Compilare: main.cpp: In function 'int bfs(int)': main.cpp:22:5: warning: 'if constexpr' only available with '-std=c++17' or '-std=gnu++17' 22 | if constexpr (second_pass) | ^~~~~~~~~ main.cpp:42:5: warning: 'if constexpr' only available with '-std=c++17' or '-std=gnu++17' 42 | if constexpr (second_pass) | ^~~~~~~~~ main.cpp: In function 'int bfs(int) [with bool second_pass = true]': main.cpp:43:16: warning: 'now' may be used uninitialized in this function [-Wmaybe-uninitialized] 43 | return depth[now]; | ^~~ main.cpp: In function 'int bfs(int) [with bool second_pass = false]': main.cpp:45:10: warning: 'now' may be used uninitialized in this function [-Wmaybe-uninitialized] 45 | return now; | ^~~