Compilare: user.cpp: In function ‘void tarjan(int)’: user.cpp:34:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j=0;j<v[i].size();++j) ^ user.cpp: In function ‘int main(int, const char**)’: user.cpp:84:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i=0;i<liste.size();++i) ^ user.cpp:86:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (j=0;j<liste[i].size();++j) g<<liste[i][j]<<' '; ^