Compilare: user.cpp: In function ‘int main()’: user.cpp:13:17: warning: unused variable ‘j’ [-Wunused-variable] int n,l,u,i,j,la,pr,q,x; ^ user.cpp:13:19: warning: unused variable ‘la’ [-Wunused-variable] int n,l,u,i,j,la,pr,q,x; ^ user.cpp:13:22: warning: unused variable ‘pr’ [-Wunused-variable] int n,l,u,i,j,la,pr,q,x; ^ user.cpp:13:25: warning: unused variable ‘q’ [-Wunused-variable] int n,l,u,i,j,la,pr,q,x; ^ user.cpp:13:27: warning: unused variable ‘x’ [-Wunused-variable] int n,l,u,i,j,la,pr,q,x; ^ user.cpp:15:22: warning: unused variable ‘s’ [-Wunused-variable] long long ans,md,s,t,le,ri; ^ user.cpp:15:24: warning: unused variable ‘t’ [-Wunused-variable] long long ans,md,s,t,le,ri; ^ user.cpp:11:34: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("secv3.in","r",stdin); ^ user.cpp:12:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("secv3.out","w",stdout); ^ user.cpp:75:23: warning: ‘ans’ may be used uninitialized in this function [-Wmaybe-uninitialized] cout<<(double)ans/100; ^