Compilare: main.cpp: In member function 'int element::get_best_node()': main.cpp:31:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<nodes.size(); i++) ~^~~~~~~~~~~~~ main.cpp: In function 'void dfs(int, std::vector<node>&)': main.cpp:83:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<graph[node_here].size(); i++) ~^~~~~~~~~~~~~~~~~~~~~~~~ main.cpp: In function 'void solve()': main.cpp:127:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<results.size(); i++) ~^~~~~~~~~~~~~~~