Compilare: user.cpp: In function ‘long long int solve(int)’: user.cpp:6:9: warning: unused variable ‘p2’ [-Wunused-variable] int p2=1,rid=0; ^ user.cpp:6:14: warning: unused variable ‘rid’ [-Wunused-variable] int p2=1,rid=0; ^ user.cpp: In function ‘int main()’: user.cpp:18:34: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("zero2.in","r",stdin); ^ user.cpp:19:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("zero2.out","w",stdout); ^ user.cpp:21:28: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d",&n,&b); ^