Compilare: user.cpp: In function ‘int fibonacci(long long int)’: user.cpp:3:13: warning: ‘fn’ may be used uninitialized in this function [-Wmaybe-uninitialized] #define mod 666013; ^~~~~~ user.cpp:12:17: note: ‘fn’ was declared here int f0, f1, fn; ^~ user.cpp: In function ‘int main()’: user.cpp:3:13: warning: ‘fn’ may be used uninitialized in this function [-Wmaybe-uninitialized] #define mod 666013; ^~~~~~ user.cpp:12:17: note: ‘fn’ was declared here int f0, f1, fn; ^~