/in/foo.cc: In function 'int main()':
/in/foo.cc:61:13: warning: format '%ld' expects argument of type 'long int', but argument 2 has type 'int' [-Wformat=]
   61 |   printf("%ld",f[n][m]);
      |           ~~^  ~~~~~~~
      |             |        |
      |             long int int
      |           %d