Compilare: user.cpp: In function ‘int main()’: user.cpp:114:11: warning: variable ‘frm’ set but not used [-Wunused-but-set-variable] int x,frm,dist; ^ user.cpp:100:23: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in,"%d",&n); ^ user.cpp:106:32: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in,"%d%d",&a,&b); ^