foo.cc: In function 'int main()':
foo.cc:62:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   62 |     scanf("%d%d%d", &n, &m, &p);
      |     ~~~~~^~~~~~~~~~~~~~~~~~~~~~

[Hydro](https://hydro.ac)提供评测服务