Compilare: user.cpp: In function ‘int main()’: user.cpp:60:72: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int count = 0; count < graph[current_node.first].size(); ++count) { ^ user.cpp:69:27: warning: ‘index’ may be used uninitialized in this function [-Wmaybe-uninitialized] visited[index] = 1; ^