foo.cc: In function 'int main()':
foo.cc:26:27: warning: format '%d' expects argument of type 'int*', but argument 2 has type 'Node*' [-Wformat=]
   scanf("%d",&a[(i-1)*m+j]);
              ~~~~~~~~~~~~~^
foo.cc:21:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d %d",&n,&m);
  ~~~~~^~~~~~~~~~~~~~~
foo.cc:26:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   scanf("%d",&a[(i-1)*m+j]);
   ~~~~~^~~~~~~~~~~~~~~~~~~~
foo.cc:29:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d",&T);
  ~~~~~^~~~~~~~~
foo.cc:30:29: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  for(int i=1;i<=T;i++) scanf("%d",&t[i]);
                        ~~~~~^~~~~~~~~~~~

自豪的采用HydroJudge(https://github.com/hydro-dev/Hydro)进行评测。