Compilare: user.cpp: In function ‘void AddEdges(int, int, std::vector<Edge>::iterator, std::vector<Edge>::iterator, bool)’: user.cpp:52:46: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = edgePointer; i < edges.size(); i++) { ^ user.cpp: In function ‘std::pair<int, int> ContractVertices(int, int)’: user.cpp:72:46: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = edgePointer; i < edges.size(); i++) ^ user.cpp: In function ‘int main()’: user.cpp:160:37: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 1; i < answer.size(); i++) ^