Compilare: main.cpp: In function 'int main()': main.cpp:21:17: warning: variable 'ni' set but not used [-Wunused-but-set-variable] int i , n , ni , d , phi , j , cnt , q , a , b; ^~ main.cpp:53:25: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf (fin,"%d",&q); ^ main.cpp:56:34: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf (fin,"%d%d",&a,&b); ^