Compilare: main.cpp: In function 'int bfs()': main.cpp:16:9: warning: unused variable 'elem_first' [-Wunused-variable] 16 | int elem_first, elem_second; | ^~~~~~~~~~ main.cpp:16:21: warning: unused variable 'elem_second' [-Wunused-variable] 16 | int elem_first, elem_second; | ^~~~~~~~~~~ main.cpp:37:1: warning: control reaches end of non-void function [-Wreturn-type] 37 | } | ^