foo.cc: In function ‘int main()’:
foo.cc:27:9: warning: format ‘%d’ expects argument of type ‘int*’, but argument 2 has type ‘short int*’ [-Wformat=]
   27 | scanf("%d",&a[i][j]);
      |        ~^  ~~~~~~~~
      |         |  |
      |         |  short int*
      |         int*
      |        %hd
foo.cc:23:7: warning: unused variable ‘k’ [-Wunused-variable]
   23 | int n,k;
      |       ^