Compilare: user.cpp: In function ‘int BFS(int, int)’: user.cpp:63:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<LA[u].size(); ++i) { ^ user.cpp: In function ‘int flux(int, int)’: user.cpp:80:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<LA[D].size(); ++i) { ^ user.cpp: In function ‘void solve()’: user.cpp:120:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<sol.size(); ++i) cout << sol[i] << " "; ^