Compilare: user.cpp: In function ‘void divide_et_impera2(int, int, int, int, int, int, int)’: user.cpp:22:9: warning: unused variable ‘middle’ [-Wunused-variable] int middle=(left+right)/2; ^ user.cpp: In function ‘int main()’: user.cpp:39:34: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("banda.in","r",stdin); ^ user.cpp:40:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("banda.out","w",stdout); ^ user.cpp:42:36: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d%d%d",&n,&k,&cer,&x); ^