Compilare: user.cpp: In function ‘void dfs(int)’: user.cpp:52:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i=0; i<G[x].size(); i++) ^ user.cpp: In function ‘void dfst(int)’: user.cpp:61:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i=0; i<GT[x].size(); i++) ^ user.cpp: In function ‘void afisare()’: user.cpp:70:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (j=0; j<ctc[i].size(); j++) ^