Compilare: user.cpp: In function ‘int main()’: user.cpp:109:11: warning: unused variable ‘frm’ [-Wunused-variable] int x,frm,dist; ^ user.cpp:95:23: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in,"%d",&n); ^ user.cpp:101:32: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in,"%d%d",&a,&b); ^