foo.cc: In function 'int main()':
foo.cc:36:35: warning: format '%d' expects argument of type 'int', but argument 2 has type 'long long int' [-Wformat=]
  printf("%d\n%d\n",f[0][0],f[0][1]);
                    ~~~~~~~        ^
foo.cc:36:35: warning: format '%d' expects argument of type 'int', but argument 3 has type 'long long int' [-Wformat=]
foo.cc:20:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d%d",&n,&m);
  ~~~~~^~~~~~~~~~~~~~
foo.cc:21:29: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  for(int i=1;i<=n;i++) scanf("%d",&a[i]);
                        ~~~~~^~~~~~~~~~~~

[Hydro](https://hydro.ac)提供评测服务