Compilare: user.cpp: In function ‘void dfs(int)’: user.cpp:14:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<to[nod].size();i++) ^ user.cpp: In function ‘void conex(int)’: user.cpp:28:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<from[nod].size();i++) ^ user.cpp: In function ‘int main()’: user.cpp:70:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=0;j<ctc[i].size();j++) g<<ctc[i][j]<<' '; ^