Compilare: user.cpp: In function ‘int main()’: user.cpp:34:13: warning: unused variable ‘j’ [-Wunused-variable] int n,i,j,sz; ^ user.cpp:35:22: warning: unused variable ‘imp’ [-Wunused-variable] long double l,vi,imp; ^ user.cpp:32:34: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("xmoto.in","r",stdin); ^ user.cpp:33:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("xmoto.out","w",stdout); ^