Compilare: user.cpp: In function ‘int main()’: user.cpp:65:62: warning: format ‘%lld’ expects argument of type ‘long long int’, but argument 3 has type ‘int’ [-Wformat=] fprintf (out,"%lld\n",(p[1][1]*z+p[1][2]*y+p[1][3]*x)); ^ user.cpp:42:24: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf (in,"%d",&t); ^ user.cpp:48:58: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf (in,"%d%d%d%d%d%d%d",&x,&y,&z,&a,&b,&c,&n); ^