foo.cc: In function 'int main()':
foo.cc:14:9: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result]
  freopen("bus.in","r",stdin);
  ~~~~~~~^~~~~~~~~~~~~~~~~~~~
foo.cc:15:9: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result]
  freopen("bus.out","w",stdout);
  ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~
foo.cc:17:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d %d %d",&n,&m,&k);
  ~~~~~^~~~~~~~~~~~~~~~~~~~~
foo.cc:19:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   scanf("%d",&d[i]);
   ~~~~~^~~~~~~~~~~~
foo.cc:21:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   scanf("%d %d %d",&t[i],&a[i],&b[i]);
   ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

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