Compilare: main.cpp: In function 'int bellman_ford()': main.cpp:36:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=0; j<vecini[nod].size(); j++) ~^~~~~~~~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:137:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<afis.size(); i++) ~^~~~~~~~~~~~