Compilare: user.cpp: In function ‘int main()’: user.cpp:40:44: warning: array subscript has type ‘char’ [-Wchar-subscripts] if(sir[4]<'a'||sir[4]>'z') C[sir[3]].push_back(sir[1]); ^ user.cpp:60:24: warning: array subscript has type ‘char’ [-Wchar-subscripts] for(it=C[sir[i]].begin();it!=C[sir[i]].end();it++) ^ user.cpp:60:46: warning: array subscript has type ‘char’ [-Wchar-subscripts] for(it=C[sir[i]].begin();it!=C[sir[i]].end();it++) ^ /tmp/ccxajPiA.o: In function `main': user.cpp:(.text.startup+0xdc): warning: the `gets' function is dangerous and should not be used.