foo.cc: In function 'int main()':
foo.cc:9:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
    9 |     scanf("%d%d%d",&n,&na,&nb);
      |     ~~~~~^~~~~~~~~~~~~~~~~~~~~
foo.cc:10:33: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   10 |     for(int i=1;i<=na;i++) scanf("%d",&NA[i]);
      |                            ~~~~~^~~~~~~~~~~~~
foo.cc:11:33: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   11 |     for(int i=1;i<=nb;i++) scanf("%d",&NB[i]);
      |                            ~~~~~^~~~~~~~~~~~~

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