Compilare: user.cpp: In function ‘int cb0(unsigned int, unsigned int)’: user.cpp:11:4: warning: suggest explicit braces to avoid ambiguous ‘else’ [-Wparentheses] if(st>dr) if(a[dr]==y) return dr; else return -1; ^ user.cpp:15:1: warning: control reaches end of non-void function [-Wreturn-type] } ^ user.cpp: In function ‘int cb1(unsigned int, unsigned int)’: user.cpp:23:1: warning: control reaches end of non-void function [-Wreturn-type] } ^ user.cpp: In function ‘int cb2(unsigned int, unsigned int)’: user.cpp:31:1: warning: control reaches end of non-void function [-Wreturn-type] } ^