Compilare: user.cpp: In function ‘bool bellman(int)’: user.cpp:40:36: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<v[nod].size(); ++i) ^ user.cpp: In function ‘int main()’: user.cpp:81:9: warning: unused variable ‘st’ [-Wunused-variable] int st = 0, dr = 10000000; ^ user.cpp:81:17: warning: unused variable ‘dr’ [-Wunused-variable] int st = 0, dr = 10000000; ^