Compilare: user.cpp: In function ‘void BFS(int, int)’: user.cpp:33:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<v1[nod].size();i++) ^ user.cpp: In function ‘int BellmanFord()’: user.cpp:59:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<v2[nod].size();i++) ^ user.cpp: In function ‘void Flux()’: user.cpp:75:8: warning: unused variable ‘i’ [-Wunused-variable] { int i,x,res,sol=0; ^ user.cpp: In function ‘int main()’: user.cpp:106:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<v1[city].size();i++) ^