Compilare: user.cpp: In function ‘int main()’: user.cpp:26:31: warning: unused variable ‘cop’ [-Wunused-variable] int i,j,xx,yy,x,y,ps,pi,k,cop,ll; ^ user.cpp:28:10: warning: variable ‘ch’ set but not used [-Wunused-but-set-variable] char ch; ^ user.cpp:31:28: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%d %d",&m,&n); ^