Compilare: user.cpp: In function ‘void dfs(int)’: user.cpp:11:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=0; i<V[q].size(); i++){ ~^~~~~~~~~~~~ user.cpp: In function ‘void dfsinv(int)’: user.cpp:19:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=0; i<Inv[q].size(); i++){ ~^~~~~~~~~~~~~~ user.cpp: In function ‘int main()’: user.cpp:43:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j=0; j<Sol[i].size(); j++) cout<<Sol[i][j]<<" "; ~^~~~~~~~~~~~~~