Compilare: user.cpp: In function ‘void bfs(int)’: user.cpp:61:38: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < N[nod].size (); i++) { ^ user.cpp: In function ‘int main()’: user.cpp:77:26: warning: array subscript has type ‘char’ [-Wchar-subscripts] v[i].c = frv[c[0]] + 5 * frv[c[1]] + 25 * frv[c[2]] + 125 * frv[c[3]]; ^ user.cpp:77:42: warning: array subscript has type ‘char’ [-Wchar-subscripts] v[i].c = frv[c[0]] + 5 * frv[c[1]] + 25 * frv[c[2]] + 125 * frv[c[3]]; ^ user.cpp:77:59: warning: array subscript has type ‘char’ [-Wchar-subscripts] v[i].c = frv[c[0]] + 5 * frv[c[1]] + 25 * frv[c[2]] + 125 * frv[c[3]]; ^ user.cpp:77:77: warning: array subscript has type ‘char’ [-Wchar-subscripts] v[i].c = frv[c[0]] + 5 * frv[c[1]] + 25 * frv[c[2]] + 125 * frv[c[3]]; ^