Compilare: user.cpp: In function ‘int main()’: user.cpp:28:27: warning: unused variable ‘nr’ [-Wunused-variable] int n,m,s,i,x,y,p,u,r,nr; ^ user.cpp:30:32: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%d%d%d",&n,&m,&s); ^ user.cpp:33:31: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%d%d",&x,&y); ^