Compilare: user.cpp: In function ‘bool BFS()’: user.cpp:33:40: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(s != n) for(i=0;i<v[s].size();++i) if(!viz[v[s][i]] && F[s][v[s][i]] < C[s][v[s][i]]) ^ user.cpp: In function ‘int main()’: user.cpp:58:38: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(BFS()) for(i=0;i<v[n].size();++i) ^