Compilare: main.cpp: In function 'int bfs(int)': main.cpp:19:5: warning: 'if constexpr' only available with '-std=c++17' or '-std=gnu++17' 19 | if constexpr (second_pass) { | ^~~~~~~~~ main.cpp:39:5: warning: 'if constexpr' only available with '-std=c++17' or '-std=gnu++17' 39 | if constexpr (second_pass) | ^~~~~~~~~ main.cpp: In function 'int bfs(int) [with bool second_pass = false]': main.cpp:42:10: warning: 'now' may be used uninitialized in this function [-Wmaybe-uninitialized] 42 | return now; | ^~~