Compilare: user.cpp: In function ‘void cer2()’: user.cpp:27:69: warning: operation on ‘n’ may be undefined [-Wsequence-point] while(n < k && INT_MAX > a[n] + a[n-1]) a[++n] = a[n-1] + a[n-2]; ^ user.cpp:27:69: warning: operation on ‘n’ may be undefined [-Wsequence-point] user.cpp:23:18: warning: unused variable ‘x’ [-Wunused-variable] long long i, x, z, y; ^ user.cpp:23:21: warning: unused variable ‘z’ [-Wunused-variable] long long i, x, z, y; ^ user.cpp:23:24: warning: unused variable ‘y’ [-Wunused-variable] long long i, x, z, y; ^