/in/foo.cc: In function 'int main()':
/in/foo.cc:14:11: warning: array subscript is above array bounds [-Warray-bounds]
  F[0][0+MR]=0;
  ~~~~~~~~~^
/in/foo.cc:30:17: warning: array subscript is above array bounds [-Warray-bounds]
  cout<<F[n-1][MR];
                 ^