Compilare: user.cpp: In function ‘int main()’: user.cpp:55:19: warning: format ‘%ld’ expects argument of type ‘long int*’, but argument 2 has type ‘ll* {aka long long int*}’ [-Wformat=] scanf("%ld",&n); ^ user.cpp:57:9: warning: suggest parentheses around comparison in operand of ‘&’ [-Wparentheses] if(n&1 == 0) ^ user.cpp:53:10: warning: unused variable ‘j’ [-Wunused-variable] ll i,j,n; ^ user.cpp:64:12: warning: unused variable ‘c’ [-Wunused-variable] ll a,b,c,diva; ^ user.cpp:50:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("armonica.in","r",stdin); ^ user.cpp:51:39: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("armonica.out","w",stdout); ^ user.cpp:55:20: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%ld",&n); ^