Compilare: user.cpp: In function ‘int main()’: user.cpp:76:8: warning: array subscript has type ‘char’ [-Wchar-subscripts] deg[a]+= 1; ^ user.cpp:77:6: warning: array subscript has type ‘char’ [-Wchar-subscripts] g[a].push_back(b); ^ user.cpp:78:7: warning: array subscript has type ‘char’ [-Wchar-subscripts] tg[b].push_back(a); } ^