Compilare: user.cpp: In function ‘void ord(int)’: user.cpp:18:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i=0; i<vecin[x].size(); i++){ ^ user.cpp: In function ‘void dfs(int)’: user.cpp:29:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i=0; i<vec[x].size(); i++){ ^