Compilare: user.cpp: In function ‘std::vector<int> tap(int)’: user.cpp:12:36: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < graph[x].size(); ++i){ ^ user.cpp: In function ‘int main()’: user.cpp:46:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < add.size(); ++i) ^ user.cpp:50:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < ans.size(); ++i) ^