Compilare: user.cpp: In function ‘int main()’: user.cpp:60:6: warning: unused variable ‘a’ [-Wunused-variable] int a,b; ^ user.cpp:60:8: warning: unused variable ‘b’ [-Wunused-variable] int a,b; ^ user.cpp:58:29: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in,"%d%d",&nod,&muc); ^ user.cpp:64:36: 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); ^