Compilare: user.cpp: In function ‘long long unsigned int fibo(long long unsigned int)’: user.cpp:120:23: warning: unused variable ‘pr’ [-Wunused-variable] ll t = x , k = 0 , pr , i , sp = 0 , r , sol = 0 , s , nn , cc; ^ user.cpp:120:41: warning: unused variable ‘r’ [-Wunused-variable] ll t = x , k = 0 , pr , i , sp = 0 , r , sol = 0 , s , nn , cc; ^ user.cpp: In function ‘void Read()’: user.cpp:192:20: warning: unused variable ‘ax’ [-Wunused-variable] ll i , a , b , ax , bx , ans1 , ans2; ^ user.cpp:192:25: warning: unused variable ‘bx’ [-Wunused-variable] ll i , a , b , ax , bx , ans1 , ans2; ^ user.cpp: In function ‘int main()’: user.cpp:208:8: warning: unused variable ‘i’ [-Wunused-variable] ll i; ^ user.cpp: In function ‘void Read()’: user.cpp:193:26: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf ( "%llu" , &n ); ^ user.cpp:196:43: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf ( "%llu%llu" , &a , &b ); ^ user.cpp: In function ‘int main()’: user.cpp:210:33: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen ( IN , "r" , stdin ); ^ user.cpp:211:35: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen ( OUT , "w" , stdout );// to be continued ^ user.cpp: In function ‘long long unsigned int fibo(long long unsigned int)’: user.cpp:129:17: warning: ‘j’ may be used uninitialized in this function [-Wmaybe-uninitialized] if ( F[j] == sp ) ^