Compilare: user.cpp: In function ‘void dfs(int)’: user.cpp:23:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<V[v].size(); i++) ^ user.cpp: In function ‘void baga(std::vector<int>)’: user.cpp:35:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<V.size();i++) ^ user.cpp:41:37: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(V[i]==0&&i!=V.size()-1) ^ user.cpp:37:13: warning: unused variable ‘a’ [-Wunused-variable] int a=V[i]; ^ user.cpp: In function ‘int main()’: user.cpp:94:39: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=0; j<D.size(); j++) ^ user.cpp:112:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=0;j<R[i].size();j++) ^