Compilare: user.cpp: In function ‘int main()’: user.cpp:14:22: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%d",&n); ^ user.cpp:17:32: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%d %d",&x,&y); ^ user.cpp:37:41: warning: ‘i1’ may be used uninitialized in this function [-Wmaybe-uninitialized] p=1;u=1;c[1]=i1;ok1[i1]=1;lev1[i1]=0; ^