a]; ^ user.cpp:82:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<in.size();i++) ^ user.cpp:85:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(i<in.size()&&isalpha(in[i])) ^