Compilare: user.cpp: In function ‘int main()’: user.cpp:29:11: warning: unused variable ‘ct’ [-Wunused-variable] int n,ct,nr,i,j; ^~ user.cpp:29:14: warning: unused variable ‘nr’ [-Wunused-variable] int n,ct,nr,i,j; ^~ user.cpp:29:17: warning: unused variable ‘i’ [-Wunused-variable] int n,ct,nr,i,j; ^ user.cpp:29:19: warning: unused variable ‘j’ [-Wunused-variable] int n,ct,nr,i,j; ^ user.cpp:31:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("galeti2.in","r",stdin); ^ user.cpp:32:38: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("galeti2.out","w",stdout); ^ user.cpp:33:26: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%lld",&n,&e); ^