Compilare: user.cpp: In function ‘int main()’: user.cpp:36:9: warning: unused variable ‘m’ [-Wunused-variable] int m,i,j; ^ user.cpp:37:15: warning: unused variable ‘ans’ [-Wunused-variable] long long ans=0; ^ user.cpp:34:34: 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:35:36: 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); ^