foo.cc: In function 'int main()':
foo.cc:92:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   92 |     scanf("%d",&n);
      |     ~~~~~^~~~~~~~~
foo.cc:96:14: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   96 |         scanf("%d",&ori[i]);
      |         ~~~~~^~~~~~~~~~~~~~
foo.cc:100:14: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  100 |         scanf("%d",&cv[i]);
      |         ~~~~~^~~~~~~~~~~~~
foo.cc:106:18: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  106 |             scanf("%d",&v[i][j]);
      |             ~~~~~^~~~~~~~~~~~~~~

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