foo.cc:1: warning: ignoring #pragma warning  [-Wunknown-pragmas]
    1 | #pragma warning(disable:4996)
      | 
foo.cc: In function 'int main()':
foo.cc:31:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   31 |     scanf("%d %d", &n, &m);
      |     ~~~~~^~~~~~~~~~~~~~~~~
foo.cc:33:14: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   33 |         scanf("%s", a[j]);
      |         ~~~~~^~~~~~~~~~~~

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