Compilare: main.cpp: In function 'MinimumSpanningTree minimum_spanning_tree(const Graph&)': main.cpp:44:32: warning: loop variable '<structured bindings>' creates a copy from type 'const std::pair<int, int>' [-Wrange-loop-construct] 44 | for (const auto[adj_cost, adj_node] : graph[node]) | ^~~~~~~~~~~~~~~~~~~~ main.cpp:44:32: note: use reference type to prevent copying 44 | for (const auto[adj_cost, adj_node] : graph[node]) | ^~~~~~~~~~~~~~~~~~~~ | & main.cpp: In function 'int main()': main.cpp:72:20: warning: loop variable '<structured bindings>' creates a copy from type 'const std::pair<int, int>' [-Wrange-loop-construct] 72 | for (const auto[node1, node2] : mst.edges) | ^~~~~~~~~~~~~~ main.cpp:72:20: note: use reference type to prevent copying 72 | for (const auto[node1, node2] : mst.edges) | ^~~~~~~~~~~~~~ | &