Compilare: user.cpp: In function ‘void bk(int)’: user.cpp:56:15: warning: suggest explicit braces to avoid ambiguous ‘else’ [-Wparentheses] if(valid(k)) ^ user.cpp:69:15: warning: suggest explicit braces to avoid ambiguous ‘else’ [-Wparentheses] if(valid(k)) ^ user.cpp: In function ‘int solutie(int)’: user.cpp:30:1: warning: control reaches end of non-void function [-Wreturn-type] } ^ user.cpp: In function ‘int valid(int)’: user.cpp:48:1: warning: control reaches end of non-void function [-Wreturn-type] } ^