foo.cc: In function 'int main()':
foo.cc:25:9: warning: format '%d' expects argument of type 'int*', but argument 2 has type 'short int*' [-Wformat=]
   25 | scanf("%d",&a[i][j]);
      |        ~^  ~~~~~~~~
      |         |  |
      |         |  short int*
      |         int*
      |        %hd
foo.cc:21:7: warning: unused variable 'k' [-Wunused-variable]
   21 | int n,k;
      |       ^
foo.cc:25:6: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   25 | scanf("%d",&a[i][j]);
      | ~~~~~^~~~~~~~~~~~~~~

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