Compilare: user.cpp: In function ‘int main()’: user.cpp:17:30: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf (fin,"%d%d",&n,&m); ^ user.cpp:19:45: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf (fin,"%d%d ",&v[i].x,&v[i].y); ^ user.cpp:53:13: warning: ‘sf’ may be used uninitialized in this function [-Wmaybe-uninitialized] if (f[i]>=sf && v[i].cul=='A') ^~