/in/foo.cc: In function 'int main()':
/in/foo.cc:13:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   13 |   scanf("%d", &p1[0]);
      |   ~~~~~^~~~~~~~~~~~~~
/in/foo.cc:16:9: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   16 |    scanf("%d", &p1[i]);
      |    ~~~~~^~~~~~~~~~~~~~