Compilare: user.cpp: In function ‘void tarjan(int)’: user.cpp:25:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<G[nod].size();i++) ^ user.cpp: In function ‘int main()’: user.cpp:63:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<ctc.size();i++) ^ user.cpp:65:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=0;j<ctc[i].size();j++) g<<ctc[i][j]<<' '; ^