Compilare: user.cpp: In function ‘void dfs(int)’: user.cpp:25:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<V[x].size();i++) ^ user.cpp: In function ‘void dfsT(int, int)’: user.cpp:33:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<Vt[x].size();i++) ^ user.cpp: In function ‘void write()’: user.cpp:54:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=0;j<V1[i].size();j++) ^