Compilare: user.cpp: In function ‘int main()’: user.cpp:50:23: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%d%d",&n,&m); ^ user.cpp:53:28: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%d%d%d",&x,&y,&z); ^ user.cpp: In function ‘void belmann()’: user.cpp:34:42: warning: ‘nc’ may be used uninitialized in this function [-Wmaybe-uninitialized] if (use[nc]==0){u++;c[u]=nc;use[nc]=1;} ^