Compilare: user.cpp: In function ‘void DFS(int)’: user.cpp:34:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=0; i<A[k].size(); i++) ^ user.cpp: In function ‘void DFS_t(int)’: user.cpp:45:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=0; i<A_t[k].size(); i++) ^ user.cpp: In function ‘void afisare()’: user.cpp:56:37: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j=0; j<sol[i].size(); j++) ^