foo.cc: In function 'int main()':
foo.cc:79:6: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   79 | scanf("%d%d%d%d",&n,&m,&T,&V);
      | ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
foo.cc:82:6: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   82 | scanf("%d%d%d%d",&q1,&q2,&q3,&q4);
      | ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~

[Hydro](https://hydro.ac)提供评测服务