Compilare: user.cpp: In member function ‘const sp sp::operator+(const sp&) const’: user.cpp:35:30: warning: division by zero [-Wdiv-by-zero] printf("%d\n",l2%0); ^ user.cpp: In function ‘int main()’: user.cpp:54:9: warning: unused variable ‘m’ [-Wunused-variable] int m,i,j,x,p; ^ user.cpp:55:15: warning: unused variable ‘ans’ [-Wunused-variable] long long ans=0; ^ user.cpp:52:34: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("indep.in","r",stdin); ^ user.cpp:53:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("indep.out","w",stdout); ^