Compilare: user.cpp: In function ‘bool is_ok(int)’: user.cpp:36:40: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < vecini[nod].size(); ++i) ^ user.cpp: In function ‘void solve()’: user.cpp:56:40: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i<vecini[nod].size(); ++i){ ^ user.cpp:62:44: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j = 0; j<vecini[nod].size(); ++j) ^ user.cpp: In function ‘int main()’: user.cpp:77:40: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i<vecini[start].size();++i) ^