Compilare: main.cpp: In function 'std::optional<int> dist(int, int)': main.cpp:27:33: warning: loop variable '<structured bindings>' creates a copy from type 'const std::pair<int, int>' [-Wrange-loop-construct] 27 | for (const auto [vecin, d] : graf[sat]) { | ^~~~~~~~~~ main.cpp:27:33: note: use reference type to prevent copying 27 | for (const auto [vecin, d] : graf[sat]) { | ^~~~~~~~~~ | & main.cpp:33:33: warning: loop variable '<structured bindings>' creates a copy from type 'const std::pair<int, int>' [-Wrange-loop-construct] 33 | for (const auto [vecin, d] : grafInvers[sat]) { | ^~~~~~~~~~ main.cpp:33:33: note: use reference type to prevent copying 33 | for (const auto [vecin, d] : grafInvers[sat]) { | ^~~~~~~~~~ | &