Compilare: main.cpp: In member function 'std::pair<int, int> graph::find_min_node(std::vector<int>)': main.cpp:193:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<nodes_to_search.size();i++){ ~^~~~~~~~~~~~~~~~~~~~~~~ main.cpp: In member function 'bool graph::check_if_any_unmarked(std::vector<bool>)': main.cpp:231:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<arr.size();i++) ~^~~~~~~~~~~ main.cpp: In member function 'void graph::topSort(std::ofstream&)': main.cpp:278:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=0;j<sorted_nodes.size();j++) ~^~~~~~~~~~~~~~~~~~~~ main.cpp:255:13: warning: variable 'x' set but not used [-Wunused-but-set-variable] int x=-1; ^