Compilare: user.cpp: In function ‘int main()’: user.cpp:52:11: warning: unused variable ‘x’ [-Wunused-variable] int i,x,y,ok=0; ^ user.cpp:52:13: warning: unused variable ‘y’ [-Wunused-variable] int i,x,y,ok=0; ^ user.cpp:53:28: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in,"%d%d",&n,&m); ^ user.cpp:56:42: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in,"%d%d",&v[i].x,&v[i].y); ^