Compilare: main.cpp: In function 'int subm(int)': main.cpp:31:1: warning: no return statement in function returning non-void [-Wreturn-type] 31 | } | ^ main.cpp: In function 'bool valid(int)': main.cpp:18:1: warning: control reaches end of non-void function [-Wreturn-type] 18 | } | ^ main.cpp: In function 'int subm(int)': main.cpp:19:5: warning: infinite recursion detected [-Winfinite-recursion] 19 | int subm(int k) | ^~~~ main.cpp:28:17: note: recursive call 28 | subm(k+1); | ~~~~^~~~~