Compilare: user.cpp: In function ‘void DFStf(int)’: user.cpp:27:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<a[x].size(); i++) ^ user.cpp: In function ‘void DFS(int)’: user.cpp:39:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<tr[x].size(); i++) ^ user.cpp: In function ‘void Afisare()’: user.cpp:68:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=0; j<ct[i].size(); j++) ^