Compilare: user.cpp: In member function ‘void Graph::ComputeMinimumSpanningTree()’: user.cpp:34:20: warning: unused variable ‘dx’ [-Wunused-variable] double dx=coada.top().first; ^~ user.cpp: In constructor ‘ProblemSolver::ProblemSolver(std::vector<std::pair<double, double> >&)’: user.cpp:99:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=1;i<=nodes.size();i++){ ~^~~~~~~~~~~~~~ user.cpp:100:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=i+1;j<=nodes.size();j++){ ~^~~~~~~~~~~~~~