Compilare: user.cpp: In function ‘long long int calc(int, int)’: user.cpp:19:16: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<graf[last].size();i++) //parcurg nodurile care arata spre ultimul nod din lant ~^~~~~~~~~~~~~~~~~~ user.cpp: In function ‘int main()’: user.cpp:48:11: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<graf[0].size();i++) ~^~~~~~~~~~~~~~~