Compilare: user.cpp: In function ‘void tarjan(int)’: user.cpp:20:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<Lista[nc].size();i++){ ^ user.cpp: In function ‘int main()’: user.cpp:56:37: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=0;j<nrctc[i].size();j++) ^